publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2002-03-07 | Resonant x-ray emission spectra of Mn based Heusler alloys | The Mn L_2,L_3 x-ray spectra of the Cu_2MnAl and Co_2MnZ (Z=Al,Ga, Sn, Sb)
Heusler alloys have been investigated by the Resonant X-ray Emission
Spectroscopy (RXES) using linearly polarized monochromatic synchrotron
radiation for. The interplay between the half-metallic character of the Mn 3d
electronic structure in con... | 0203169v1 |
2002-09-25 | Magnetic properties of Ni2.18Mn0.82Ga Heusler alloys with a coupled magnetostructural transition | Polycrystalline Ni2.18Mn0.82Ga Heusler alloys with a coupled
magnetostructural transition are studied by differential scanning calorimetry,
magnetic and resistivity measurements. Coupling of the magnetic and structural
subsystems results in unusual magnetic features of the alloy. These uncommon
magnetic properties of N... | 0209574v1 |
2004-06-24 | Electronic Structure and Magnetic Exchange Coupling in Ferromagnetic Full Heusler Alloys | Density-functional studies of the electronic structures and exchange
interaction parameters have been performed for a series of ferromagnetic full
Heusler alloys of general formula Co$_2$MnZ (Z = Ga, Si, Ge, Sn), Rh$_2$MnZ (Z
= Ge, Sn, Pb), Ni$_2$MnSn, Cu$_2$MnSn and Pd$_2$MnSn, and the connection
between the electroni... | 0406588v1 |
2004-08-03 | Half-metallicity and Slater-Pauling behavior in the ferromagnetic Heusler alloys | Introductory chapter for the book "Halfmetallic Alloys - Fundamentals and
Applications" to be published in the series Springer Lecture Notes on Physics,
P. H. Dederichs and I. Galanakis (eds). It contains a review of the theoretical
work on the half-metallic Heusler alloys. | 0408068v1 |
2006-03-23 | Inverted spin polarization of Heusler alloys for new spintronic devices | A new magnetic logic overcomes the major limitations of field programmable
gate arrays while having a 50% smaller unit cell than conventional designs
utilizing magnetic tunnel junctions with one Heusler alloy electrode. These
show positive and negative TMR values at different bias voltages at room
temperature which gen... | 0603616v1 |
2006-03-30 | Effect of doping and disorder on the half-metallicity of full Heusler alloy | Heusler alloys containing Co and Mn are amongst the most heavily studied
half-metallic ferromagnets for future applications in spintronics. Using
state-of-the-art electronic structure calculations, we investigate the effect
of doping and disorder on their electronic and magnetic properties. Small
degrees of doping by s... | 0603811v1 |
2006-09-20 | Towards a full Heusler alloy showing room temperature half-metallicity at the surface | In this article we investigate the surface spin polarization in a 100 nm
Co2Cr0.6Fe0.4Al (CCFA) film grown ex situ epitaxially on MgO(100) with a 10 nm
Fe buffer layer by means of spin resolved photoemission. We show that a careful
in situ preparation of the sample surface leads to values for the room
temperature spin ... | 0609504v1 |
1995-03-28 | THE UNIQUENESS THEOREM FOR ROTATING BLACK HOLE SOLUTIONS OF SELF-GRAVITATING HARMONIC MAPPINGS | We consider rotating black hole configurations of self-gravitating maps from
spacetime into arbitrary Riemannian manifolds. We first establish the
integrability conditions for the Killing fields generating the stationary and
the axisymmetric isometry (circularity theorem). Restricting ourselves to
mappings with harmoni... | 9503053v1 |
1995-06-15 | Pulsation of Spherically Symmetric Systems in General Relativity | The pulsation equations for spherically symmetric black hole and soliton
solutions are brought into a standard form. The formulae apply to a large class
of field theoretical matter models and can easily be worked out for specific
examples. The close relation to the energy principle in terms of the second
variation of t... | 9506027v1 |
1996-10-11 | No-Hair Theorems and Black Holes with Hair | The critical steps leading to the uniqueness theorem for the Kerr-Newman
metric are reexamined in the light of the new black hole solutions with
Yang-Mills and scalar hair. Various methods -- including scaling techniques,
arguments based on energy conditions, conformal transformations and divergence
identities -- are r... | 9610019v1 |
1997-03-06 | Mass formulae for a class of nonrotating black holes | In the presence of a Killing symmetry, various self-gravitating field
theories with massless scalars (moduli) and vector fields reduce to
sigma-models, effectively coupled to 3-dimensional gravity. We argue that this
particular structure of the Einstein-matter equations gives rise to quadratic
relations between the asy... | 9703015v1 |
1998-05-15 | On rotational excitations and axial deformations of BPS monopoles and Julia-Zee dyons | It is shown that Julia-Zee dyons do not admit slowly rotating excitations.
This is achieved by investigating the complete set of stationary excitations
which can give rise to non-vanishing angular momentum. The relevant zero modes
are parametrized in a gauge invariant way and analyzed by means of a harmonic
decompositi... | 9805061v1 |
2001-05-22 | Semiclassical evidence for the BGS-conjecture | Recently, M. Sieber and K. Richter achieved a breakthrough towards a proof of
the BGS-conjecture by calculating semiclassically a first correction to the
diagonal approximation of the orthogonal form factor for geodesic flow on a
Riemann surface of constant negative curvature. In this note, we try to
generalize the arg... | 0105052v3 |
2001-06-22 | Near action degeneracy of periodic orbits in systems with non-conventional time reversal | Recently, Sieber and Richter calculated semiclassically a first off-diagonal
contribution to the orthogonal form factor for a billiard on a surface of
constant negative curvature by considering orbit pairs having almost the same
action. For a generalization of this derivation to systems invariant under
non-conventional... | 0106035v1 |
2007-11-05 | Magnetization easy-axis in martensitic Heusler alloys estimated by strain measurements under magnetic-field | We study the temperature dependence of strain under constant magnetic-fields
in Ni-Mn based ferromagnetic Heusler alloys in the form Ni-Mn-$X$ ($X$: Ga, In,
Sn, Sb) which undergo a martensitic transformation. We discuss the influence of
the applied magnetic-field on the nucleation of ferromagnetic martensite and
extrac... | 0711.0639v1 |
2011-02-18 | Perpendicular magnetic anisotropy of full-Heusler films in Pt/Co2FeAl/MgO trilayers | We report on perpendicular magnetic anisotropy (PMA) in a Pt/Co2FeAl/MgO
sandwiched structure with a thick Co2FeAl layer of 2-2.5 nm. The PMA is
thermally stable that the anisotropy energy density Ku is 1.3{\times}106
erg/cm3 for the structure with 2 nm Co2FeAl after annealing at 350 oC. The
thicknesses of Co2FeAl and ... | 1102.3802v1 |
2012-06-06 | Probing the superconducting state of the Heusler supercoductor: ZrNi$_2$Ga | Using both muon spin rotation and muon spin relaxation, the superconducting
ground state of the Heusler superconductor {ZrNi$_2$Ga} has been studied. The
temperature dependence of the magnetic penetration depth of {ZrNi$_2$Ga} is
consistent with a single isotropic gap s-wave BCS superconductor. The gap
energy is \Delta... | 1206.1182v1 |
2015-01-03 | First-principles study of four quaternary Heusler alloys ZrMnVZ and ZrCoFeZ (Z=Si, Ge) | We investigate the electronic structure and magnetic properties of four
quaternary Heusler alloys ZrMnVZ and ZrCoFeZ (Z=Si, Ge) by using
first-principle calculations. It is shown that ZrMnVSi, ZrMnVGe and ZrCoFeSi
are half-metallic ferromagnets with considerable half-metallic gaps of 0.14,
0.18 and 0.22 eV, respectivel... | 1501.00542v1 |
2018-03-30 | Boosting Material Modeling Using Game Tree Search | We demonstrate a heuristic optimization algorithm based on the game tree
search for multi-component materials design. The algorithm searches for the
largest spin polarization of seven-component Heusler alloys. The algorithm can
find the peaks quickly and is more robust against local optima than Bayesian
optimization ap... | 1803.11338v2 |
2018-06-18 | Large anomalous Nernst effect across the magneto-structural transition in bulk Ni-Co-Mn-Sn full Heusler alloy | We report on the observation of temperature and field dependent anomalous
Nernst effect (ANE) in Ni-rich bulk Ni-Co-Mn-Sn full Heusler alloy. A large
change in the transverse Nernst coefficient (N) is obtained across the first
order magnetostructural transition from a tetragonal martensite to a cubic
austenite phase. T... | 1806.06675v1 |
2018-11-09 | Anomaly in anomalous Nernst effect at low temperature for C1b-type NiMnSb half-Heusler alloy thin film | The anomaly in the anomalous Nernst effect (ANE) was observed for a C1b-type
NiMnSb half-Heusler alloy thin film deposited on a MgO (001) substrate. The
Nernst angle ({\theta}ANE) showed maximum peak with decreasing temperature and
reached 0.15 at 80 K, which is considered to be brought by the cross-over from
half-meta... | 1811.03791v1 |
2020-01-17 | Fermi Level Controlled Ultrafast Demagnetization Mechanism in Half-Metallic Heusler Alloy | The electronic band structure-controlled ultrafast demagnetization mechanism
in Co2FexMn1-xSi Heusler alloy is underpinned by systematic variation of
composition. We find the spin-flip scattering rate controlled by spin density
of states at Fermi level is responsible for non-monotonic variation of
ultrafast demagnetiza... | 2001.06217v1 |
2022-01-14 | Antisite disorder and phase segregation in Mn$_{2}$NiSn | A systematic study of crystal structure, local structure, magnetic and
transport properties in quenched and temper annealed Ni$_{2-x}$Mn$_{1+x}$Sn
alloys indicate the formation of Mn$_3$Sn type structural defects caused by an
antisite disorder between Mn and Sn occupying the Y and Z sublattices of
X$_2$YZ Heusler struc... | 2201.05283v1 |
2022-12-19 | Chiral surface superconductivity in half-Heusler semimetals | We propose the metallic and weakly dispersive surface states of half-Heusler
semimetals as a possible domain for the onset of unconventional surface
superconductivity ahead of the bulk transition. Using density functional theory
(DFT) calculations and the random phase approximation (RPA), we analyse the
surface band st... | 2212.09786v1 |
2023-02-13 | Half-metallicity in $Ni_2XMn$ Heusler alloys ($X=Fe,Co,Cr$): ab-initio calculations | Lattice parameter, bulk modulus, formation energy and magnetism equilibrium
structure in all-d transition metals $Ni_2XMn$ (X=Co,Cr,Fe) for Full and
Inverse Heusler structure are studied by first-principles calculations.
Tetragonal distortion is calculated for the equilibrium volume of each alloy
and possible new equil... | 2302.06450v1 |
2007-12-02 | Role of the conduction electrons in mediating exchange interactions in Heusler alloys | Because of large spatial separation of the Mn atoms in Heusler alloys the Mn
3d states belonging to different atoms do not overlap considerably. Therefore
an indirect exchange interaction between Mn atoms should play a crucial role in
the ferromagnetism of the systems. To study the nature of the ferromagnetism of
vario... | 0712.0158v1 |
2012-12-01 | On the half-metallicity of Co2FeSi Heusler alloy: an experimental and ab initio study | Co2FeSi, a Heusler alloy with the highest magnetic moment per unit cell and
the highest Curie temperature, has largely been described theoretically as a
half-metal. This conclusion, however, disagrees with Point Contact Andreev
Reflection (PCAR) spectroscopy measurements, which give much lower values of
spin polarizati... | 1212.0168v1 |
2013-01-27 | Spintronic properties and stability of the half-Heusler alloys LiMnZ (Z=N, P, Si) | Li-based half-Heusler alloys have attracted much attention due to their
potential applications in optoelectronics and because they carry the
possibility of exhibiting large magnetic moments for spintronic applications.
Due to their similarities to metastable zinc blende half-metals, the
half-Heusler alloys $\beta$-LiMn... | 1301.6367v3 |
2016-04-26 | First principles studies of the Gilbert damping and exchange interactions for half-metallic Heuslers alloys | Heusler alloys have been intensively studied due to the wide variety of
properties that they exhibit. One of these properties is of particular interest
for technological applications, i.e. the fact that some Heusler alloys are
half-metallic. In the following, a systematic study of the magnetic properties
of three diffe... | 1604.07552v1 |
2018-01-09 | Epitaxial Heusler Superlattice Co2MnAl/Fe2MnAl with Perpendicular Magnetic Anisotropy and Termination-Dependent Half-Metallicity | Single-crystal Heusler atomic-scale superlattices that have been predicted to
exhibit perpendicular magnetic anisotropy and half-metallicity have been
successfully grown by molecular beam epitaxy. Superlattices consisting of
full-Heusler Co$_2$MnAl and Fe$_2$MnAl with one to three unit cell periodicity
were grown on Ga... | 1801.02787v1 |
2019-02-20 | Spin-charge conversion in NiMnSb Heusler alloy films | Half-metallic Heusler alloys are attracting considerable attention because of
their unique half-metallic band structures which exhibit high spin polarization
and yield huge magnetoresistance ratios. Besides serving as ferromagnetic
electrodes, Heusler alloys also have the potential to host spin-charge
conversion which ... | 1902.07406v1 |
2020-02-11 | A simple model for vacancy order and disorder in defective half-Heusler systems | Defective half-Heusler systems X(1-x)YZ with large amounts of intrinsic
vacancies, such as Nb(1-x)CoSb, Ti(1-x)NiSb and V(1-x)CoSb, are a group of
promising thermoelectric materials. Even with high vacancy concentrations they
maintain the average half-Heusler crystal structure. These systems show high
electrical conduc... | 2002.04281v2 |
2021-02-22 | Structural, magnetic, and magnetocaloric properties of Fe2CoAl Heusler nanoalloy | Spherical nanoparticles (NPs) of size 14 nm, made of intermetallic Fe2CoAl
(FCA) Heusler alloy, are synthesized via the co-precipitation and thermal
deoxidization method. X-ray diffraction (XRD) and selected area electron
diffraction (SAED) patterns confirm that the present nanoalloy is crystallized
in A2-disordered cu... | 2102.11195v2 |
2022-12-02 | FeRhCrSi: A new spin semimetal with room temperature spin-valve behavior | Spin semimetals are a recently discovered new class of spintronic materials,
which exhibit a band gap in one spin channel while a semimetallic feature in
the other and thus allows for tunable spin transport. Here, we present
experimental verification of spin semimetallic behavior in FeRhCrSi, a
quaternary Heusler alloy... | 2212.00924v2 |
2023-03-17 | Intrinsic and extrinsic anomalous transport properties of Heusler ferromagnets Fe$_2$CoAl and Fe$_2$NiAl from first principles | Recently, Heusler ferromagnets have been found to exhibit unconventional
anomalous electric, thermal, and thermoelectric transport properties. In this
study, we employed first-principles density functional theory calculations to
systematically investigate both intrinsic and extrinsic contributions to the
anomalous Hall... | 2303.09812v2 |
2023-10-24 | Tuning the topological character of half-Heusler systems: A comparative study on Y$T$Bi ($T$ = Pd, Pt) | Half-Heusler systems host a plethora of different ground states, especially
with non-trivial topology. However, there is still a lack of spectroscopic
insight into the corresponding band inversion in this family. In this work, we
locally explore the half-Heuslers Y$T$Bi ($T =$ Pt and Pd) by means of scanning
tunneling ... | 2310.15708v1 |
2006-11-17 | Electronic structure of half-metallic magnets | We have analyzed the electronic structure of half-metallic magnets based on
first principles electronic structure calculations of a series of semi-Heusler
alloys. The characteristic feature of the electronic structure of semi-Heusler
systems is a d-d gap in the density of states lying at/close to the Fermi level
depend... | 0611476v1 |
2008-11-10 | Tuning the magnetic properties of half-metallic semi-Heusler alloys by sp-electron substitution: The case of AuMnSn$_{1-x}$Sb$_x$ quaternary alloys | We study the electronic and magnetic properties of the quaternary
AuMnSn$_{1-x}$Sb$_{x}$ Heusler alloys using first principles calculations. We
determine their magnetic phase diagram and we show that they present a phase
transition from a ferromagnetic to an antiferromagnetic state with increasing
Sb concentration. For... | 0811.1408v1 |
2009-02-09 | Analysis of L21-ordering in full-Heusler Co2FeSi alloy thin films formed by rapid thermal annealing | The authors developed a new analysis approach for evaluation of atomic
ordering in full-Heusler alloys, which is extension of the commonly used
Webster model. Our model can give accurate physical formalism for the degree of
atomic ordering in the L21 structure, including correction with respect to the
fully disordered ... | 0902.1438v1 |
2009-06-16 | Epitaxial Growth of a Full-Heusler Alloy Co$_{2}$FeSi on Silicon by Low-Temperature Molecular Beam Epitaxy | For electrical spin injection and detection of spin-polarized electrons in
silicon, we explore highly epitaxial growth of ferromagnetic full-Heusler-alloy
Co2FeSi thin films on silicon substrates using low-temperature molecular beam
epitaxy (LTMBE). Although in-situ reflection high energy electron diffraction
images cl... | 0906.2840v1 |
2009-10-26 | Direct determination of the surface termination in full Heusler alloys by means of low energy electron diffraction | The performance of Heusler based magnetoresistive multilayer devices depends
crucially on the spin polarization and thus on the structural details of the
involved surfaces. Using low energy electron diffraction (LEED), one can
non-destructively distinguish between important surface terminations of Co2XY
full-Heusler al... | 0910.4909v2 |
2010-06-01 | Observation of enhanced exchange bias behavior in NiCoMnSb Heusler alloys | We report the observation of large exchange bias in Ni50-xCoxMn38Sb12 Heusler
alloys with x=0, 2, 3, 4, 5, which is attributed to the coexistence of
ferromagnetic and antiferromagnetic phases in the martensitic phase. The phase
coexistence is possibly due to the supercooling of the high temperature
ferromagnetic phase ... | 1006.0071v1 |
2012-06-11 | Crossover from antiferromagnetic to ferromagnetic ordering in semi-Heusler alloys Cu1-xNixMnSb with increasing Ni concentration | The magnetic properties and transition from an antiferromagnetic (AFM) to a
ferromagnetic (FM) state in semi Heusler alloys Cu1-xNixMnSb, with x < 0.3 have
been investigated in details by dc magnetization, neutron diffraction, and
neutron depolarization. We observe that for x < 0.05, the system Cu1-xNixMnSb
is mainly i... | 1206.2243v1 |
2012-11-02 | Interface characterization of Co2MnGe/Rh2CuSn Heusler multilayers | All-Heusler multilayer structures have been investigated by means of high
kinetic x-ray photoelectron spectroscopy and x-ray magnetic circular dichroism,
aiming to address the amount of disorder and interface diffusion induced by
annealing of the multilayer structure. The studied multilayers consist of
ferromagnetic Co... | 1211.0489v2 |
2013-04-09 | Half-metallicity and anisotropy magnetoresistance properties of Heusler alloys Fe2Co1-xCrxSi | In this paper, we investigate the half-metallicity of Heusler alloys
Fe2Co1-xCrxSi by first principles calculations and anisotropy magnetoresistance
measurements. It is found that, with the increase of Cr content x, the Fermi
level of Fe2Co1-xCrxSi moves from the top of valence band to the bottom of
conduction band, an... | 1304.2602v1 |
2013-07-11 | Large Linear Magnetoresistance and Shubnikov-de Hass Oscillations in Single Crystals of YPdBi Heusler Topological Insulators | We report the observation of a large linear magnetoresistance (MR) and
Shubnikov-de Hass (SdH) quantum oscillations in single crystals of YPdBi
Heusler topological insulators. Owning to the successfully obtained the
high-quality YPdBi single crystals, large non-saturating linear MR of as high
as 350% at 5K and over 120... | 1307.3022v1 |
2013-11-22 | Full-Heusler Co2FeSi alloy thin films with perpendicular magnetic anisotropy induced by MgO-interface | The authors demonstrated that L21-ordered full-Heusler Co2FeSi (CFS) alloy
film with thickness of 100 nm were formed by facing targets sputtering (FTS)
method at a substrate temperature TS = 300 deg C. Degrees of L21- and B2- order
for the film were 0.37, and 0.96, respectively. Furthermore, full-Heusler CFS
alloy thin... | 1311.5670v2 |
2014-02-18 | Interplay of growth mode and thermally induced spin accumulation in epitaxial Al/Co$_2$TiSi/Al and Al/Co$_2$TiGe/Al contacts | The feasibility of thermally driven spin injectors built from half-metallic
Heusler alloys inserted between aluminum leads was investigated by means of
{\em ab initio} calculations of the thermodynamic equilibrium and electronic
transport. We have focused on two main issues and found that: (i) the interface
between Al ... | 1402.4396v2 |
2014-10-07 | Anti-site disorder and improved functionality of Mn$_{2}$Ni{\it X} ({\it X}= Al, Ga, In, Sn) inverse Heusler alloys | Recent first-principles calculations have predicted Mn$_{2}$Ni{\it X} ({\it
X}=Al, Ga, In, Sn) alloys to be magnetic shape memory alloys. Moreover,
experiments on Mn$_{2}$NiGa and Mn$_{2}$NiSn suggest that the alloys deviate
from the perfect inverse Heusler arrangement and that there is chemical
disorder at the sublatt... | 1410.1690v1 |
2014-11-27 | $Ab$ $intito$ study on some new spin-gapless semiconductors: The Zr-based quanternary Heusler alloys | Employing $ab$ $intito$ electronic structure calculations, we have
investigated electronic and magnetic properties of the Zr-based quanternary
Heusler alloys: ZrCoVIn, ZrFeVGe, ZrCoFeP, ZrCoCrBe and ZrFeCrZ (Z=In and Ga).
Our $ab$ $intito$ calculation results show that all the alloys are (or nearly)
spin-gapless semico... | 1411.7570v2 |
2015-06-22 | Two successive magneto-structural transformations and their relation to enhanced magnetocaloric effect for Ni55.3Mn19.7Ga25 Heusler alloy | In the present work, two successive magneto-structural transformations (MSTs)
consisting of martensitic and intermartensitic transitions have been reported
in polycrystalline Ni55.8Mn18.1Ga26.1 Heusler alloy. Benefiting from the
additional latent heat contributed from intermediate phase, this alloy exhibits
a large tra... | 1506.06517v2 |
2015-08-07 | Multifunctional Heusler alloy: experimental evidences of enhanced magnetocaloric properties at room temperature and half-metallicity | Heusler alloys are widely studied due to their interesting structural and
magnetic properties, like magnetic memory shape ability, coupled
magneto-structural phase transitions and half-metallicity; ruled, for many
cases, by the valence electrons number ($N_v$). The present work focuses on the
magnetocaloric potentials ... | 1508.01828v1 |
2016-04-19 | Half Heusler Alloys for Efficient Thermoelectric Power Conversion | Half-Heusler (HH) phases (space group F43m, Clb) are increasingly gaining
attention as promising thermoelectric materials in view of their thermal
stability, scalability, and environmental benignity as well as efficient power
output. Until recently, the verifiable dimensionless figure of merit (ZT) of HH
phases has rem... | 1604.05397v2 |
2019-11-22 | Superconducting spin-valve effect in heterostructures with ferromagnetic Heusler alloy layers | We report a comparative analysis and theoretical description of the
superconducting properties of two spin-valve-valve structures containing the
Heusler alloy Co$_2$Cr$_{1-x}$Fe$_x$Al$_{y}$ as one of two ferromagnetic (F1 or
F2) layers of the F1/F2/S structure, where S stands for the superconducting Pb
layer. In our ex... | 1911.09984v1 |
2017-04-04 | Model Hamiltonian and Time Reversal Breaking Topological Phases of Anti-ferromagnetic Half-Heusler Materials | In this work, we construct a generalized Kane model with a new coupling term
between itinerant electron spins and local magnetic moments of
anti-ferromagnetic ordering in order to describe the low energy effective
physics in a large family of anti-ferromagnetic half-Heusler materials.
Topological properties of this gen... | 1704.01138v1 |
2017-05-17 | High Thermoelectric Figure of Merit by Resonant Dopant in Half-Heusler Alloys | Half-Heusler alloys have been one of the benchmark high temperature
thermoelectric materials owing to their thermal stability and promising figure
of merit ZT. Simonson et al. early showed that small amounts of vanadium doped
in Hf0.75Zr0.25NiSn enhanced the Seebeck coefficient and correlated the change
with the increa... | 1705.06100v1 |
2018-07-17 | Ferromagnetically correlated clusters in semi-metallic Ru2NbAl Heusler alloy | In this work, we report the structural, magnetic and electrical and thermal
transport properties of the Heusler-type alloy Ru2NbAl. From the detailed
analysis of magnetization data, we infer the presence of superparamagnetically
interacting clusters with a Pauli paramagnetic background, while short-range
ferromagnetic ... | 1807.06608v1 |
2019-01-27 | Computational search for ultrasmall and fast skyrmions in the Inverse Heusler family | Skyrmions are magnetic excitations that are potentially ultrasmall and
topologically protected, making them interesting for high-density
all-electronic ultrafast storage applications. While recent experiments have
confirmed the existence of various types of skyrmions, their typical sizes are
much larger than traditiona... | 1901.09446v1 |
2019-04-03 | Observation of Topological Hall Effect and Signature of Room Temperature Antiskyrmions in Mn-Ni-Ga D2d Heusler magnets | Topologically stable nontrivial spin structures, such as skyrmions and
antiskyrmions, display a large topological Hall effect owing to their quantized
topological charge. Here, we present the finding of a large topological Hall
effect beyond room temperature in the tetragonal phase of a Mn-Ni-Ga based
ferrimagnetic Heu... | 1904.01894v1 |
2019-04-25 | Low damping magnetic properties and perpendicular magnetic anisotropy with strong volume contribution in the Heusler alloy Fe1.5CoGe | We present a study of the dynamic magnetic properties of TiN-buffered
epitaxial thin films of the Heusler alloy Fe$_{1.5}$CoGe. Thickness series
annealed at different temperatures are prepared and the magnetic damping is
measured, a lowest value of $\alpha=2.18\times 10^{-3}$ is obtained. The
perpendicular magnetic ani... | 1904.11247v1 |
2018-02-17 | FeTaSb and FeMnTiSb as promising thermoelectric materials: An ab initio approach | Thermoelectricity in principle provides a pathway to put waste heat to good
use. Motivated by this we investigate thermal and electrical transport
properties of two new Fe-based Heusler alloys, FeTaSb and FeMnTiSb, by a first
principles approach and semiclassical Boltzmann transport theory within the
constant relaxatio... | 1802.06254v1 |
2018-12-13 | Current-induced nucleation and dynamics of skyrmions in a Co-based Heusler alloy | We demonstrate room-temperature stabilization of dipolar magnetic skyrmions
with diameters in the range of $100$ nm in a single ultrathin layer of the
Heusler alloy Co$_2$FeAl (CFA) under moderate magnetic fields. Current-induced
skyrmion dynamics in microwires is studied with a scanning Nitrogen-Vacancy
magnetometer o... | 1812.05345v1 |
2020-04-03 | Improved magnetostructural and magnetocaloric reversibility in magnetic Ni-Mn-In shape-memory Heusler alloy by optimizing the geometric compatibility condition | We report an improved reversibility of magnetostriction and inverse
magnetocaloric effect (MCE) for the magnetic shape-memory Heusler alloy
Ni$_{1.8}$Mn$_{1.8}$In$_{0.4}$. We show that the magnetostriction and MCE
crucially depends on the geometrical compatibility of the austenite and
martensite phases. Detailed inform... | 2004.01527v1 |
2020-08-17 | Interaction between skyrmions and antiskyrmions in a coexisting phase of a Heusler material | Coexisting phases of magnetic skyrmions and antiskyrmions have proposed to
exhibit a variety of fascinating properties, owing to interactions between
them. The recent discovery of the coexisting phase in a Heusler material could
offer a platform for skyrmion-antiskyrmion-based spintronics. Here we report
Lorentz electr... | 2008.07272v2 |
2016-03-10 | Pairing of j=3/2 fermions in half-Heusler superconductors | We theoretically consider the superconductivity of the topological
half-Heusler semimetals YPtBi and LuPtBi. We show that pairing occurs between
j=3/2 fermion states, which leads to qualitative differences from the
conventional theory of pairing between j=1/2 states. In particular, this
permits Cooper pairs with quinte... | 1603.03376v3 |
2016-03-27 | Thermoelectric properties of half-Heusler $\mathrm{ZrNiPb}$ by using first principles calculations | We investigate electronic structures and thermoelectric properties of recent
synthetic half-Heusler $\mathrm{ZrNiPb}$ by using generalized gradient
approximation (GGA) and GGA plus spin-orbit coupling (GGA+SOC). Calculated
results show that $\mathrm{ZrNiPb}$ is a indirect-gap semiconductor. Within the
constant scatteri... | 1603.08203v1 |
2016-03-28 | Ab initio Studies on Electronic and Magnetic Properties of X$_{2}$PtGa (X = Cr, Mn, Fe, Co) Heusler Alloys | Using first-principles calculations based on density functional theory, we
probe the electronic and magnetic properties of X$_{2}$PtGa (X being Cr, Mn,
Fe, Co) Heusler alloys. Our calculations predict that all these systems possess
inverse Heusler alloy structure in their respective ground states. Application
of tetrag... | 1603.08350v2 |
2019-08-20 | Coexistence of spin frustration and spin unfrustration induced spontaneous exchange bias in Heusler alloys | The mechanism of spontaneous exchange bias (SEB) and the dominant factor of
its blocking temperature are still unclear in Heusler alloys. Here, the related
investigations are performed in Mn2Ni1.5Al0.5 Heusler alloys with SEB. The
results of both magnetic measurements and first-principles calculations
confirmed that sp... | 1908.07149v1 |
2019-12-23 | Peculiarities of electronic transport and magnetic state in half-metallic ferromagnetic and spin gapless semiconducting Heusler alloys | A brief survey of experimental and theoretical studies of half-metallic
ferromagnets (HMFs) and spin gapless semiconductors is given, the possible
candidates being the X$_2$YZ (X = Mn, Fe, Co; Y = Ti, V, Cr, Mn, Fe, Co, Ni; Z
= Al, Si, Ga, Ge, In, Sn, Sb) Heusler alloys. The data on the electrical
resistivity, normal a... | 1912.10771v1 |
2020-03-20 | A ternary map of Ni-Mn-Ga Heusler alloys from ab initio calculations | In the present work, the aspects of magnetic and structural properties of
Ni-Mn-Ga alloys are described in the framework of fist-principles approach and
mapped into ternary composition diagrams. The stable atomic arrangement and
magnetic alignment for compositions with cubic austenite and tetragonal
martensite structur... | 2003.09128v1 |
2020-06-05 | Anomalous dependence of thermoelectric parameters on carrier concentration and electronic structure in Mn-substituted Fe2CrAl Heusler alloy | We investigate the high temperature thermoelectric properties of Heusler
alloys Fe2-xMnxCrAl (0<x<1). Substitution of 12.5% Mn at Fe-site (x = 0.25)
causes a significant increase in high temperature resistivity (\r{ho}) and an
enhancement in the Seebeck coefficient (S), as compared to the parent alloy.
However, as the ... | 2006.03234v2 |
2020-09-24 | Electronic Structure and Thermoelectric Properties of Half-Heusler Alloys NiTZ | We have investigated the electronic and thermoelectric properties of
half-Heusler alloys NiTZ (T = Sc, and Ti; Z = P, As, Sn, and Sb) having 18
valence electron. Calculations are performed by means of density functional
theory and Boltzmann transport equation with constant relaxation time
approximation, validated by Ni... | 2009.11916v4 |
2020-12-22 | Structural insight using anomalous XRD into Mn2CoAl Heusler alloy films grown by magnetron sputtering, IBAS and MBE techniques | Inverse Heusler alloy Mn2CoAl thin films, known as a spin-gapless
semiconductor (SGS), grown by three different methods: ultra-high vacuum
magnetron spattering, Ar-ion beam assisted sputtering, and molecular beam
epitaxy, are investigated by comparing their electric transport properties,
microstructures and atomic-leve... | 2012.12282v1 |
2021-02-01 | Electronic, magnetic and galvanomagnetic properties of Co-based Heusler alloys: possible states of a half-metallic ferromagnet and spin gapless semiconductor | Parameters of the energy gap and, consequently, electronic, magnetic and
galvanomagnetic properties in different X$_2$YZ Heusler alloys can vary quite
strongly. In particular, half-metallic ferromagnets (HMFs) and spin gapless
semiconductors (SGSs) with almost 100% spin polarization of charge carriers are
promising mat... | 2102.00952v1 |
2021-04-22 | Chemical bonding origin of the thermoelectric power factor in Half-Heusler semiconductors | Intermetallic semiconductors with the cubic Half-Heusler structure (XYZ) have
excellent thermoelectric properties. This has been attributed to the high
degeneracy of the carrier pockets in the band structure, but large differences
are found between different material compositions. Half-Heuslers are often
interpreted wi... | 2104.11281v1 |
2021-05-11 | First-principles calculations and experimental studies on Co2FeGe Heusler alloy nanoparticles for spintronics applications | Here, we report the synthesis and physical properties of Co2FeGe (CFG)
Heusler alloy (HA) nanoparticles (NPs). The NPs of size 23 nm are prepared
using the co-precipitation method. X-ray and selected area electron diffraction
patterns have confirmed the cubic Heusler phase of the NPs with the
A2-disorder. These NPs are... | 2105.05200v1 |
2021-09-23 | Tuning magnetic antiskyrmion stability in tetragonal inverse Heusler alloys | The identification of materials supporting complex, tunable magnetic order at
ambient temperatures is foundational to the development of new magnetic device
architectures. We report the design of Mn2XY tetragonal inverse Heusler alloys
that are capable of hosting magnetic antiskyrmions whose stability is sensitive
to e... | 2109.11423v1 |
2021-09-24 | Impact of local arrangement of Fe and Ni on the phase stability and magnetocrystalline anisotropy in Fe-Ni-Al Heusler alloys | On the basis of density functional calculations, we report on a comprehensive
study of the influences of atomic arrangement and Ni substitution for Al on the
ground state structural and magnetic properties for Fe$_2$Ni$_{1+x}$Al$_{1-x}$
Heusler alloys. We discuss systematically the competition between five
Heusler-type... | 2109.12005v2 |
2023-09-06 | Development of a self-consistent thermodynamically optimized database along with phase transition experiments in Ni-Mn-Ga system for magnetocaloric applications | Magnetocaloric materials have received significant attention of research
community as they can minimize the use of harmful gases (CFCs, HFCs) and render
eco-friendly refrigeration. Heusler alloys (Ni2MnGa) are known for their
magnetocaloric effects, which make them useful as energy efficient and
eco-friendly refrigerat... | 2309.02694v1 |
2024-03-12 | Ferrimagnetic Heusler tunnel junctions with fast spin-transfer torque switching enabled by low magnetization | Magnetic random access memory that uses magnetic tunnel junction memory cells
is a high performance, non-volatile memory technology that goes beyond
traditional charge-based memories. Today its speed is limited by the high
magnetization of the memory storage layer. Here we show that fast and highly
reliable switching i... | 2403.08112v1 |
2023-02-22 | Influence of Gd-rich precipitates on the martensitic transformation, magnetocaloric effect and mechanical properties of Ni-Mn-In Heusler alloys -- A comparative study | A multi-stimuli cooling cycle can be used to increase the cyclic caloric
performance of multicaloric materials like Ni-Mn-In Heusler alloys. However,
the use of a uniaxial compressive stress as an additional external stimulus to
a magnetic field requires good mechanical stability. Improvement of mechanical
stability an... | 2302.11439v1 |
2008-10-29 | Thermodynamics of the Heusler alloy Co_2-xMn_1+xSi: a combined density functional theory and cluster expansion study | Previous studies indicated that intrinsic point defects play a crucial role
for the density of states of ferromagnetic half-metals in the band gap region:
At large concentrations, defect-derived bands might close the gap at the Fermi
energy in the minority spin channel. In this work, structural disorder in the
Co- and ... | 0810.5354v2 |
2014-10-01 | Spin gapless semiconducting behavior in equiatomic quaternary CoFeMnSi Heusler alloy | Spin gapless semiconductors (SGS) form a new class of magnetic
semiconductors, which has a band gap for one spin sub band and zero band gap
for the other, and thus are useful for tunable spin transport based
applications. In this paper, we report the first experimental evidence for spin
gapless semiconducting behavior ... | 1410.0177v1 |
2016-08-09 | Compensated ferrimagnetic tetragonal Heusler thin films for antiferromagnetic spintronics | In recent years, antiferromagnetic spintronics has received much attention
since ideal antiferromagnets do not produce stray fields and are much more
stable to external magnetic fields compared to materials with net
magnetization. Akin to antiferromagnets, compensated ferrimagnets have zero net
magnetization but have t... | 1608.02887v1 |
2018-09-20 | Surface Majorana Flat Bands in $j=\frac{3}{2}$ Superconductors with Singlet-Quintet Mixing | Recent experiments have revealed the evidence of nodal-line superconductivity
in half-Heusler superconductors, e.g. YPtBi. Theories have suggested the
topological nature of such nodal-line superconductivity and proposed the
existence of surface Majorana flat bands on the (111) surface of half-Heusler
superconductors. D... | 1809.07455v2 |
2019-11-12 | Formation and magnetic properties of spark plasma sintered Mn$_{3-δ}$ ($δ$ = 0, 1) alloys | We present the synthesis of D0$_{22}$ Mn$_{3 - \delta}$Ga ($\delta$ = 0, 1)
Heusler alloys by Spark Plasma Sintering method. The single phase Mn$_3$Ga
(T$_\mathrm{c}$ $\simeq$ 780 K) is synthesized, while Mn$_2$Ga (T$_\mathrm{c}$
$\simeq$ 710 K) is found to coexist with a near-stoichiometric room temperature
paramagnet... | 1911.05040v1 |
2021-07-19 | Impact of local arrangement of Fe and Ni in Fe-Ni-Al Heusler alloys on the phase stability and magnetocrystalline anisotropy | On the basis of the density functional calculations in combination with the
supercell approach, we report on a complete study of the influences of atomic
arrangement and Ni substitution for Al on the ground state structural and
magnetic properties for Fe$_2$Ni$_{1+x}$Al$_{1-x}$ Heusler alloys. We discuss
systematically... | 2107.08804v2 |
2019-03-11 | Evidence for the formation of nanoprecipitates with magnetically disordered regions in bulk $\mathrm{Ni}_{50}\mathrm{Mn}_{45}\mathrm{In}_{5}$ Heusler alloys | Shell ferromagnetism is a new functional property of certain Heusler alloys
which has been recently observed in
$\mathrm{Ni}_{50}\mathrm{Mn}_{45}\mathrm{In}_{5}$. We report the results of a
comparative study of the magnetic microstructure of bulk
$\mathrm{Ni}_{50}\mathrm{Mn}_{45}\mathrm{In}_{5}$ Heusler alloys using
ma... | 1903.04183v1 |
2020-03-25 | Establishing the carrier scattering phase diagram for ZrNiSn-based half-Heusler thermoelectric materials | Chemical doping is one of the most important strategies for tuning electrical
properties of semiconductors, particularly thermoelectric materials. Generally,
the main role of chemical doping lies in optimizing the carrier concentration,
but there can potentially be other important effects. Here, we show that
chemical d... | 2003.11222v3 |
2020-06-03 | Half-Heusler thermoelectric materials: NMR studies | We report $^{59}$Co, $^{93}$Nb, and $^{121}$Sb nuclear magnetic resonance
(NMR) measurements combined with density functional theory (DFT) calculations
on a series of half-Heusler semiconductors, including NbCoSn, ZrCoSb, TaFeSb
and NbFeSb, to better understand their electronic properties and general
composition-depend... | 2006.02013v1 |
2020-11-06 | Thermoelectric power factor under strain-induced band-alignment in the half-Heuslers NbCoSn and TiCoSb | Band convergence is an effective strategy to improve the thermoelectric
performance of complex bandstructure thermoelectric materials. Half-Heuslers
are good candidates for band convergence studies because they have multiple
bands near the valence bad edge that can be converged through various band
engineering approach... | 2011.04288v1 |
2021-05-05 | Rhodium based half-Heusler alloys as possible optoelectronic and thermoelectric materials | On the basis of density functional theory and semi-classical Boltzmann
theory, we have investigated the structural, elastic, electronic, optical and
thermoelectric properties of 18--valence electron count rhodium based
half-Heusler alloys focusing on RhTiP, RhTiAs, RhTiSb, and RhTiBi. The absence
of imaginary frequenci... | 2105.02177v1 |
2021-10-05 | Tuning the Parity Mixing of Singlet-Septet Pairing in a Half-Heusler Superconductor | In superconductors, electrons with spin ${s=1/2}$ form Cooper pairs whose
spin structure is usually singlet (${S=0}$) or triplet (${S=1}$). When the
electronic structure near the Fermi level is characterized by fermions with
angular momentum ${j=3/2}$ due to strong spin-orbit interactions, novel pairing
states such as ... | 2110.01819v2 |
2022-08-10 | Defect engineering and Fermi-level tuning in half-Heusler topological semimetals | Three-dimensional topological semimetals host a range of interesting quantum
phenomena related to band crossing that give rise to Dirac or Weyl fermions,
and can be potentially engineered into novel quantum devices. Harvesting the
full potential of these materials will depend on our ability to position the
Fermi level ... | 2208.05415v2 |
2023-03-08 | Spin-valve nature and giant coercivity of a ferrimagnetic spin semimetal Mn$_2$IrGa | Spin semimetals are amongst the most recently discovered new class of
spintronic materials, which exhibit a band gap in one spin channel and
semimetallic feature in the other, thus facilitating tunable spin transport.
Here, we report Mn$_2$IrGa to be a candidate material for spin semimetal along
with giant coercivity a... | 2303.04649v2 |
2017-01-28 | Half-metallicity versus Symmetry in Pt, Ni and Co-based Half Heusler Alloys: A First-principles Calculation | Using first principles calculations based on density functional theory, we
study the geometric, electronic, and magnetic properties of Pt, Ni and Co-based
half Heusler alloys, namely, Pt$BC$, Ni$BC$ and Co$BC$ ($B$ = Cr, Mn and Fe;
$C$ = Al, Si, P, S, Ga, Ge, As, Se, In, Sn, Sb and Te). We calculate the
formation energ... | 1701.08282v2 |
2014-06-03 | Phase coexistence and interrupted 1st order transition in magnetic shape memory alloys | Current theoretical studies on structural and magnetic properties of
functional Ni-Mn-Z (Z = Ga, In, Sn) Heusler alloys address the origin of the
structural transition from the austenite to martensite, and also address the
dominant contribution to the latent heat associated with this
magneto-structural transition. This... | 1406.0627v1 |
2022-10-25 | Conventional Half-Heusler Alloys Advance State-of-the-Art Thermoelectric Properties | Half-Heusler (HH) phases have garnered much attention as thermally stable and
non-toxic thermoelectric materials for power conversion. The most studied
alloys to date utilize Hf, Zr, and Ti as the base components. These alloys can
achieve a moderate dimensionless figure of merit, ZT, near 1. Recent studies
have advance... | 2210.13949v1 |
2024-02-08 | Inflation and Isotropization in Quintom Cosmology | This paper studies inflation and isotropization in the quintom model in the
Bianchi I, Bianchi III, and Kantowski-Sachs backgrounds. First, we investigate
inherent properties and generalize Heusler's proposition. Then by the use of
the dynamical system approach, we consider the system in multiplicative and
collective m... | 2402.05454v1 |
2015-07-05 | k-bitransitive and compound operators on Banach spaces | In this this paper, we introduce new classes of operators in complex Banach
spaces, which we call k-bitransitive operators and compound operators to study
the direct sum of diskcyclic operators. We create a set of sufficient
conditions for k-bitransitivity and compound. We show the relation between
topologically mixing... | 1507.01166v1 |
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