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2017-01-16 | Electric field modulation of the non-linear areal magnetic anisotropy energy | We study the ferromagnetic layer thickness dependence of the
voltage-controlled magnetic anisotropy (VCMA) in gated CoFeB/MgO
heterostructures with heavy metal underlayers. When the effective CoFeB
thickness is below ~1 nm, the VCMA efficiency of Ta/CoFeB/MgO heterostructures
considerably decreases with decreasing CoFe... | 1701.04150v1 |
2018-10-01 | Determination of spin Hall angle in heavy metal/CoFeB-based heterostructures with interfacial spin-orbit fields | Magnetization dynamics in W/CoFeB, CoFeB/Pt and W/CoFeB/Pt multilayers was
investigated using spin-orbit-torque ferromagnetic resonance (SOT-FMR)
technique. An analytical model based on magnetization dynamics due to SOT was
used to fit heavy metal (HM) thickness dependence of symmetric and
antisymmetric components of t... | 1810.00641v1 |
2011-07-01 | High frequency magnetic behavior through the magnetoimpedance effect in CoFeB/(Ta, Ag, Cu) multilayered ferromagnetic thin films | We studied the dynamics of magnetization through an investigation of the
magnetoimpedance effect in CoFeB/(Ta, Ag, Cu) multilayered thin films grown by
magnetron sputtering. Impedance measurements were analyzed in terms of the
mechanisms responsible for their variations at different frequency intervals
and the magnetic... | 1107.0204v1 |
2023-01-12 | Cryogenic temperature deposition of high-performance CoFeB/MgO/CoFeB magnetic tunnel junctions on 300 mm wafers | We developed a cryogenic temperature deposition process for high-performance
CoFeB/MgO/CoFeB magnetic tunnel junctions (MTJs) on 300 mm thermally oxidized
silicon wafers. The effect of the deposition temperature of the CoFeB layers on
the nanostructure, magnetic and magneto-transport properties of the MTJs were
investi... | 2301.04823v1 |
2007-02-09 | X-ray photoemission study of CoFeB/MgO thin film bi-layers | We present results from an X-ray photoemission spectroscopy (XPS) study of
CoFeB/MgO bi-layers where we observe process-dependent formation of B, Fe, and
Co oxides at the CoFeB/MgO interface due to oxidation of CoFeB during MgO
deposition. Vacuum annealing reduces the Co and Fe oxides but further
incorporates B into th... | 0702232v1 |
2005-04-03 | Dependence of Giant Tunnel Magnetoresistance of Sputtered CoFeB/MgO/CoFeB Magnetic Tunnel Junctions on MgO Barrier Thickness and Annealing Temperatur | We investigated the dependence of giant tunnel magnetoresistance (TMR) on the
thickness of an MgO barrier and on the annealing temperature of sputtered
CoFeB/MgO/CoFeB magnetic tunnel junctions deposited on SiO2/Si wafers. The
resistance-area product exponentially increases with MgO thickness, indicating
that the quali... | 0504051v1 |
2021-03-30 | Thermal annealing enhancement of Josephson critical currents in ferromagnetic CoFeB | The electrical and structural properties of Co40Fe40B20 (CoFeB) alloy are
tunable with thermal annealing. This is key in the optimization of CoFeB-based
spintronic devices, where the advantageously low magnetic coercivity, high spin
polarization, and controllable magnetocrystalline anisotropy are utilised. So
far, ther... | 2103.16136v1 |
2020-06-22 | Spin-orbit torque induced magnetisation dynamics and switching in CoFeB/Ta/CoFeB system with mixed magnetic anisotropy | Spin-orbit torque (SOT) induced magnetisation switching in CoFeB/Ta/CoFeB
trilayer with two CoFeB layers exhibiting in-plane magnetic anisotropy (IPMA)
and perpendicular magnetic anisotropy (PMA) is investigated. Interlayer
exchange coupling (IEC), measured using ferromagnetic resonance technique is
modified by varying... | 2006.12068v1 |
2023-08-17 | Interfacial Fe segregation and its influence on magnetic properties of CoFeB/MgFeO multilayers | We investigated the effect of Fe segregated from partially Fe-substituted MgO
(MgFeO) on the magnetic properties of CoFeB/MgFeO multilayers. X-ray
photoelectron spectroscopy (XPS) as well as magnetic measurements revealed that
the segregated Fe was reduced to metal and exhibited ferromagnetism at the
CoFeB/MgFeO interf... | 2308.08876v1 |
2012-08-29 | CoFeB Thickness Dependence of Thermal Stability Factor in CoFeB/MgO Perpendicular Magnetic Tunnel Junctions | Thermal stability factor (delta) of recording layer was studied in
perpendicular anisotropy CoFeB/MgO magnetic tunnel junctions (p-MTJs) with
various CoFeB recording layer thicknesses and junction sizes. In all series of
p-MTJs with different thicknesses, delta is virtually independent of the
junction sizes of 48-81 nm... | 1208.5828v1 |
2016-10-24 | Spin orbit effects in CoFeB/MgO hetereostructures with heavy metal underlayers | We study effects originating from the strong spin orbit coupling in CoFeB/MgO
heterostructures with heavy metal (HM) underlayers. The perpendicular magnetic
anisotropy at the CoFeB/MgO interface, the spin Hall angle of the heavy metal
layer, current induced torques and the Dzyaloshinskii-Moriya interaction at the
HM/Co... | 1610.07473v1 |
2014-06-10 | Influence of Ta insertions on the magnetic properties of MgO/CoFeB/MgO films probed by ferromagnetic resonance | We show by vector network analyzer ferromagnetic resonance measurements that
low Gilbert damping {\alpha} down to 0.006 can be achieved in perpendicularly
magnetized MgO/CoFeB/MgO thin films with ultra-thin insertions of Ta in the
CoFeB layer. While increasing the number of Ta insertions allows thicker CoFeB
layers to ... | 1406.2491v2 |
2017-07-11 | Interface Dzyaloshinskii-Moriya interaction in the interlayer exchange antiferromagnetic coupled Pt/CoFeB/Ru/CoFeB systems | Interfacial Dzyaloshinskii-Moriya interaction (iDMI) in interlayer exchange
coupled (IEC) Pt/Co$_{20}$Fe$_{60}$B$_{20}$(1.12
nm)/Ru/Co$_{20}$Fe$_{60}$B$_{20}$(1.12 nm) systems have been studied
theoretically and experimentally. Vibrating sample magnetometer has been used
to measure their magnetization at saturation and... | 1707.03427v1 |
2017-09-21 | Low Gilbert Damping Constant in Perpendicularly Magnetized W/CoFeB/MgO Films with High Thermal Stability | Perpendicular magnetic materials with low damping constant and high thermal
stability have great potential for realizing high-density, non-volatile, and
low-power consumption spintronic devices, which can sustain operation
reliability for high processing temperatures. In this work, we study the
Gilbert damping constant... | 1709.07483v1 |
2018-01-30 | Crystalline structure and XMCD studies of Co40Fe40B20 grown on Bi2Te3, BiTeI and Bi2Se3 | Epitaxial films of Co40Fe40B20 (further - CoFeB) were grown on Bi2Te3(001)
and Bi2Se3(001) substrates by laser molecular beam epitaxy (LMBE) technique at
200-400C. Bcc-type crystalline structure of CoFeB with (111) plane parallel to
(001) plane of Bi2Te3 was observed, in contrast to polycrystalline CoFeB film
formed on... | 1801.10061v1 |
2005-09-28 | Antiferromagnetically coupled CoFeB/Ru/CoFeB trilayers | This work reports on the magnetic interlayer coupling between two amorphous
CoFeB layers, separated by a thin Ru spacer. We observe an antiferromagnetic
coupling which oscillates as a function of the Ru thickness x, with the second
antiferromagnetic maximum found for x=1.0 to 1.1 nm. We have studied the
switching of a ... | 0509749v1 |
2016-12-09 | Influence of intermixing at the Ta/CoFeB interface on spin Hall angle in Ta/CoFeB/MgO heterostructures | We investigate the spin Hall effect in perpendicularly magnetized
Ta/Co40Fe40B20/MgO trilayers with Ta underlayers thicker than the spin
diffusion length. The crystallographic structures of the Ta layer and Ta/CoFeB
interface are examined in detail using X-ray diffraction and transmission
electron microscopy. The thinn... | 1612.03020v1 |
2005-09-28 | Switching of sub-micrometer sized, antiferromagnetically coupled CoFeB/Ru/CoFeB trilayers | This work reports on the magnetic reversal of sub-micrometer sized elements
consisting of an CoFeB/Ru/CoFeB artificial ferrimagnet (AFi). The elements were
patterned into ellipses having a width of approximately 250 to 270nm and a
varying aspect ratio between 1.3 and 8. The coercivity was found to decrease
with an incr... | 0509750v3 |
2006-02-26 | Strong temperature dependence of antiferromagnetic coupling in CoFeB/Ru/CoFeB | The temperature dependence of saturation and spin-flop fields for artificial
ferrimagnets (AFi) based on antiparallel coupled CoFeB/Ru/CoFeB trilayers has
been investigated in a temperature range between 80K and 600K. The results
presented in this paper are relevant for magnetic devices using this system,
e.g. magnetic... | 0602609v2 |
2006-06-20 | Giant tunnel magnetoresistance and high annealing stability in CoFeB/MgO/CoFeB magnetic tunnel junctions with synthetic pinned layer | We investigated the relationship between tunnel magnetoresistance (TMR) ratio
and the crystallization of CoFeB layers through annealing in magnetic tunnel
junctions (MTJs) with MgO barriers that had CoFe/Ru/CoFeB synthetic ferrimagnet
pinned layers with varying Ru spacer thickness (tRu). The TMR ratio increased
with in... | 0606503v1 |
2013-04-17 | Tunneling magneto thermocurrent in CoFeB/MgO/CoFeB based magnetic tunnel junctions | We study the tunneling magneto thermopower and tunneling magneto
thermocurrent of CoFeB/MgO/CoFeB magnetic tunnel junctions (MTJ). The devices
show a clear change of the thermoelectric properties upon reversal of the
magnetisation of the CoFeB layers from parallel to the antiparallel
orientation. When switching from pa... | 1304.4798v1 |
2014-01-18 | Enhancement of Perpendicular Magnetic Anisotropy and Transmission of Spin-Hall-Effect-Induced Spin Currents by a Hf Spacer Layer in W/Hf/CoFeB/MgO Layer | We report that strong perpendicular magnetic anisotropy of the ferromagnetic
layer in a W/CoFeB/MgO multilayer structure can be established by inserting a
Hf layer as thin as 0.25 nm between the W and CoFeB layers. The Hf spacer also
allows transmission of spin currents generated by an in-plane charge current in
the W ... | 1401.4617v1 |
2014-12-12 | Asymmetric spin-wave dispersion due to Dzyaloshinskii-Moriya interaction in an ultrathin Pt/CoFeB film | Employing Brillouin spectroscopy, strong interfacial Dzyaloshinskii-Moriya
interactions have been observed in an ultrathin Pt/CoFeB film. Our
micromagnetic simulations show that spin-wave nonreciprocity due to asymmetric
surface pinning is insignificant for the 0.8nmthick CoFeB film studied. The
observed high asymmetry... | 1412.3907v2 |
2017-04-11 | CoFeAlB alloy with low damping and low magnetization for spin transfer torque switching | We investigate the effect of Al doping on the magnetic properties of the
alloy CoFeB. Comparative measurements of the saturation magnetization, the
Gilbert damping parameter $\alpha$ and the exchange constant as a function of
the annealing temperature for CoFeB and CoFeAlB thin films are presented. Our
results reveal a... | 1704.03326v1 |
2019-02-20 | CoFeB/MgO/CoFeB structures with orthogonal easy axes: perpendicular anisotropy and damping | We report on the Gilbert damping parameter $\alpha$, the effective
magnetization $4\pi M_{eff}$, and the asymmetry of the $g$-factor in
bottom-CoFeB(0.93~nm)/MgO(0.90--1.25~nm)/CoFeB(1.31~nm)-top as-deposited
systems.
Magnetization of CoFeB layers exhibits a specific noncollinear configuration
with orthogonal easy ax... | 1902.07563v1 |
2017-02-17 | Spin-orbit torque in MgO/CoFeB/Ta/CoFeB/MgO symmetric structure with interlayer antiferromagnetic coupling | Spin current generated by spin Hall effect in the heavy metal would diffuse
up and down to adjacent ferromagnetic layers and exert torque on their
magnetization, called spin-orbit torque. Antiferromagnetically coupled
trilayers, namely the so-called synthetic antiferromagnets (SAF), are usually
employed to serve as the... | 1702.05331v1 |
2019-09-27 | Observation of spin-orbit magnetoresistance in CoFeB/heavy metal/MgO with existence of both spin Hall effect and Edelstein effect | In this paper, we report the observation of spin-orbit magnetoresistance
(SOMR) in ferromagnetic metal/heavy metal/MgO system. We measure the
magnetoresistance as the function of the thickness of heavy metal (HM) for
CoFeB/HM/MgO and CoFeB/HM films where HM = Pt and Ta. Besides the conventional
spin Hall magnetoresista... | 1909.12811v3 |
2021-08-11 | Enhancement of in-plane anisotropy in MoS2/CoFeB bilayers | Transition metal dichalcogenides (TMD) possess novel properties which makes
them potential candidates for various spintronic applications. Heterostructures
of TMD with magnetic thin film have been extensively considered for
spin-orbital torque, enhancement of perpendicular magnetic anisotropy etc.
However, the effect o... | 2108.05130v1 |
2023-01-06 | Interfacial magnetic anisotropy controlled spin pumping in Co60Fe20B20/Pt stack | Controlled spin transport in magnetic stacks is required to realize pure spin
current-driven logic and memory devices. The control over the generation and
detection of the pure spin current is achieved by tuning the spin to charge
conversion efficiency of the heavy metal interfacing with ferromagnets. Here,
we demonstr... | 2301.02370v1 |
2023-06-05 | Spin-orbit torque generation in bilayers composed of CoFeB and epitaxial SrIrO$_{3}$ grown on an orthorhombic DyScO$_{3}$ substrate | We report on the highly efficient spin-orbit torque (SOT) generation in
epitaxial SrIrO$_{3}$(SIO), which is grown on an orthorhombic DyScO$_{3}$(110)
substrate. By conducting harmonic Hall measurement in
Co$_{20}$Fe$_{60}$B$_{20}$ (CoFeB)/SIO bilayers, we characterize two kinds of
the SOTs, i.e., dampinglike (DL) and ... | 2306.02567v1 |
2005-09-28 | Magnetic properties of antiferromagnetically coupled CoFeB/Ru/CoFeB | This work reports on the thermal stability of two amorphous CoFeB layers
coupled antiferromagnetically via a thin Ru interlayer. The saturation field of
the artificial ferrimagnet which is determined by the coupling, J, is almost
independent on the annealing temperature up to more than 300 degree C. An
annealing at mor... | 0509753v1 |
2008-12-03 | Correlation between magnetism and spin-dependent transport in CoFeB alloys | We report a correlation between the spin polarization of the tunneling
electrons (TSP) and the magnetic moment of amorphous CoFeB alloys. Such a
correlation is surprising since the TSP involves s-like electrons close to the
Fermi level (EF), while the magnetic moment mainly arises due to all
d-electrons below EF. We sh... | 0812.0679v1 |
2011-10-03 | Spin transfer torque oscillator based on asymmetric magnetic tunnel junctions | We present a study of the spin transfer torque oscillator based on
CoFeB/MgO/CoFeB asymmetric magnetic tunnel junctions. We observe microwave
precession in junctions with different thickness of the free magnetization
layer. Taking advantage of the ferromagnetic interlayer exchange coupling
between the free and referenc... | 1110.0295v1 |
2014-05-11 | Tuning perpendicular magnetic anisotropy in the MgO/CoFeB/Ta thin films | Understanding the magnetic anisotropy at ferromagnetic metal/oxide interface
is a fundamental and intriguing subject. Here we propose an approach to
manipulate the strength of perpendicular magnetic anisotropy (PMA) by varying
MgO thickness in the MgO/CoFeB/Ta thin films. We identify that the PMA at the
MgO/CoFeB inter... | 1405.2551v2 |
2017-12-21 | Exchange-torque-induced excitation of perpendicular standing spin waves in nanometer-thick YIG films | Spin waves in ferrimagnetic yttrium iron garnet (YIG) films with ultralow
magnetic damping are relevant for magnon-based spintronics and low-power
wave-like computing. The excitation frequency of spin waves in YIG is rather
low in weak external magnetic fields because of its small saturation
magnetization, which limits... | 1712.08204v1 |
2020-11-14 | Observation of multi-skyrmion objects created by size and density control in Ta/CoFeB/MgO films | Magnetic skyrmions are chiral spin textures with a nontrivial topology that
offer a potential for future magnetic memory and storage devices. The
controlled formation and adjustment of size and density of magnetic skyrmions
in Ta/CoFeB/MgO trilayers is demonstrated. It is the ideal candidate for the
use as a bottom ele... | 2011.07336v2 |
2020-11-23 | Asymmetric depinning of chiral domain walls in ferromagnetic trilayers | We show that the coupling between two ferromagnetic layers separated by a
nonmagnetic spacer can be used to control the depinning of domain walls and
induce unidirectional domain wall propagation. We investigated CoFeB/Ti/CoFeB
trilayers where the easy axis of the magnetization of the top CoFeB layer is
out-of-plane an... | 2011.11290v1 |
2021-02-16 | Magnonic band structure in CoFeB/Ta/NiFe meander-shaped magnetic bilayers | In this work, we investigate the spin-wave propagation in three-dimensional
nanoscale CoFeB/Ta/NiFe meander structures fabricated on a structured SiO2/Si
substrate. The magnonic band structure has been experimentally determined by
wavevector-resolved Brillouin light scattering (BLS) spectroscopy and a set of
stationary... | 2102.08223v2 |
2016-07-20 | MegaOhm Extraordinary Hall effect in oxidized CoFeB | We report on development of controllably oxidized CoFeB ferromagnetic films
demonstrating the extraordinary Hall effect (EHE) resistivity exceeding 1 Ohmcm
and magnetic field sensitivity up to 10^6 Ohm/T. Such EHE resistivity is four
orders of magnitude higher than previously observed in ferromagnetic materials,
while ... | 1607.05923v1 |
2016-03-28 | Electric-field modulation of exchange stiffness in MgO/CoFeB with perpendicular anisotropy | We observe magnetic domain structures of MgO/CoFeB with a perpendicular
magnetic easy axis under an electric field. The domain structure shows a maze
pattern with electric-field dependent isotropic period. We find that the
electric-field modulation of the period is explained by considering the
electric-field modulation... | 1603.08280v1 |
2006-10-18 | Effect of high annealing temperature on giant tunnel magnetoresistance ratio of CoFeB/MgO/CoFeB magnetic tunnel junctions | We report tunnel magnetoresistance (TMR) ratios as high as 472% at room
temperature and 804% at 5 K in pseudo-spin valve (SV) CoFeB/MgO/CoFeB magnetic
tunnel junctions (MTJs) annealed at 450oC, which is approaching the
theoretically predicted value. By contrast, the TMR ratios for exchange-biased
(EB) SV MTJs with a Mn... | 0610526v1 |
2011-08-24 | Sub-Poissonian shot noise in CoFeB/MgO/CoFeB-based magnetic tunneling junctions | We measured the shot noise in the CoFeB/MgO/CoFeB-based magnetic tunneling
junctions with a high tunneling magnetoresistance ratio (over 200% at 3 K).
Although the Fano factor in the anti-parallel configuration is close to unity,
it is observed to be typically 0.91\pm0.01 in the parallel configuration. It
indicates the... | 1108.4831v1 |
2011-09-27 | Determination of spin-dependent Seebeck coefficients of CoFeB/MgO/CoFeB magnetic tunnel junction nanopillars | We investigate the spin-dependent Seebeck coefficient and the tunneling
magneto thermopower of CoFeB/MgO/CoFeB magnetic tunnel junctions (MTJ) in the
presence of thermal gradients across the MTJ. Thermal gradients are generated
by an electric heater on top of the nanopillars. The thermo power voltage
across the MTJ is ... | 1109.5912v1 |
2013-01-09 | Low-frequency and shot noises in CoFeB/MgO/CoFeB magnetic tunneling junctions | The low-frequency and shot noises in spin-valve CoFeB/MgO/CoFeB magnetic
tunneling junctions were studied at low temperature. The measured 1/f noise
around the magnetic hysteresis loops of the free layer indicates that the main
origin of the 1/f noise is the magnetic fluctuation, which is discussed in
terms of a fluctu... | 1301.2161v1 |
2013-05-31 | Effect of Thermal Annealing on Boron Diffusion, Micro-structural, Electrical and Magnetic properties of Laser Ablated CoFeB Thin Films | We report on Boron diffusion and subsequent crystallization of
Co$_{40}$Fe$_{40}$B$_{20}$ (CoFeB) thin films on SiO$_2$/Si(001) substrate
using pulsed laser deposition. Secondary ion mass spectroscopy reveals Boron
diffusion at the interface in both amorphous and crystalline phase of CoFeB.
High-resolution transmission... | 1305.7335v1 |
2015-03-02 | Exchange bias effect in martensitic epitaxial Ni-Mn-Sn thin films applied to pin CoFeB/MgO/CoFeB magnetic tunnel junctions | The exchange bias effect is commonly used to shift the coercive field of a
ferromagnet. This technique is crucial for the use of magnetic tunnel junctions
as logic or memory devices. Therefore, an independent switching of the two
ferromagnetic electrodes is necessary to guarantee a reliable readout. Here, we
demonstrat... | 1503.00440v2 |
2015-03-12 | Current induced torques in structures with ultra-thin IrMn antiferromagnet | Relativistic current induced torques and devices utilizing antiferromagnets
have been independently considered as two promising new directions in
spintronics research. Here we report electrical measurements of the torques in
structures comprising a $\sim1$~nm thick layer of an antiferromagnet IrMn. The
reduced N\'eel t... | 1503.03729v2 |
2015-09-14 | Thickness-Dependent Magnetoelasticity and its Effects on Perpendicular Magnetic Anisotropy in Ta|CoFeB|MgO Thin Films | We report measurements of the in-plane magnetoelastic coupling in ultra-thin
Ta|CoFeB|MgO layers as a function of uniaxial strain, conducted using a
four-point bending apparatus. For annealed samples, we observe a strong
dependence on the thickness of the CoFeB layer in the range 1.3-2.0 nm, which
can be modeled as ari... | 1509.04134v1 |
2015-10-20 | Evaluation of Spin Waves and Ferromagnetic Resonance Contribution to the Spin Pumping in Ta/CoFeB Structure | The spin waves and ferromagnetic resonance (FMR) contribution to the spin
pumping signal is studied in the Ta/CoFeB interface under different excitation
bias fields. Ferromagnetic resonance is excited utilizing a coplanar waveguide
and a microwave generator. Using a narrow waveguide of about 3 {\mu}m,
magnetostatic sur... | 1510.05745v1 |
2016-10-08 | Perpendicularly magnetized CoFeB multilayers with tunable interlayer exchange for synthetic ferrimagnets | A study of the multilayer system MgO/CoFeB(1.1nm)/Ta($t$)/CoFeB(0.8nm)/MgO is
presented, where the two CoFeB layers are separated by a Ta interlayer of
varying thickness $t$. The magnetization properties deduced from complementary
techniques such as superconducting quantum interference magnetometry,
ferromagnetic reson... | 1610.02550v1 |
2017-01-05 | Excitation and detection of short-waved spin waves in ultrathin Ta/CoFeB/MgO-layer system suitable for spin-orbit-torque magnonics | We report on the excitation and detection of short-waved spin waves with wave
vectors up to about $40\,\mathrm{rad}\,\mu\mathrm{m}^{-1}$ in spin-wave
waveguides made from ultrathin, in-plane magnetized Co$_{8}$Fe$_{72}$B$_{20}$
(CoFeB). The CoFeB is incorporated in a layer stack of Ta/CoFeB/Mgo, a layer
system featurin... | 1701.01399v1 |
2017-01-31 | Lack of correlation between the spin mixing conductance and the ISHE-generated voltages in CoFeB/Pt,Ta bilayers | We investigate spin pumping phenomena in polycrystalline CoFeB/Pt and
CoFeB/Ta bilayers and the correlation between the effective spin mixing
conductance $g^{\uparrow\downarrow}_{\rm eff}$ and the obtained voltages
generated by the spin-to-charge current conversion via the inverse spin Hall
effect in the Pt and Ta laye... | 1701.09110v1 |
2017-03-21 | Influence of magnetic field and ferromagnetic film thickness on domain pattern transfer in multiferroic heterostructures | Domains in BaTiO$_3$ induces a regular modulation of uniaxial magnetic
anisotropy in CoFeB via an inverse magnetostriction effect. As a result, the
domain structures of the CoFeB wedge film and BaTiO$_3$ substrate correlate
fully and straight ferroelectric domain boundaries in BaTiO$_3$ pin magnetic
domain walls in CoF... | 1703.07227v1 |
2018-05-31 | The current-induced spin-orbit torque and field-free switching from Mo-based magnetic heterostructures | Magnetic heterostructure Mo/CoFeB/MgO has strong perpendicular magnetic
anisotropy and thermal stability. Through current-induced hysteresis loop shift
measurements, we show that the dampinglike spin-orbit torque (SOT) efficiency
of Mo/CoFeB/MgO heterostructure is $\xi_{DL}\approx -0.003\pm 0.001$ and fairly
independen... | 1805.12322v3 |
2014-06-08 | Perpendicular magnetic anisotropy and magnetization process in CoFeB/Pd multilayer films | Perpendicular magnetic anisotropy (PMA) and dynamic magnetization reversal
process in [CoFeB $t$ nm/Pd 1.0 nm]$_n$ ($t$ = 0.4, 0.6, 0.8, 1.0, and 1.2 nm;
$n$ = 2 - 20) multilayer films have been studied by means of magnetic
hysteresis and Kerr effect measurements. Strong and controllable PMA with an
effective uniaxial ... | 1406.2028v1 |
2021-01-26 | Voltage-controlled antiferromagnetism in magnetic tunnel junctions | We demonstrate a voltage-controlled exchange bias effect in CoFeB/MgO/CoFeB
magnetic tunnel junctions that is related to the interfacial Fe(Co)Ox formed
between the CoFeB electrodes and the MgO barrier. The unique combination of
interfacial antiferromagnetism, giant tunneling magnetoresistance, and sharp
switching of t... | 2101.11044v1 |
2023-07-27 | Interfacial Resonance States-Induced Negative Tunneling Magneto-resistance in Orthogonally-Magnetized CoFeB/MgO/CoFeB | Magnetic tunneling junctions (MTJs) are essential for non-volatile
magneto-resistive random access memory (MRAM) applications. Here, we report the
observation of a large negative tunneling magneto-resistance (TMR) in the
CoFeB/MgO/CoFeB system with an orthogonally-magnetized configuration. Through
the thickness modulat... | 2307.14807v1 |
2024-01-26 | Efficient Control of Magnetization Dynamics Via W/CuO$_\text{x}$ Interface | Magnetization dynamics, which determine the speed of magnetization switching
and spin information propagation, play a central role in modern spintronics.
Gaining its control will satisfy the different needs of various spintronic
devices. In this work, we demonstrate that the surface oxidized Cu
(CuO$_\text{x}$) can be ... | 2401.14708v1 |
2019-04-23 | Spin injection and pumping generated by a direct current flowing through a magnetic tunnel junction | A charge flow through a magnetic tunnel junction (MTJ) leads to the
generation of a spin-polarized current which exerts a spin-transfer torque
(STT) on the magnetization. When the density of applied direct current exceeds
some critical value, the STT excites high-frequency magnetization precession in
the "free" electro... | 1904.10361v1 |
2016-05-20 | Elementary specific spin and orbital moments of ultrathin CoFeB amorphous films on GaAs(100) | Nanoscale CoFeB amorphous films have been synthesized on GaAs(100) and
studied with X-ray magnetic circular dichroism (XMCD) and transmission electron
microscopy (TEM). We have found that the ratios of the orbital to spin magnetic
moments of both the Co and Fe in the ultrathin amorphous film have been
enhanced by more ... | 1605.06358v1 |
2020-07-24 | Determination of the spin Hall angle, spin mixing conductance and spin diffusion length in Ir/CoFeB for spin-orbitronic devices | Iridium is a very promising material for spintronic applications due to its
interesting magnetic properties such as large RKKY exchange coupling as well as
its large spin-orbit coupling value. Ir is for instance used as a spacer layer
for perpendicular synthetic antiferromagnetic or ferrimagnet systems. However,
only a... | 2007.12413v1 |
2010-06-21 | Magnonic spin-wave modes in CoFeB antidot lattices | In this manuscript time-resolved magneto-optical Kerr effect experiments on
structured CoFeB films are presented. The geometries considered are two
dimensional square lattices of micrometer-sized antidots, fabricated by a
focused ion beam. The spin-wave spectra of these magnonic crystals show a novel
precessional mode,... | 1006.4038v1 |
2012-02-23 | Domain structure in CoFeB thin films with perpendicular magnetic anisotropy | Domain structures in CoFeB-MgO thin films with a perpendicular easy
magnetization axis were observed by magneto-optic Kerr-effect microscopy at
various temperatures. The domain wall surface energy was obtained by analyzing
the spatial period of the stripe domains and fitting established domain models
to the period. In ... | 1202.5128v1 |
2012-08-27 | Spin-wave modes and band structure of rectangular CoFeB antidot lattices | We present an investigation of rectangular antidot lattices in a CoFeB film.
Magnonic band structures are numerically calculated, and band gaps are
predicted which shift in frequency by 0.9 GHz when rotating the external field
from the long to the short axis of the unit cell. We demonstrate by
time-resolved experiments... | 1208.5339v1 |
2013-07-24 | Measurement of magnetization using domain compressibility in CoFeB films with perpendicular anisotropy | We present a method to map the saturation magnetization of soft ultrathin
films with perpendicular anisotropy, and we illustrate it to assess the
compositional dependence of the magnetization of CoFeB(1 nm)/MgO films. The
method relies on the measurement of the dipolar repulsion of parallel domain
walls that define a l... | 1307.6479v1 |
2016-08-08 | Temperature dependence of the spin Hall angle and switching current in the nc-W(O)/CoFeB/MgO system with perpendicular magnetic anisotropy | We investigated the temperature dependence of the switching current for a
perpendicularly magnetized CoFeB film deposited on a nanocrystalline tungsten
film with large oxygen content: nc-W(O). The spin Hall angle
$|\Theta_\mathrm{SH}| \approx 0.22$ is independent of temperature, whereas the
switching current increases ... | 1608.02528v1 |
2017-06-20 | Scaling of the Hall effects beyond the quantum resistance threshold in oxidized CoFeB | The ordinary and the extraordinary Hall effects were studied in gradually
oxidized amorphous CoFeB ferromagnets over six orders of resistivity from the
metallic to the strongly insulating regime. Polarity of the extraordinary Hall
effect reverses, and the amplitude of both the ordinary and the extraordinary
Hall effect... | 1706.06392v1 |
2021-01-28 | Voltage Controlled Spin-Orbit Torque Switching in W/CoFeB/MgO | Voltage control of magnetism and spintronics have been highly desirable, but
rarely realized. In this work, we show voltage-controlled spin-orbit torque
(SOT) switching in W/CoFeB/MgO films with perpendicular magnetic anisotropy
(PMA) with voltage administered through SrTiO3 with a high dielectric constant.
We show tha... | 2101.12281v1 |
2023-11-16 | Unidirectional propagation of zero-momentum magnons | We report on experimental observation of unidirectional propagation of
zero-momentum magnons in synthetic antiferromagnet consisting of strained
CoFeB/Ru/CoFeB trilayer. Inherent non-reciprocity of spin waves in synthetic
antiferromagnets with uniaxial anisotropy results in smooth and monotonous
dispersion relation aro... | 2311.10044v1 |
2014-10-14 | Low frequency noise peak near magnon emission energy in magnetic tunnel junctions | We report on the low frequency (LF) noise measurements in magnetic tunnel
junctions (MTJs) below 4 K and at low bias, where the transport is strongly
affected by scattering with magnons emitted by hot tunnelling electrons, as
thermal activation of magnons from the environment is suppressed. For both
CoFeB/MgO/CoFeB and... | 1410.3586v2 |
2015-05-05 | Large spin Hall magnetoresistance and its correlation to the spin-orbit torque in W/CoFeB/MgO structures | The spin-orbit interaction in heavy metal/ferromagnet/oxide structures has
been extensively investigated because it can be employed in manipulation of the
magnetization direction by in-plane current. This implies the existence of an
inverse effect, in which the conductivity in such structures should depend on
the magne... | 1505.00899v1 |
2020-04-07 | Electrical spin injection into InGaAs/GaAs quantum wells: a comparison between MgO tunnel barriers grown by sputtering and molecular beam epitaxy methods | An efficient electrical spin injection into an InGaAs/GaAs quantum well light
emitting diode is demonstrated thanks to a CoFeB/MgO spin injector. The
textured MgO tunnel barrier is fabricated by two different techniques:
sputtering and molecular beam epitaxy (MBE). The maximal spin injection
efficiency is comparable fo... | 2004.03292v1 |
2020-06-04 | Heisenberg Exchange and Dzyaloshinskii-Moriya Interaction in Ultrathin CoFeB Single and Multilayers | We present results of the analysis of Brillouin Light Scattering (BLS)
measurements of spin waves performed on ultrathin single and multirepeat CoFeB
layers with adjacent heavy metal layers. From a detailed study of the spin-wave
dispersion relation, we independently extract the Heisenberg exchange
interaction (also re... | 2006.02690v1 |
2020-06-25 | Perpendicular magnetic anisotropy and Dzyaloshinskii-Moriya interaction at an oxide/ferromagnetic metal interface | We report on the study of both perpendicular magnetic anisotropy (PMA) and
Dzyaloshinskii-Moriya interaction (DMI) at an oxide/ferromagnetic metal (FM)
interface, i.e. BaTiO3 (BTO)/CoFeB. Thanks to the functional properties of the
BTO film and the capability to precisely control its growth, we are able to
distinguish t... | 2006.14268v1 |
2020-09-29 | Structural Phase Dependent Giant Interfacial Spin Transparency in W/CoFeB Thin Film Heterostructure | Pure spin current has transfigured the energy-efficient spintronic devices
and it has the salient characteristic of transport of the spin angular
momentum. Spin pumping is a potent method to generate pure spin current and for
its increased efficiency high effective spin-mixing conductance (Geff) and
interfacial spin tr... | 2009.14143v1 |
2022-06-10 | Large anomalous unidirectional magnetoresistance in a single ferromagnetic layer | Unidirectional magnetoresistance (UMR) in a ferromagnetic bilayer due to the
spin Hall effects (SHEs) provides a facile means of probing in-plane
magnetization to avoid complex magnetic tunnel junctions. However, the UMR
signal is very weak and usually requires a lock-in amplifier for detection even
in the bilayer invo... | 2206.04851v1 |
2022-06-14 | Probing of large interfacial contribution to spin orbit coupling in CoFeB/Ta heterostructure by ultrafast THz emission spectroscopy | Ultrafast THz radiation generation from ferromagnetic/nonmagnetic bilayer
heterostructure-based spintronic emitters generally exploits the conversion
from spin- to charge-current within the nonmagnetic layer and its interface
with the ferromagnetic layer. Various possible sub-contributions to the
underlying mechanism o... | 2206.06718v2 |
2022-08-31 | Perpendicular magnetic anisotropy in as-deposited CoFeB/MgO thin films | Fabrication of perpendicularly magnetized ferromagnetic films on various
buffer layers, especially on numerous newly discovered spin-orbit torque (SOT)
materials to construct energy-efficient spin-orbitronic devices, is a
long-standing challenge. Even for the widely used CoFeB/MgO structures,
perpendicular magnetic ani... | 2208.14913v1 |
2023-11-20 | Interplay between moment-dependent and field-driven unidirectional magnetoresistance in CoFeB/InSb/CdTe heterostructures | Magnetoresistance effects are crucial for understanding the charge/spin
transport as well as propelling the advancement of spintronic applications.
Here we report the coexistence of magnetic moment-dependent (MD) and magnetic
field-driven (FD) unidirectional magnetoresistance (UMR) effects in
CoFeB/InSb/CdTe heterostru... | 2311.11843v1 |
2024-03-05 | Orbital torque switching in perpendicularly magnetized materials | The orbital Hall effect in light materials has attracted considerable
attention for developing novel orbitronic devices. Here we investigate the
orbital torque efficiency and demonstrate the switching of the perpendicularly
magnetized materials through the orbital Hall material (OHM), i.e., Zirconium
(Zr). The orbital ... | 2403.03043v1 |
2005-10-20 | Dependence of tunnel magnetoresistance in MgO based magnetic tunnel junctions on Ar pressure during MgO sputtering | We investigated dependence of tunnel magnetoresistance effect in
CoFeB/MgO/CoFeB magnetic tunnel junctions on Ar pressure during MgO-barrier
sputtering. Sputter deposition of MgO-barrier at high Ar pressure of 10 mTorr
resulted in smooth surface and highly (001) oriented MgO. Using this MgO as a
tunnel barrier, tunnel ... | 0510531v1 |
2005-10-20 | Current-driven magnetization switching in CoFeB/MgO/CoFeB magnetic tunnel junctions | Current-driven magnetization switching in low-resistance
Co40Fe40B20/MgO/Co40Fe40B20 magnetic tunnel junctions (MTJs) is reported. The
critical-current densities Jc required for current-driven switching in samples
annealed at 270C and 300C are found to be as low as 7.8 x 10^5 A/cm^2 and 8.8 x
10^5 A/cm^2 with accompany... | 0510538v1 |
2006-09-13 | Current-induced magnetization switching in MgO barrier based magnetic tunnel junctions with CoFeB/Ru/CoFeB synthetic ferrimagnetic free layer | We report the intrinsic critical current density (Jc0) in current-induced
magnetization switching and the thermal stability factor (E/kBT, where E, kB,
and T are the energy potential, the Boltzmann constant, and temperature,
respectively) in MgO based magnetic tunnel junctions with a
Co40Fe40B20(2nm)/Ru(0.7-2.4nm)/Co40... | 0609306v2 |
2009-08-15 | Thermal-magnetic noise measurement of spin-torque effects on ferromagnetic resonance in MgO-based magnetic tunnel junctions | Thermal-magnetic noise at ferromagnetic resonance (T-FMR) can be used to
measure magnetic perpendicular anisotropy of nanoscale magnetic tunnel
junctions (MTJs). For this purpose, T-FMR measurements were conducted with an
external magnetic field up to 14 kOe applied perpendicular to the film surface
of MgO-based MTJs u... | 0908.2164v1 |
2011-04-04 | Tunneling magneto thermo power in magnetic tunnel junction nanopillars | We study the tunneling magneto thermo power (TMTP) in CoFeB/MgO/CoFeB
magnetic tunnel junction nanopillars. Thermal gradients across the junctions
are generated by a micropatterned electric heater line. Thermo power voltages
up to a few tens of \muV between the top and bottom contact of the nanopillars
are measured whi... | 1104.0537v2 |
2012-08-28 | Magnetic field sensor with voltage-tunable sensing properties | We report on a magnetic field sensor based on CoFeB/MgO/CoFeB magnetic tunnel
junctions. By taking advantage of the perpendicular magnetic anisotropy of the
CoFeB/MgO interface, the magnetization of the sensing layer is tilted
out-of-plane which results in a linear response to in-plane magnetic fields.
The application ... | 1208.5588v1 |
2013-11-15 | Electric-field-induced strain-mediated magnetoelectric effect in CoFeB-MgO magnetic tunnel junctions | Magnetoelectric coupling between magnetic and electric dipoles is one of the
cornerstones of modern physics towards developing the most energy-efficient
magnetic data storage. Conventionally, magnetoelectric coupling is achieved in
single-phase multiferroics or in magnetoelectric composite nanostructures
consisting of ... | 1311.3794v1 |
2014-04-17 | Large and robust electrical spin injection into GaAs at zero magnetic field using an ultrathin CoFeB/MgO injector | We demonstrate a large electrical spin injection into GaAs at zero magnetic
field thanks to an ultrathin perpendicularly magnetized CoFeB contact of a few
atomic planes (1.2 nm). The spin-polarization of electrons injected into GaAs
was examined by the circular polarization of electroluminescence from a Spin
Light Emit... | 1404.4527v1 |
2014-07-24 | Unambiguous separation of the inverse spin Hall and anomalous Nernst Effects within a ferromagnetic metal using the spin Seebeck effect | The longitudinal spin Seebeck effect is measured on the ferromagnetic
insulator Fe$_3$O$_4$ with the ferromagnetic metal
Co$_{0.2}$Fe$_{0.6}$B$_{0.2}$ (CoFeB) as the spin detector. By using a
non-magnetic spacer material between the two materials (Ti), it is possible to
decouple the two ferromagnetic materials and dire... | 1407.6758v1 |
2015-05-30 | Effect of annealing temperature on exchange stiffness of CoFeB thin films | We investigate the exchange stiffness constants of 28-nm-thick CoFeB film
using Brillouin light scattering. Series of CoFeB films are prepared on the
MgO(001) substrate with or without additional 5-nm thick MgO buffer layer, the
effect of the annealing temperature on the exchange stiffness constants are
studied. We fou... | 1506.00129v1 |
2016-02-08 | Nanomagnetic logic with non-uniform states of clocking | Nanomagnetic logic transmits information along a path of nanomagnets. The
basic mechanism to drive such a transmission, known as clocking, can be
achieved by exploiting the spin-Hall effect, as recently observed in
experiments on Ta/CoFeB/MgO multilayers [D. Bhowmik, et al., Nat. Nano. 9, 59
(2013)]. This paper shows t... | 1602.02528v1 |
2016-04-18 | Temperature dependence of spin-orbit torques in W/CoFeB bilayers | We report on the temperature and layer thickness variation of spin-orbit
torques in perpendicularly magnetized W/CoFeB bilayers. Harmonic Hall voltage
measurements reveal dissimilar temperature evolutions of longitudinal and
transverse effective magnetic field components. The transverse effective field
changes sign at ... | 1604.05204v1 |
2016-04-19 | Probing the Dzyaloshinskii-Moriya interaction in CoFeB ultrathin films using domain wall creep and Brillouin light spectroscopy | We have characterized the strength of the interfacial Dyzaloshinskii-Moriya
interaction (DMI) in ultrathin perpendicularly magnetized CoFeB/MgO films,
grown on different underlayers of W, TaN, and Hf, using two experimental
methods. First, we determined the effective DMI field from measurements of
field-driven domain w... | 1604.05475v1 |
2018-01-17 | Interference induced enhancement of magneto-optical Kerr effect in ultrathin magnetic films | We have studied the magneto-optical spectra of ultrathin magnetic films
deposited on Si substrates coated with an oxide layer (SiOx). We find that the
Kerr rotation angle and the ellipticity of ~1 nm thick CoFeB thin films, almost
transparent to visible light, show a strong dependence on the thickness of the
SiOx layer... | 1801.05539v1 |
2018-03-19 | Enhanced spin-orbit torque via interface engineering in Pt/CoFeB/MgO heterostructures | Spin-orbit torque facilitates efficient magnetization switching via an
in-plane current in perpendicularly magnetized heavy metal/ferromagnet
heterostructures. The efficiency of spin-orbit-torque-induced switching is
determined by the charge-to-spin conversion arising from either bulk or
interfacial spin-orbit interact... | 1803.06961v1 |
2019-11-28 | Spin-torque memristors based on perpendicular magnetic tunnel junctions with a hybrid chiral texture | Spin-torque memristors were proposed in 2009, which could provide fast,
low-power and infinite memristive behavior for large-density non-volatile
memory and neuromorphic computing. However, the strict requirements of
combining high magnetoresistance, stable intermediate states and spin-polarized
current switching in a ... | 1911.12784v1 |
2017-05-29 | Contributions of Co and Fe orbitals to Perpendicular Magnetic Anisotropy of MgO/CoFeB Bilayers with Spin-Orbit-Torque-Related (Ta, W, IrMn, and Ti) Underlayers | We study the perpendicular magnetic anisotropy (PMA) of the CoFeB/MgO
bilayers in contact with W, Ta, IrMn and Ti which has been suggested as the
spin-orbit-torque-related underlayers. The saturation magnetization of the
CoFeB depends on the underlayer materials due to formation of a dead-layer,
affecting PMA strength ... | 1705.10064v1 |
2019-10-30 | Ultra-low switching current density in all-amorphous W-Hf / CoFeB / TaOx films | We study current-induced deterministic magnetization switching and domain
wall motion via polar Kerr microscopy in all-amorphous
W$_{66}$Hf$_{34}$/CoFeB/TaO$_\text{x}$ with perpendicular magnetic anisotropy
and large spin Hall angle. Investigations of magnetization switching as a
function of in-plane assist field and c... | 1910.13837v3 |
2018-12-05 | Voltage-induced strain clocking of nanomagnets with perpendicular magnetic anisotropies | Nanomagnetic logic (NML) has attracted attention during the last two decades
due to its promise of high energy efficiency combined with non-volatility. Data
transmission in NML relies on Bennett clocking through dipole interaction
between neighboring nanomagnetic bits. This paper uses a fully coupled finite
element mod... | 1812.02268v1 |
2018-12-18 | Enhancement of Spintronic Terahertz Emission via Annealing in Ferromagnetic Heterostructures | We systematically investigate the influence of annealing effect on terahertz
(THz) generation from CoFeB based magnetic nanofilms driven by femtosecond
laser pulses. Three times enhancement of THz yields are achieved in W/CoFeB
through annealing effect, and double boosting is obtained in Pt/CoFeB. The
mechanism of anne... | 1812.07113v2 |
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