publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2010-09-29 | Acoustically driven ferromagnetic resonance | Surface acoustic waves (SAW) in the GHz frequency range are exploited for the
all-elastic excitation and detection of ferromagnetic resonance (FMR) in a
ferromagnetic/ferroelectric (nickel/lithium niobate) hybrid device. We measure
the SAW magneto-transmission at room temperature as a function of frequency,
external ma... | 1009.5798v2 |
2010-10-05 | Effects of Strong Gravitational Lensing on Millimeter-Wave Galaxy Number Counts | We study the effects of strong lensing on the observed number counts of mm
sources using a ray tracing simulation and two number count models of unlensed
sources. We employ a quantitative treatment of maximum attainable magnification
factor depending on the physical size of the sources, also accounting for
effects of l... | 1010.0998v2 |
2010-10-15 | The Significance of Non-ergodicity Property of Statistical Mechanics Systems for Understanding Resting State of a Living Cell | A better grasp of the physical foundations of life is necessary before we can
understand the processes occurring inside a living cell. In his physical theory
of the cell, American physiologist Gilbert Ling introduced an important notion
of the resting state of the cell. He describes this state as an independent
stable ... | 1010.3226v1 |
2010-11-29 | Superoperator Analysis of Entanglement in a Four-Qubit Cluster State | In this paper we utilize superoperator formalism to explore the entanglement
evolution of four-qubit cluster states in a number of decohering environments.
A four-qubit cluster state is a resource for the performance of an arbitrary
single logical qubit rotation via measurement based cluster state quantum
computation. ... | 1011.6336v2 |
2011-02-14 | Computing the Ball Size of Frequency Permutations under Chebyshev Distance | Let $S_n^\lambda$ be the set of all permutations over the multiset
$\{\overbrace{1,...,1}^{\lambda},...,\overbrace{m,...,m}^\lambda\}$ where
$n=m\lambda$. A frequency permutation array (FPA) of minimum distance $d$ is a
subset of $S_n^\lambda$ in which every two elements have distance at least $d$.
FPAs have many appli... | 1102.2799v2 |
2011-02-25 | Modeling Extragalactic Foregrounds and Secondaries for Unbiased Estimation of Cosmological Parameters From Primary CMB Anisotropy | Using the latest physical modeling and constrained by the most recent data,
we develop a phenomenological parameterized model of the contributions to
intensity and polarization maps at millimeter wavelengths from external
galaxies and Sunyaev-Zeldovich effects. We find such modeling to be necessary
for estimation of co... | 1102.5195v1 |
2011-03-02 | Switching dynamics of a magnetostrictive single-domain nanomagnet subjected to stress | The temporal evolution of the magnetization vector of a single-domain
magnetostrictive nanomagnet, subjected to in-plane stress, is studied by
solving the Landau-Lifshitz-Gilbert equation. The stress is ramped up linearly
in time and the switching delay, which is the time it takes for the
magnetization to flip, is comp... | 1103.0352v1 |
2011-03-21 | Delay Constrained Throughput Analysis of a Correlated MIMO Wireless Channel | The maximum traffic arrival rate at the network for a given delay guarantee
(delay constrained throughput) has been well studied for wired channels.
However, few results are available for wireless channels, especially when
multiple antennas are employed at the transmitter and receiver. In this work,
we analyze the netw... | 1103.4016v1 |
2011-03-29 | Current induced rotational torques in the skyrmion lattice phase of chiral magnets | In chiral magnets without inversion symmetry, the magnetic structure can form
a lattice of magnetic whirl lines, a two-dimensional skyrmion lattice,
stabilized by spin-orbit interactions in a small range of temperatures and
magnetic fields. The twist of the magnetization within this phase gives rise to
an efficient cou... | 1103.5548v2 |
2011-04-07 | Finite-size effects on the magnetoelectric response of field-driven ferroelectric/ferromagnetic chains | We study theoretically the coupled multiferroic dynamics of one-dimensional
ferroelectric/ferromagnet chains driven by harmonic magnetic and electric
fields as a function of the chain length. A linear magnetoelectric coupling is
dominated by the spin-polarized screening charge at the interface. We performed
Monte-Carlo... | 1104.1269v3 |
2011-04-12 | The Effect of Disorder in Superfluid Double Layer Graphene | We investigate the superfluid properties of disordered double layer graphene
systems using the non-equilibrium Green's function (NEGF) formalism. The
complexity of such a structure makes it imperative to study the effects of
lattice vacancies which will inevitably arise during fabrication. We present
and compare room t... | 1104.2343v1 |
2011-05-12 | Incremental Cycle Detection, Topological Ordering, and Strong Component Maintenance | We present two on-line algorithms for maintaining a topological order of a
directed $n$-vertex acyclic graph as arcs are added, and detecting a cycle when
one is created. Our first algorithm handles $m$ arc additions in $O(m^{3/2})$
time. For sparse graphs ($m/n = O(1)$), this bound improves the best previous
bound by ... | 1105.2397v1 |
2011-05-30 | Orthogonal Matching Pursuit: A Brownian Motion Analysis | A well-known analysis of Tropp and Gilbert shows that orthogonal matching
pursuit (OMP) can recover a k-sparse n-dimensional real vector from 4 k log(n)
noise-free linear measurements obtained through a random Gaussian measurement
matrix with a probability that approaches one as n approaches infinity. This
work strengt... | 1105.5853v1 |
2011-06-07 | Magneto-optical Kerr Effect Studies of Square Artificial Spin Ice | We report a magneto-optical Kerr effect study of the collective magnetic
response of artificial square spin ice, a lithographically-defined array of
single-domain ferromagnetic islands. We find that the anisotropic inter-island
interactions lead to a non-monotonic angular dependence of the array coercive
field. Compari... | 1106.1394v2 |
2011-06-15 | Dissipative hydrodynamic equation of a ferromagnetic Bose-Einstein condensate: Analogy to magnetization dynamics in conducting ferromagnets | The hydrodynamic equation of a spinor Bose-Einstein condensate (BEC) gives a
simple description of spin dynamics in the condensate. We introduce the
hydrodynamic equation of a ferromagnetic BEC with dissipation originating from
the energy dissipation of the condensate. The dissipative hydrodynamic equation
has the same... | 1106.2876v4 |
2011-07-02 | Energy dissipation and switching delay in spin-transfer torque switching of nanomagnets with low-saturation magnetization in the presence of thermal fluctuations | A common ploy to reduce the switching current and energy dissipation in
spin-transfer-torque driven magnetization switching of shape-anisotropic
single-domain nanomagnets is to employ magnets with low saturation
magnetization $M_s$ and high shape-anisotropy. The high shape-anisotropy
compensates for low $M_s$ to keep t... | 1107.0387v2 |
2011-08-01 | Noise Sensitivity in Continuum Percolation | We prove that the Poisson Boolean model, also known as the Gilbert disc
model, is noise sensitive at criticality. This is the first such result for a
Continuum Percolation model, and the first for which the critical probability
p_c \ne 1/2. Our proof uses a version of the Benjamini-Kalai-Schramm Theorem
for biased prod... | 1108.0310v2 |
2011-08-23 | Vortex Lines in Topological Insulator-Superconductor Heterostructures | 3D topological insulator/s-wave superconductor heterostructures have been
predicted as candidate systems for the observation of Majorana fermions in the
presence of superconducting vortices. In these systems, Majorana fermions are
expected to form at the interface between the topological insulator and the
superconducto... | 1108.4711v1 |
2011-08-28 | Low-complexity quantum codes designed via codeword-stabilized framework | We consider design of the quantum stabilizer codes via a two-step,
low-complexity approach based on the framework of codeword-stabilized (CWS)
codes. In this framework, each quantum CWS code can be specified by a graph and
a binary code. For codes that can be obtained from a given graph, we give
several upper bounds on... | 1108.5490v1 |
2011-09-16 | Parallel Sparse Matrix-Matrix Multiplication and Indexing: Implementation and Experiments | Generalized sparse matrix-matrix multiplication (or SpGEMM) is a key
primitive for many high performance graph algorithms as well as for some linear
solvers, such as algebraic multigrid. Here we show that SpGEMM also yields
efficient algorithms for general sparse-matrix indexing in distributed memory,
provided that the... | 1109.3739v2 |
2011-10-06 | A new class of codes for Boolean masking of cryptographic computations | We introduce a new class of rate one-half binary codes: {\bf complementary
information set codes.} A binary linear code of length $2n$ and dimension $n$
is called a complementary information set code (CIS code for short) if it has
two disjoint information sets. This class of codes contains self-dual codes as
a subclass... | 1110.1193v2 |
2011-10-31 | Calculation of coercivity of magnetic nanostructures at finite temperatures | We report a finite temperature micromagnetic method (FTM) that allows for the
calculation of the coercive field of arbitrary shaped magnetic nanostructures
at time scales of nanoseconds to years. Instead of directly solving the
Landau-Lifshitz-Gilbert equation, the coercive field is obtained without any
free parameter ... | 1110.6789v1 |
2011-11-10 | Magnetic friction: From Stokes to Coulomb behavior | We demonstrate that in a ferromagnetic substrate, which is continuously
driven out of equilibrium by a field moving with constant velocity $v$, at
least two types of friction may occur when $v$ goes to zero: The substrate may
feel a friction force proportional to $v$ (Stokes friction), if the field
changes on a time sc... | 1111.2494v1 |
2011-11-15 | Revisiting No-Scale Supergravity Inspired Scenarios | We consider no-scale supergravity inspired scenarios, emphasizing the
possible dynamical determination of the soft supersymmetry-breaking parameters
as triggered by the radiative corrections that lift an essentially flat
tree-level potential in the hidden sector. We (re)emphasize the important role
played by the scale-... | 1111.3455v1 |
2011-11-24 | Spin-Wave Modes and Their Intense Excitation Effects in Skyrmion Crystals | We theoretically study spin-wave modes and their intense excitations
activated by microwave magnetic fields in the skyrmion-crystal phase of
insulating magnets by numerically analyzing a two-dimensional spin model using
the Landau-Lifshitz-Gilbert equation. Two peaks of spin-wave resonances with
frequencies of ~1 GHz a... | 1111.5667v1 |
2011-11-26 | Energy dissipation and switching delay in stress-induced switching of multiferroic devices in the presence of thermal fluctuations | Switching the magnetization of a shape-anisotropic 2-phase multiferroic
nanomagnet with voltage-generated stress is known to dissipate very little
energy ($<$ 1 aJ for a switching time of $\sim$0.5 ns) at 0 K temperature.
Here, we show by solving the stochastic Landau-Lifshitz-Gilbert equation that
switching can be car... | 1111.6129v1 |
2011-11-30 | Multi-Weyl Topological Semimetals Stabilized by Point Group Symmetry | We perform a complete classification of two-band $\bk\cdot\mathbf{p}$
theories at band crossing points in 3D semimetals with $n$-fold rotation
symmetry and broken time-reversal symmetry. Using this classification, we show
the existence of new 3D topological semimetals characterized by
$C_{4,6}$-protected double-Weyl no... | 1111.7309v2 |
2011-12-01 | Gate controlled Spin-Density Wave and Chiral FFLO Superconducting phases in interacting Quantum Spin Hall edge states | We explore the phases exhibited by an interacting quantum spin Hall edge
state in the presence of finite chemical potential (applied gate voltage) and
spin imbalance (applied magnetic field). We find that the helical nature of the
edge state gives rise to orders that are expected to be absent in non-chiral
one-dimensio... | 1112.0289v1 |
2011-12-04 | A New Approach to Incremental Cycle Detection and Related Problems | We consider the problem of detecting a cycle in a directed graph that grows
by arc insertions, and the related problems of maintaining a topological order
and the strong components of such a graph. For these problems, we give two
algorithms, one suited to sparse graphs, and the other to dense graphs. The
former takes t... | 1112.0784v1 |
2011-12-05 | Vortex core magnetization dynamics induced by thermal excitation | We investigate the effect of temperature on the dynamic properties of
magnetic vortices in small disks. Our calculations use a stochastic version of
the Landau-Lifshitz-Gilbert (LLG) equation, valid for finite temperatures well
below the Curie critical temperature. We show that a finite temperature induces
a vortex pre... | 1112.0911v2 |
2011-12-08 | A 2-20 GHz Analog Lag-Correlator for Radio Interferometry | We present the design and testing of a 2-20 GHz continuum band analog lag
correlator with 16 frequency channels for astronomical interferometry. The
correlator has been designed for future use with a prototype single-baseline
interferometer operating at 185-275 GHz. The design uses a broadband Wilkinson
divider tree wi... | 1112.1982v1 |
2011-12-12 | An analysis of constraints on relativistic species from primordial nucleosynthesis and the cosmic microwave background | We present constraints on the number of relativistic species from a joint
analysis of cosmic microwave background (CMB) fluctuations and light element
abundances (helium and deuterium) compared to big bang nucleosynthesis (BBN)
predictions. Our BBN calculations include updates of nuclear rates in light of
recent experi... | 1112.2683v1 |
2011-12-22 | Higgs boson decay into 2 photons in the type~II Seesaw Model | We study the two photon decay channel of the Standard Model-like component of
the CP-even Higgs bosons present in the type II Seesaw Model. The corresponding
cross-section is found to be significantly enhanced in parts of the parameter
space, due to the (doubly-)charged Higgs bosons' $(H^{\pm \pm})H^\pm$ virtual
contri... | 1112.5453v1 |
2012-01-18 | Cavity approach to sphere packing in Hamming space | In this paper we study the hard sphere packing problem in the Hamming space
by the cavity method. We show that both the replica symmetric and the replica
symmetry breaking approximations give maximum rates of packing that are
asymptotically the same as the lower bound of Gilbert and Varshamov.
Consistently with known n... | 1201.3863v2 |
2012-01-19 | Impact of microstructure, temperature and strain ratio on energy-based low- cycle fatigue life prediction models for TiAl alloys | In this paper, two fatigue lifetime prediction models are tested on TiAl
intermetallic using results from uniaxial low-cycle fatigue tests. Both
assessments are based on dissipated energy but one of them considers a
hydrostatic pressure correction. This work allows to confirm, on this kind of
material, the linear natur... | 1201.4084v1 |
2012-01-23 | Influence of the magnetoelectric coupling on the electric field induced magnetization reversal in a composite non-strained multiferroic chain | We study theoretically the multiferroic dynamics in a composite
one-dimensional system consisting of BaTiO3 multiferroically coupled to an iron
chain. The method treats the magnetization and the polarization as
thermodynamic quantities describable via a combination of the Landau-Lifshits-
Gilbert and the Ginzburg-Landa... | 1201.4740v1 |
2012-01-27 | Domain-wall complexes in ferromagnetic stripes | Interaction of domain walls (DWs) in ferromagnetic stripes is studied with
relevance to the formation of stable complexes of many domains. Two DW system
is described with the Landau-Lifshitz-Gilbert equation including regimes of
narrow and wide stripes which correspond the presence of transverse and vortex
DWs. The DWs... | 1201.5760v3 |
2012-01-31 | Interlayer Transport in Disordered Semiconductor Electron Bilayers | We study the effects of disorder on the interlayer transport properties of
disordered semiconductor bilayers outside of the quantum Hall regime by
performing self-consistent quantum transport calculations. We find that the
addition of material disorder to the system affects interlayer interactions
leading to significan... | 1202.0053v1 |
2012-02-01 | Imaging topologically protected transport with quantum degenerate gases | Ultracold and quantum degenerate gases held near conductive surfaces can
serve as sensitive, high resolution, and wide-area probes of electronic current
flow. Previous work has imaged transport around grain boundaries in a gold wire
by using ultracold and Bose-Einstein condensed atoms held microns from the
surface with... | 1202.0060v2 |
2012-02-02 | Large deviations and transitions between equilibria for stochastic Landau-Lifshitz-Gilbert equation | We study a stochastic Landau-Lifshitz equation on a bounded interval and with
finite dimensional noise. We first show that there exists a pathwise unique
solution to this equation and that this solution enjoys the maximal regularity
property. Next, we prove the large deviations principle for small noise
asymptotic of s... | 1202.0370v2 |
2012-02-06 | Atomic level micromagnetic model of recording media switching at elevated temperatures | An atomic level micromagnetic model of granular recording media is developed
and applied to examine external field-induced grain switching at elevated
temperatures which captures non-uniform reversal modes. The results are
compared with traditional methods which employ the Landau-Lifshitz-Gilbert
equations based on uni... | 1202.1131v1 |
2012-02-10 | A model of magnetic order in hexagonal HoMnO3 | Symmetry arguments are used to develop a spin Hamiltonian for the description
of the complex magnetic ordering in HoMnO$_3$. Using a novel application of the
Landau Lifshitz Gilbert dynamic torque equations to this model of the
frustrated Mn ions on an $AB$ stacked triangular antiferromagnetic, it is shown
that the fou... | 1202.2321v1 |
2012-02-13 | Switching Distributions for Perpendicular Spin-Torque Devices within the Macrospin Approximation | We model "soft" error rates for writing (WSER) and for reading (RSER) for
perpendicular spin-torque memory devices by solving the Fokker-Planck equation
for the probability distribution of the angle that the free layer magnetization
makes with the normal to the plane of the film. We obtain: (1) an exact, closed
form, a... | 1202.2621v1 |
2012-02-13 | Error- and Loss-Tolerances of Surface Codes with General Lattice Structures | We propose a family of surface codes with general lattice structures, where
the error-tolerances against bit and phase errors can be controlled
asymmetrically by changing the underlying lattice geometries. The surface codes
on various lattices are found to be efficient in the sense that their threshold
values universal... | 1202.2743v1 |
2012-02-28 | A method for exploratory repeated-measures analysis applied to a breast-cancer screening study | When a model may be fitted separately to each individual statistical unit,
inspection of the point estimates may help the statistician to understand
between-individual variability and to identify possible relationships. However,
some information will be lost in such an approach because estimation
uncertainty is disrega... | 1202.6133v1 |
2012-03-15 | Size bias and differential lensing of strongly lensed, dusty galaxies identified in wide-field surveys | We address two selection effects that operate on samples of gravitationally
lensed dusty galaxies identified in millimeter- and submillimeter-wavelength
surveys. First, we point out the existence of a "size bias" in such samples:
due to finite source effects, sources with higher observed fluxes are
increasingly biased ... | 1203.3267v2 |
2012-03-28 | Decoherence and mode-hopping in a magnetic tunnel junction-based spin-torque oscillator | We discuss the coherence of magnetic oscillations in a magnetic tunnel
junction-based spin-torque oscillator as a function of external field angle.
Time-frequency analysis shows mode-hopping between distinct oscillator modes,
which arises from linear and nonlinear couplings in the Landau-Lifshitz-Gilbert
equation, anal... | 1203.6300v1 |
2012-04-28 | Topological Excitonic Superfluids in Three Dimensions | We study the equilibrium and non-equilibrium properties of topological
dipolar intersurface exciton condensates within time-reversal invariant
topological insulators in three spatial dimensions without a magnetic field. We
elucidate that, in order to correctly identify the proper pairing symmetry
within the condensate ... | 1204.6351v2 |
2012-05-29 | Thermally-Assisted Spin-Transfer Torque Magnetization Reversal in Uniaxial Nanomagnets | We simulate the stochastic Landau-Lifshitz-Gilbert (LLG) dynamics of a
uniaxial nanomagnet out to sub-millisecond timescales using a graphical
processing unit based micromagnetic code and determine the effect of
geometrical tilts between the spin-current and uniaxial anisotropy axes on the
thermally assisted reversal d... | 1205.6509v1 |
2012-06-06 | Fractional Spin Josephson Effect and Electrically Controlled Magnetization in Quantum Spin Hall Edges | We explore a spin Josephson effect in a system of two ferromagnets coupled by
a tunnel junction formed of 2D time-reversal invariant topological insulators.
In analogy with the more commonly studied instance of the Josephson effect for
charge in superconductors, we investigate properties of the phase-coherent {\it
spin... | 1206.1295v2 |
2012-06-07 | Magnetic particle hyperthermia: Power losses under circularly polarized field in anisotropic nanoparticles | The deterministic Landau-Lifshitz-Gilbert equation has been used to
investigate the nonlinear dynamics of magnetization and the specific loss power
in magnetic nanoparticles with uniaxial anisotropy driven by a rotating
magnetic field, generalizing the results obtained for the isotropic case found
in [P. F. de Chatel, ... | 1206.1544v2 |
2012-06-27 | Searching for Fast Optical Transients using VERITAS Cherenkov Telescopes | Astronomical transients are intrinsically interesting things to study. Fast
optical transients (microsecond timescale) are a largely unexplored field of
optical astronomy mainly due to the fact that large optical telescopes are
oversubscribed. Furthermore, most optical observations use instruments with
integration time... | 1206.6535v1 |
2012-07-05 | Perpendicular Magnetization and Generic Realization of the Ising Model in Artificial Spin Ice | We have studied frustrated kagome arrays and unfrustrated honeycomb arrays of
magnetostatically-interacting single-domain ferromagnetic islands with
magnetization normal to the plane. The measured pairwise spin correlations of
both lattices can be reproduced by models based solely on nearest-neighbor
correlations. The ... | 1207.1456v1 |
2012-07-13 | Magnetic vortices induced by a moving tip | A two-dimensional easy-plane ferromagnetic substrate, interacting with a
dipolar tip which is magnetised perpendicular with respect to the easy plane is
studied numerically by solving the Landau-Lifshitz Gilbert equation. Due to the
symmetry of the dipolar field of the tip, in addition to the collinear
structure a magn... | 1207.3225v2 |
2012-07-24 | Bulk Topological Invariants in Noninteracting Point Group Symmetric Insulators | We survey various quantized bulk physical observables in two- and
three-dimensional topological band insulators invariant under translational
symmetry and crystallographic point group symmetries (PGS). In two-dimensional
insulators, we show that: (i) the Chern number of a $C_n$-invariant insulator
can be determined, up... | 1207.5767v2 |
2012-07-30 | 'MOHAWK' : a 4000-fiber positioner for DESpec | We present a concept for a 4000-fibre positioner for DESpec, based on the
Echidna 'tilting spine' technology. The DESpec focal plane is 450mm across and
curved, and the required pitch is ~6.75mm. The size, number of fibers and
curvature are all comparable with various concept studies for similar
instruments already und... | 1207.7011v2 |
2012-07-31 | Throughput of Rateless Codes over Broadcast Erasure Channels | In this paper, we characterize the throughput of a broadcast network with n
receivers using rateless codes with block size K. We assume that the underlying
channel is a Markov modulated erasure channel that is i.i.d. across users, but
can be correlated in time. We characterize the system throughput asymptotically
in n.... | 1207.7298v1 |
2012-08-01 | Streaming Codes for Channels with Burst and Isolated Erasures | We study low-delay error correction codes for streaming recovery over a class
of packet-erasure channels that introduce both burst-erasures and isolated
erasures. We propose a simple, yet effective class of codes whose parameters
can be tuned to obtain a tradeoff between the capability to correct burst and
isolated era... | 1208.0072v1 |
2012-08-23 | Inconsistencies in the description of pairing effects in nuclear level densities | Pairing correlations have a strong influence on nuclear level densities.
Empirical descriptions and theoretical models have been developed to take these
effects into account. The present article discusses cases, where descriptions
of nuclear level densities are inconsistent or in conflict with the present
understanding... | 1208.4709v1 |
2012-09-26 | Symmetry Protected Josephson Supercurrents in Three-Dimensional Topological Insulators | Coupling the surface state of a topological insulator (TI) to an s-wave
superconductor is predicted to produce the long-sought Majorana quasiparticle
excitations. However, superconductivity has not been measured in surface states
when the bulk charge carriers are fully depleted, i.e., in the true topological
regime tha... | 1209.5830v2 |
2012-10-09 | A microscopic model for ultrafast remagnetization dynamics | In this letter, we provide a microscopic model for the ultrafast
remagnetization of atomic moments already quenched above Stoner-Curie
temperature by a strong laser fluence. Combining first principles density
functional theory, atomistic spin dynamics utilizing the
Landau-Lifshitz-Gilbert equation and a three temperatu... | 1210.2616v1 |
2012-10-31 | Theory and Simulation of the diffusion of kinks on dislocations in bcc metals | Isolated kinks on thermally fluctuating (1/2)<111> screw, <100> edge and
(1/2)<111> edge dislocations in bcc iron are simulated under zero stress
conditions using molecular dynamics (MD). Kinks are seen to perform stochastic
motion in a potential landscape that depends on the dislocation character and
geometry, and the... | 1210.8327v2 |
2012-11-01 | Dynamically-generated pure spin current in single-layer graphene | The conductance mismatch problem limits the spin-injection efficiency
significantly, and spin-injection into graphene has been usually requiring
high-quality tunnel barriers to circumvent the conductance mismatch. We
introduce a novel approach, which enables generation of a pure spin current
into single-layer graphene ... | 1211.0124v1 |
2012-12-04 | Phenomenological theory of the giant magnetoimpedance of composite wires | Composite wires with a three-layered structure are known to show a
particularly large magnetoimpedance effect. The wires consist of a highly
conductive core, an insulating layer and an outer ferromagnetic shell. In order
to understand the origin of the effect a theory based on a coupling of the
Maxwell equations to the... | 1212.0710v3 |
2012-12-12 | Giant magnetoimpedance of composite wires with an insulation layer | Composite wires with a three-layered structure exhibit a large giant
magneto-impedance (GMI) effect, which can be used in sensitive magnetic field
sensors. To further investigate the origin of the GMI effect, composite wires
consisting of a highly conductive copper core, a silicon dioxide layer and an
outer Permalloy s... | 1212.2745v2 |
2012-12-13 | Theory of quasiparticle interference in mirror symmetric 2D systems and its application to surface states of topological crystalline insulators | We study symmetry protected features in the quasiparticle interference (QPI)
pattern of 2D systems with mirror symmetries and time-reversal symmetry, around
a single static point impurity. We show that, in the Fourier transformed local
density of states (FT-LDOS), $\rho(\bq,\omega)$, while the position of high
intensit... | 1212.3285v2 |
2013-01-25 | Chiral magnetism and helimagnons in a pyrochlore antiferromagnet | Recent neutron scattering measurements on the spinel CdCr2O4 revealed a rare
example of helical magnetic order in geometrically frustrated pyrochlore
antiferromagnet. The spin spiral characterized by an incommensurate wavevector
Q = 2pi (0, delta, 1) with delta ~0.09 is accompanied by a tetragonal
distortion. Here we c... | 1301.5958v1 |
2013-01-31 | Switching of Dipole Coupled Multiferroic Nanomagnets in the Presence of Thermal Noise: Reliability of Nanomagnetic Logic | The stress-induced switching behavior of a multiferroic nanomagnet, dipole
coupled to a hard nanomagnet, is numerically studied by solving the stochastic
Landau-Lifshitz-Gilbert (LLG) equation for a single domain macro-spin state.
Different factors were found to affect the switching probability in the
presence of therm... | 1301.7490v2 |
2013-02-01 | Vortex mechanics in planar nano-magnets | A collective-variable approach for the study of non-linear dynamics of
magnetic textures in planar nano-magnets is proposed. The variables are just
arbitrary parameters (complex or real) in the specified analytical function of
a complex variable, describing the texture in motion. Starting with such a
function, a formal... | 1302.0222v3 |
2013-02-03 | Correcting Camera Shake by Incremental Sparse Approximation | The problem of deblurring an image when the blur kernel is unknown remains
challenging after decades of work. Recently there has been rapid progress on
correcting irregular blur patterns caused by camera shake, but there is still
much room for improvement. We propose a new blind deconvolution method using
incremental s... | 1302.0439v2 |
2013-03-01 | Entropy Distance | Motivated by the approach of random linear codes, a new distance in the
vector space over a finite field is defined as the logarithm of the "surface
area" of a Hamming ball with radius being the corresponding Hamming distance.
It is named entropy distance because of its close relation with entropy
function. It is shown... | 1303.0070v2 |
2013-03-20 | On the Behavior of RObust Header Compression U-mode in Channels with Memory | The existing studies of RObust Header Compression (ROHC) have provided some
understanding for memoryless channel, but the behavior of ROHC for correlated
wireless channels is not well investigated in spite of its practical
importance. In this paper, the dependence of ROHC against its design parameters
for the Gilbert E... | 1303.4970v1 |
2013-03-21 | Tuning magnetic anisotropy in (001) oriented L10 (Fe1-xCux)55Pt45 films | We have achieved (001) oriented L10 (Fe1-xCux)55Pt45 thin films, with
magnetic anisotropy up to 3.6x10^7 erg/cm^3, using atomic-scale multilayer
sputtering and post annealing at 400 {\deg}C for 10 seconds. By fixing the Pt
concentration, structure and magnetic properties are systematically tuned by
the Cu addition. Inc... | 1303.5208v1 |
2013-03-28 | Spin Torque on Magnetic Textures Coupled to the Surface of a Three-Dimensional Topological Insulator | We investigate theoretically the spin torque and magnetization dynamic in a
thin ferromagnetic (FM) layer with spatially varying magnetization. The FM
layer is deposited on the surface of a topological insulator (TI). In the limit
of the adiabatic relaxation of electron spin along the magnetization, the
interaction bet... | 1303.7031v1 |
2013-04-03 | Synchronization of an array of spin torque nano oscillators in periodic applied external magnetic field | Considering an array of spin torque transfer nano oscillators (STNOs), we
have investigated the synchronization property of the system under the action
of a common periodically driven applied external magnetic field by numerically
analyzing the underlying system of Landau-Lifshitz-Gilbert-Slonczewski (LLGS)
equations f... | 1304.0875v1 |
2013-04-06 | Towards a living earth simulator | The Living Earth Simulator (LES) is one of the core components of the
FuturICT architecture. It will work as a federation of methods, tools,
techniques and facilities supporting all of the FuturICT simulation-related
activities to allow and encourage interactive exploration and understanding of
societal issues. Society... | 1304.1903v1 |
2013-05-13 | Backhopping effect in magnetic tunnel junctions: comparison between theory and experiment | We report on the magnetic switching and backhopping effects due to
spin-transfer-torque in magnetic tunnel junctions. Experimental data on the
current-induced switching in junctions with MgO tunnel barrier reveal a random
back-and-forth switching between the magnetization states, which appears when
the current directio... | 1305.2711v1 |
2013-05-15 | Robust Streaming Erasure Codes based on Deterministic Channel Approximations | We study near optimal error correction codes for real-time communication. In
our setup the encoder must operate on an incoming source stream in a sequential
manner, and the decoder must reconstruct each source packet within a fixed
playback deadline of $T$ packets. The underlying channel is a packet erasure
channel tha... | 1305.3596v1 |
2013-05-16 | Size-dependent magnetization switching characteristics and spin wave modes of FePt nanostructures | We present a comprehensive investigation of the size-dependent switching
characteristics and spin wave modes of FePt nanoelements. Curved nanomagnets
("caps") are compared to flat disks of identical diameter and volume over a
size range of 100 to 300nm. Quasi-static magnetization reversal analysis using
first-order rev... | 1305.3686v1 |
2013-05-28 | Reallocation Problems in Scheduling | In traditional on-line problems, such as scheduling, requests arrive over
time, demanding available resources. As each request arrives, some resources
may have to be irrevocably committed to servicing that request. In many
situations, however, it may be possible or even necessary to reallocate
previously allocated reso... | 1305.6555v1 |
2013-06-04 | Generalized splines on arbitrary graphs | Let G be a graph whose edges are labeled by ideals of a commutative ring. We
introduce a generalized spline, which is a vertex-labeling of G by elements of
the ring so that the difference between the labels of any two adjacent vertices
lies in the corresponding edge ideal. Generalized splines arise naturally in
combina... | 1306.0801v2 |
2013-06-04 | Large Chern Number Quantum Anomalous Hall Effect In Thin-film Topological Crystalline Insulators | Quantum anomalous Hall (QAH) insulators are two-dimensional (2D) insulating
states exhibiting properties similar to those of quantum Hall states but
without external magnetic field. They have quantized Hall conductance
$\sigma^H=Ce^2/h$, where integer $C$ is called the Chern number, and represents
the number of gapless... | 1306.0888v2 |
2013-06-07 | Free energy generalization of the Peierls potential in iron | In body-centered cubic (bcc) crystals, ${1}{2}111$ screw dislocations exhibit
high intrinsic lattice friction as a consequence of their non-planar core
structure, which results in a periodic energy landscape known as the Peierls
potential, $U_P$. The main features determining plastic flow, including its
stress and temp... | 1306.1633v4 |
2013-06-14 | On a decoupled linear FEM integrator for Eddy-current-LLG | We propose a numerical integrator for the coupled system of the eddy-current
equation with the nonlinear Landau-Lifshitz-Gilbert equation. The considered
effective field contains a general field contribution, and we particularly
cover exchange, anisotropy, applied field, and magnetic field (stemming from
the eddy-curre... | 1306.3319v1 |
2013-06-20 | Lower Bounds for the Area of Black Holes in Terms of Mass, Charge, and Angular Momentum | The most general formulation of Penrose's inequality yields a lower bound for
ADM mass in terms of the area, charge, and angular momentum of black holes.
This inequality is in turn equivalent to an upper and lower bound for the area
in terms of the remaining quantities. In this note, we establish the lower
bound for a ... | 1306.4739v2 |
2013-06-28 | Coherent Nonlinear Quantum Model for Composite Fermions | Originally proposed by Read [1] and Jain [2], the so-called
"composite-fermion" is a phenomenological attachment of two infinitely thin
local flux quanta seen as nonlocal vortices to two-dimensional (2D) electrons
embedded in a strong orthogonal magnetic field. In this letter, it is described
as a highly-nonlinear and ... | 1306.6869v1 |
2013-06-29 | First-principles calculations of current-induced spin-transfer torques in magnetic domain walls | Current-induced spin-transfer torques (STTs) have been studied in Fe, Co and
Ni domain walls (DWs) by the method based on the first-principles noncollinear
calculations of scattering wave functions expanded in the tight-binding
linearized muffin-tin orbital (TB-LMTO) basis. The results show that the
out-of-plane compon... | 1307.0062v1 |
2013-07-02 | Reversal mode instability and magnetoresistance in perpendicular (Co/Pd)/Cu/(Co/Ni) pseudo-spin-valves | We have observed distinct temperature-dependent magnetization reversal modes
in a perpendicular (Co/Pd)4/Co/Cu/(Co/Ni)4/Co pseudo-spin-valve, which are
correlated with spin-transport properties. At 300 K, magnetization reversal
occurs by vertically correlated domains. Below 200 K the hysteresis loop
becomes bifurcated ... | 1307.0853v1 |
2013-07-08 | Modal Analysis with Compressive Measurements | Structural Health Monitoring (SHM) systems are critical for monitoring aging
infrastructure (such as buildings or bridges) in a cost-effective manner. Such
systems typically involve collections of battery-operated wireless sensors that
sample vibration data over time. After the data is transmitted to a central
node, mo... | 1307.1960v1 |
2013-07-15 | On the Instabilities of the Walker Propagating Domain Wall Solution | A powerful mathematical method for front instability analysis that was
recently developed in the field of nonlinear dynamics is applied to the 1+1
(spatial and time) dimensional Landau-Lifshitz-Gilbert (LLG) equation. From the
essential spectrum of the LLG equation, it is shown that the famous Walker
rigid body propaga... | 1307.3825v3 |
2013-07-30 | Accurate Decoding of Pooled Sequenced Data Using Compressed Sensing | In order to overcome the limitations imposed by DNA barcoding when
multiplexing a large number of samples in the current generation of
high-throughput sequencing instruments, we have recently proposed a new
protocol that leverages advances in combinatorial pooling design (group
testing) doi:10.1371/journal.pcbi.1003010... | 1307.7810v1 |
2013-08-09 | Relativistic and thermal effects on the magnon spectrum of a ferromagnetic monolayer | A spin model including magnetic anisotropy terms and Dzyaloshinsky-Moriya
interactions is studied for the case of a ferromagnetic monolayer with C2v
symmetry like Fe/W(110). Using the quasiclassical stochastic
Landau-Lifshitz-Gilbert equations, the magnon spectrum of the system is derived
using linear response theory. ... | 1308.2082v2 |
2013-08-11 | New class of topological superconductors protected by magnetic group symmetries | We study a new type of three-dimensional topological superconductors that
exhibit Majorana zero modes (MZM) protected by a magnetic group symmetry, a
combined antiunitary symmetry composed of a mirror reflection and
time-reversal. This new symmetry enhances the noninteracting topological
classification of a superconduc... | 1308.2424v3 |
2013-08-26 | A Radio-Frequency-over-Fiber link for large-array radio astronomy applications | A prototype 425-850 MHz Radio-Frequency-over-Fiber (RFoF) link for the
Canadian Hydrogen Intensity Mapping Experiment (CHIME) is presented. The design
is based on a directly modulated Fabry-Perot (FP) laser, operating at ambient
temperature, and a single-mode fiber. The dynamic performance, gain stability,
and phase st... | 1308.5481v2 |
2013-08-30 | Energy dissipation of moved magnetic vortices | A two-dimensional easy-plane ferromagnetic substrate, interacting with a
dipolar tip which is magnetised perpendicular with respect to the easy plane is
studied numerically by solving the Landau-Lifshitz Gilbert equation. The
dipolar tip stabilises a vortex structure which is dragged through the system
and dissipates e... | 1308.6714v1 |
2013-10-16 | Domain wall motion in magnetic nanowires: An asymptotic approach | We develop a systematic asymptotic description for domain wall motion in
one-dimensional magnetic nanowires under the influence of small applied
magnetic fields and currents and small material anisotropy. The magnetization
dynamics, as governed by the Landau--Lifshitz--Gilbert equation, is
investigated via a perturbati... | 1310.4442v1 |
2013-10-23 | Exchange-dominated Standing Spin Wave Excitations under microwave irradiation in Ni80Fe20 Thin Films | We investigated the microwave-assisted DC voltages of ferromagnetic
resonances and exchangedominated standing spin wave excitations in two
different in-plane magnetized permalloy thin films via homodyne detection. The
line shapes of ferromagnetic resonance spectra and the dispersion curves of
ferromagnetic resonance an... | 1310.6108v1 |
2013-10-25 | Mode coupling in spin torque oscillators | A number of recent experimental works have shown that the dynamics of a
single spin torque oscillator can exhibit complex behavior that stems from
interactions between two or more modes of the oscillator. Examples are observed
mode-hopping or mode coexistence. There has been some intial work indicating
how the theory f... | 1310.6791v2 |
2013-10-31 | A Labeling Approach to Incremental Cycle Detection | In the \emph{incremental cycle detection} problem arcs are added to a
directed acyclic graph and the algorithm has to report if the new arc closes a
cycle. One seeks to minimize the total time to process the entire sequence of
arc insertions, or until a cycle appears.
In a recent breakthrough, Bender, Fineman, Gilber... | 1310.8381v1 |
2013-11-01 | Superfluid Spin Transport through Easy-Plane Ferromagnetic Insulators | Superfluid spin transport $-$ dissipationless transport of spin $-$ is
theoretically studied in a ferromagnetic insulator with easy-plane anisotropy.
We consider an open geometry where spin current is injected into the
ferromagnet from one side by a metallic reservoir with a nonequilibrium spin
accumulation, and ejecte... | 1311.0288v4 |
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