publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2018-04-05 | Stochastic ferrimagnetic Landau-Lifshitz-Bloch equation for finite magnetic structures | Precise modeling of the magnetization dynamics of nanoparticles with finite
size effects at fast varying temperatures is a computationally challenging
task. Based on the Landau-Lifshitz-Bloch (LLB) equation we derive a coarse
grained model for disordered ferrimagnets, which is both fast and accurate.
First, we incorpor... | 1804.01724v1 |
2018-04-06 | Temperature dependence of bulk viscosity within lattice simulation of $SU(3)$--gluodynamics | In this paper the temperature dependence of the $SU(3)$--gluodynamics bulk
viscosity is studied within lattice simulations. To carry out this study we
measure the correlation function of the trace of the energy-momentum tensor for
a set of temperatures within the range $T/T_c \in (0.9, 1.5)$. To extract the
bulk viscos... | 1804.02382v2 |
2018-04-16 | Anisotropy of exchange stiffness based on atomic-scale magnetic properties in rare-earth permanent magnet Nd$_2$Fe$_{14}$B | We examine the anisotropic properties of the exchange stiffness constant,
$\mathcal{A}$, for rare-earth permanent magnet, Nd$_2$Fe$_{14}$B, by connecting
analyses with two different scales of length, i.e., Monte Carlo (MC) method
with an atomistic spin model and Landau-Lifshitz-Gilbert (LLG) equation with a
continuous ... | 1804.05824v2 |
2018-03-29 | Percolative Mechanism of Aging in Zirconia-Containing Ceramics for Medical Applications | Recently, several episodes of fracture of zirconia ceramic femoral heads of
total hip prostheses have alarmed the medical and scientific community
regarding aging problems in zirconia prostheses. Such fractures cause immediate
local tissue reactions, which require urgent medical intervention to prevent
further complica... | 1804.08696v1 |
2018-03-30 | Reliability assessment in advanced nanocomposite materials for orthopaedic applications | Alumina-zirconia nano-composites were recently developed as alternative
bearing materials for orthopedics. Previous, preliminary reports show that such
alumina-zirconia nanocomposites exhibit high crack resistance and low wear
rate. In this paper, additional information is given in terms of wear, crack
resistance and a... | 1804.08702v1 |
2018-04-26 | Shape of a skyrmion | We propose a method of determining the shape of a two-dimensional magnetic
skyrmion, which can be parameterized as the position dependence of the
orientation of the local magnetic moment, by using the expansion in terms of
the eigenfunctions of the Schr\"{o}dinger equation of a harmonic oscillator. A
variational calcul... | 1804.10162v3 |
2018-04-30 | Modular Compact Modeling of Magnetic Tunnel Junction Devices | This paper describes a robust, modular, and physics- based circuit framework
to model conventional and emerging Magnetic Tunnel Junction (MTJ) devices.
Magnetization dynamics are described by the stochastic Landau-Lifshitz-Gilbert
(sLLG) equation whose results are rigorously benchmarked with a Fokker-Planck
Equation (F... | 1805.00066v2 |
2018-05-22 | Loss of Hall Conductivity Quantization in a Non-Hermitian Quantum Anomalous Hall Insulator | Recent work has extended topological band theory to open, non-Hermitian
Hamiltonians, yet little is understood about how non-Hermiticity alters the
topological quantization of associated observables. We address this problem by
studying the quantum anomalous Hall effect (QAHE) generated in the Dirac
surface states of a ... | 1805.08892v2 |
2018-05-31 | Spin-orbit torque induced dipole skyrmion motion at room temperature | We demonstrate deterministic control of dipole-field-stabilized skyrmions by
means of spin-orbit torques arising from heavy transition-metal seed layers.
Experiments are performed on amorphous Fe/Gd multilayers that are patterned
into wires and exhibit stripe domains and dipole skyrmions at room temperature.
We show th... | 1805.12517v1 |
2018-06-11 | Geometric Lagrangian averaged Euler-Boussinesq and primitive equations | In this article we derive the equations for a rotating stratified fluid
governed by inviscid Euler-Boussinesq and primitive equations that account for
the effects of the perturbations upon the mean. Our method is based on the
concept of geometric generalized Lagrangian mean recently introduced by Gilbert
and Vanneste, ... | 1806.05053v2 |
2018-06-14 | Topological quantization of the flow of magnetic skyrmions driven by a ratchet-like potential under thermal fluctuations | We consider a magnetic skyrmion adiabatically driven by a spin-polarized
electrical current periodic in both space and time and asymmetric in space, and
also subject to a random magnetic field representing the thermal fluctuations.
We show that when the random magnetic field is low enough, while the time
variation of t... | 1806.05354v1 |
2018-06-17 | Skyrmion Formation Induced by Antiferromagnetic-enhanced Interfacial Dzyaloshinskii Moriya Interaction | Ne\'el skyrmions originate from interfacial Dzyaloshinskii Moriya interaction
(DMI). Recent studies have explored using ferromagnet to host Ne\'el skyrmions
for device applications. However, challenges remain to reduce the size of
skyrmion to near 10 nm. Amorphous rare-earth-transitional-metal ferrimagnets
are attracti... | 1806.06334v1 |
2018-06-17 | Property Testing for Differential Privacy | We consider the problem of property testing for differential privacy: with
black-box access to a purportedly private algorithm, can we verify its privacy
guarantees? In particular, we show that any privacy guarantee that can be
efficiently verified is also efficiently breakable in the sense that there
exist two databas... | 1806.06427v2 |
2018-06-25 | Coupled Wire Models of Interacting Dirac Nodal Superconductors | Topological nodal superconductors possess gapless low energy excitations that
are characterized by point or line nodal Fermi surfaces. In this work, using a
coupled wire construction, we study topological nodal superconductors that have
protected Dirac nodal points. In this construction, the low-energy electronic
degre... | 1806.09599v1 |
2018-07-02 | A Broader View on Bias in Automated Decision-Making: Reflecting on Epistemology and Dynamics | Machine learning (ML) is increasingly deployed in real world contexts,
supplying actionable insights and forming the basis of automated
decision-making systems. While issues resulting from biases pre-existing in
training data have been at the center of the fairness debate, these systems are
also affected by technical a... | 1807.00553v2 |
2018-07-06 | Spin-torque-induced magnetization dynamics in ferrimagnets based on Landau-Lifshitz-Bloch Equation | A theoretical model based on the Landau-Lifshitz-Bloch equation is developed
to study the spin-torque effect in ferrimagnets. Experimental findings, such as
the temperature dependence, the peak in spin torque, and the angular-momentum
compensation, can be well captured. In contrast to the ferromagnet system, the
switch... | 1807.02445v1 |
2018-07-10 | Plumbing Constructions and the Domain of Outer Communication for 5-Dimensional Stationary Black Holes | The topology of the domain of outer communication for 5-dimensional
stationary bi-axisymmetric black holes is classified in terms of disc bundles
over the 2-sphere and plumbing constructions. In particular we find an
algorithmic bijective correspondence between the plumbing of disc bundles and
the rod structure formali... | 1807.03452v1 |
2018-07-13 | Deep Learning in the Wild | Deep learning with neural networks is applied by an increasing number of
people outside of classic research environments, due to the vast success of the
methodology on a wide range of machine perception tasks. While this interest is
fueled by beautiful success stories, practical work in deep learning on novel
tasks wit... | 1807.04950v1 |
2018-07-16 | Digital frequency multiplexing with sub-Kelvin SQUIDs | Digital frequency multiplexing (dfMux) is a readout architecture for
transition edge sensor-based detector arrays and is used on telescopes
including SPT-3G, POLARBEAR-2, and LiteBIRD. Here, we present recent progress
and plans for development of a sub-Kelvin SQUID architecture for digital
frequency multiplexed bolomet... | 1807.05995v1 |
2018-07-20 | Sphinx: a massively multiplexed fiber positioner for MSE | In this paper we present the Australian Astronomical Observatory's concept
design for Sphinx - a fiber positioned with 4332 spines on a 7.77mm pitch for
CFHT's Mauna Kea Spectroscopic Explorer (MSE) Telescope. Based on the Echidna
technology used with FMOS (on Subaru) and 4MOST (on VISTA), the next evolution
of the til... | 1807.09181v1 |
2018-07-30 | Graphs admitting only constant splines | We study {\em generalized graph splines,} introduced by Gilbert, Viel, and
the last author. For a large class of rings, we characterize the graphs that
only admit constant splines. To do this, we prove that if a graph has a
particular type of cutset (e.g., a bridge), then the space of splines naturally
decomposes as a ... | 1807.11515v2 |
2018-08-05 | Searching for patchy reionization from cosmic microwave background with hybrid quadratic estimators | We propose a hybrid quadratic estimator to measure cross correlations between
gravitational lensing of the cosmic microwave background (CMB) and differential
screening effects arising from fluctuations in the electron column density,
such as could arise from patchy reionization. The hybrid quadratic estimators
are vali... | 1808.01592v1 |
2018-08-08 | Revisiting Gilbert Strang's "A Chaotic Search for $i$" | In the paper "A Chaotic Search for $i$"~(\cite{strang1991chaotic}), Strang
completely explained the behaviour of Newton's method when using real initial
guesses on $f(x) = x^{2}+1$, which has only a pair of complex roots $\pm i$. He
explored an exact symbolic formula for the iteration, namely $x_{n}=\cot{
\left( 2^{n} ... | 1808.03229v1 |
2018-08-11 | Micromagnetic modeling of Terahertz oscillations in an antiferromagnetic material driven by spin-Hall effect | The realization of THz sources is a fundamental aspect for a wide range of
applications. Over different approaches, compact THz oscillators can be
realized taking advantage of dynamics in antiferromagnetic (AFMs) thin films
driven by spin-Hall effect. Here we perform a systematic study of these THz
oscillators within a... | 1808.03773v1 |
2018-08-30 | Iterative solution and preconditioning for the tangent plane scheme in computational micromagnetics | The tangent plane scheme is a time-marching scheme for the numerical solution
of the nonlinear parabolic Landau-Lifshitz-Gilbert equation (LLG), which
describes the time evolution of ferromagnetic configurations. Exploiting the
geometric structure of LLG, the tangent plane scheme requires only the solution
of one linea... | 1808.10281v1 |
2018-09-12 | Iterative Delegations in Liquid Democracy with Restricted Preferences | In this paper, we study liquid democracy, a collective decision making
paradigm which lies between direct and representative democracy. One main
feature of liquid democracy is that voters can delegate their votes in a
transitive manner so that: A delegates to B and B delegates to C leads to A
delegates to C. Unfortunat... | 1809.04362v2 |
2018-09-25 | Phase change materials for nano-polaritonics: a case study of hBN/VO2 heterostructures | Polaritonic excitation and control in van der Waals (vdW) materials exhibit
superior merits than conventional materials and thus hold new promise for
exploring light matter interactions. In this work, we created vdW
heterostructures combining hexagonal boron nitride (hBN) and a representative
phase change material - va... | 1809.09652v1 |
2018-10-08 | Causal isotonic regression | In observational studies, potential confounders may distort the causal
relationship between an exposure and an outcome. However, under some
conditions, a causal dose-response curve can be recovered using the
G-computation formula. Most classical methods for estimating such curves when
the exposure is continuous rely on... | 1810.03269v2 |
2018-10-10 | On the Approximation Properties of Random ReLU Features | We study the approximation properties of random ReLU features through their
reproducing kernel Hilbert space (RKHS). We first prove a universality theorem
for the RKHS induced by random features whose feature maps are of the form of
nodes in neural networks. The universality result implies that the random ReLU
features... | 1810.04374v3 |
2018-10-15 | ABACUS: Unsupervised Multivariate Change Detection via Bayesian Source Separation | Change detection involves segmenting sequential data such that observations
in the same segment share some desired properties. Multivariate change
detection continues to be a challenging problem due to the variety of ways
change points can be correlated across channels and the potentially poor
signal-to-noise ratio on ... | 1810.06167v1 |
2018-10-24 | Photoinduced topological spin texture in a metallic ferromagnet | Photoinduced nonequilibrium spin structure is examined in the double-exchange
model, in which itinerant electrons couple with localized spins through the
ferromagnetic Hund coupling. In particular, we focus on the transient spin
structure from the initial ferromagnetic metallic state to the steady
antiferromagnetic ord... | 1810.10244v1 |
2018-11-01 | Time Quantified Monte Carlo Method for Long-range Interacting Systems | We propose a method for simulating the stochastic dynamics of classical spin
systems with long-range interactions. The method incorporates the stochastic
cutoff (SCO) method, which is originally specialized for simulating equilibrium
state, into time quantified Monte Carlo (TQMC) method. We analytically prove
that the ... | 1811.00237v2 |
2018-11-01 | Spatial Functional Linear Model and its Estimation Method | The classical functional linear regression model (FLM) and its extensions,
which are based on the assumption that all individuals are mutually
independent, have been well studied and are used by many researchers. This
independence assumption is sometimes violated in practice, especially when data
with a network structu... | 1811.00314v1 |
2018-11-12 | New Theoretical Bounds and Constructions of Permutation Codes under Block Permutation Metric | Permutation codes under different metrics have been extensively studied due
to their potentials in various applications. Generalized Cayley metric is
introduced to correct generalized transposition errors, including previously
studied metrics such as Kendall's $\tau$-metric, Ulam metric and Cayley metric
as special cas... | 1811.04600v1 |
2018-11-13 | Classical Access Structures of Ramp Secret Sharing Based on Quantum Stabilizer Codes | In this paper we consider to use the quantum stabilizer codes as secret
sharing schemes for classical secrets. We give necessary and sufficient
conditions for qualified and forbidden sets in terms of quantum stabilizers.
Then we give a Gilbert-Varshamove-type sufficient condition for existence of
secret sharing schemes... | 1811.05217v7 |
2018-11-13 | Enhanced domain wall velocity near a ferromagnetic instability | Assuming a Fermi liquid behavior for $s$-conduction electrons, we rewrite the
extended Landau-Lifshitz-Gilbert (LLG) equation renormalized by interactions
through the Landau parameters $F^{a}_{l}$ ($l=0,1,2 \cdots$) in an explicit
form to describe the dynamic of a domain wall (DW) due to spin transfer torque
phenomenon... | 1811.05380v4 |
2018-12-07 | Coding over Sets for DNA Storage | In this paper we study error-correcting codes for the storage of data in
synthetic deoxyribonucleic acid (DNA). We investigate a storage model where a
data set is represented by an unordered set of $M$ sequences, each of length
$L$. Errors within that model are a loss of whole sequences and point errors
inside the sequ... | 1812.02936v3 |
2018-12-14 | Computational micromagnetics with Commics | We present our open-source Python module Commics for the study of the
magnetization dynamics in ferromagnetic materials via micromagnetic
simulations. It implements state-of-the-art unconditionally convergent finite
element methods for the numerical integration of the Landau-Lifshitz-Gilbert
equation. The implementatio... | 1812.05931v1 |
2019-01-10 | Multi-Parameter Regression Survival Modelling: An Alternative to Proportional Hazards | It is standard practice for covariates to enter a parametric model through a
single distributional parameter of interest, for example, the scale parameter
in many standard survival models. Indeed, the well-known proportional hazards
model is of this kind. In this paper we discuss a more general approach whereby
covaria... | 1901.03277v1 |
2019-02-01 | A Penrose-Type Inequality with Angular Momentum and Charge for Axisymmetric Initial Data | A lower bound for the ADM mass is established in terms of angular momentum,
charge, and horizon area in the context of maximal, axisymmetric initial data
for the Einstein-Maxwell equations which satisfy the weak energy condition. If,
on the horizon, the given data agree to a certain extent with the associated
model Ker... | 1902.00501v3 |
2019-02-08 | Field-tuned spin excitation spectrum of $kπ$-skyrmion | We study spin-wave excitation modes of $k\pi$ skyrmion in a magnetic nanodot
under an external magnetic field along $z$-direction using micromagnetic
simulations based on Landau-Lifshitz-Gilbert equation. We find that a
transition of $k\pi$ skyrmion to other skyrmion-like structures appears under
some critical external... | 1902.02901v2 |
2019-02-08 | Simulation of the Magnetization Dynamics of a Single Domain BiFeO$_3$ Thin Film | The switching dynamics of a single-domain BiFeO$_3$ thin films is
investigated through combining the dynamics of polarization and Neel vector.
The evolution of the ferroelectric polarization is described by the
Landau-Khalatnikov (LK) equation, and the Landau-Lifshitz-Gilbert (LLG)
equations for spins in two sublattice... | 1902.03330v1 |
2019-02-13 | Dynamics of ferromagnetic domain walls under extreme fields | We report the existence of a new regime for domain wall motion in uniaxial
and near-uniaxial ferromagnetic nanowires, characterised by applied magnetic
fields sufficiently strong that one of the domains becomes unstable. There
appears a new stable solution of the Landau-Lifshitz-Gilbert equation,
describing a nonplanar... | 1902.04968v3 |
2019-02-28 | Topological $d$-wave Superconductivity and Nodal Line-Arc Intersections in Weyl Semimetals | Superconducting Weyl semimetals present a novel and promising system to
harbor new forms of unconventional topological superconductivity. Within the
context of time-reversal symmetric Weyl semimetals with $d$-wave
superconductivity, we demonstrate that the number of Majorana cones equates to
the number of intersections... | 1903.00024v2 |
2019-03-07 | Stronger L2/L2 Compressed Sensing; Without Iterating | We consider the extensively studied problem of $\ell_2/\ell_2$ compressed
sensing. The main contribution of our work is an improvement over [Gilbert, Li,
Porat and Strauss, STOC 2010] with faster decoding time and significantly
smaller column sparsity, answering two open questions of the aforementioned
work.
Previous... | 1903.02742v1 |
2019-03-17 | A Brief history of mangnetism | In this article an overview of the historical development of the key ideas in
the field of magnetism is presented. The presentation is semi-technical in
nature.Starting by noting down important contribution of Greeks, William
Gilbert, Coulomb, Poisson, Oersted, Ampere, Faraday, Maxwell, and Pierre Curie,
we review earl... | 1903.07031v1 |
2019-03-19 | Separability Properties of Nilpotent $\mathbb{Q}[x]$-Powered Groups | In this paper we study conjugacy and subgroup separability properties in the
class of nilpotent $\mathbb{Q}[x]$-powered groups. Many of the techniques used
to study these properties in the context of ordinary nilpotent groups carry
over naturally to this more general class. Among other results, we offer a
generalizatio... | 1903.08220v1 |
2019-03-24 | Synchronized, periodic, and chaotic dynamics in spin torque oscillator with two free layers | A phase diagram of the magnetization dynamics is studied by numerically
solving the Landau-Lifshitz-Gilbert (LLG) equation in a spin torque oscillator
consisting of asymmetric two free layers that are magnetized in in-plane
direction. We calculated the dynamics for a wide range of current density for
both low and high ... | 1903.09938v2 |
2019-04-07 | Hybrid Approaches to Detect Comments Violating Macro Norms on Reddit | In this dataset paper, we present a three-stage process to collect Reddit
comments that are removed comments by moderators of several subreddits, for
violating subreddit rules and guidelines. Other than the fact that these
comments were flagged by moderators for violating community norms, we do not
have any other infor... | 1904.03596v2 |
2019-04-11 | Triangular array of iron-oxide nanoparticles: A simulation study of intra- and inter-particle magnetism | A study of spherical maghemite nanoparticles on a two dimensional triangular
array was carried out using a stochastic Landau-Lifshitz-Gilbert (sLLG)
approach. The simulation method was first validated with a triangular array of
simple dipoles, where results show the expected phase transition to a
ferromagnetic state at... | 1904.05515v1 |
2019-04-15 | Mathematical analysis of weak and strong solutions to an evolutionary model for magnetoviscoelasticity | The paper is concerned with the analysis of an evolutionary model for
magnetoviscoelastic materials in two dimensions. The model consists of a
Navier-Stokes system featuring a dependence of the stress tensor on elastic and
magnetic terms, a regularized system for the evolution of the deformation
gradient and the Landau... | 1904.07179v1 |
2019-04-25 | Message Randomization and Strong Security in Quantum Stabilizer-Based Secret Sharing for Classical Secrets | We improve the flexibility in designing access structures of quantum
stabilizer-based secret sharing schemes for classical secrets, by introducing
message randomization in their encoding procedures. We generalize the
Gilbert-Varshamov bound for deterministic encoding to randomized encoding of
classical secrets. We also... | 1904.11114v3 |
2019-05-02 | Benchmark Instances and Branch-and-Cut Algorithm for the Hashiwokakero Puzzle | Hashiwokakero, or simply Hashi, is a Japanese single-player puzzle played on
a rectangular grid with no standard size. Some cells of the grid contain a
circle, called island, with a number inside it ranging from one to eight. The
remaining positions of the grid are empty. The player must connect all of the
islands by d... | 1905.00973v1 |
2019-05-06 | An excess of non-Gaussian fluctuations in the cosmic infrared background consistent with gravitational lensing | The cosmic infrared background (CIB) is gravitationally lensed. A
quadratic-estimator technique that is inherited from lensing analyses of the
cosmic microwave background (CMB) can be applied to detect the CIB lensing
effects. However, the CIB fluctuations are intrinsically strongly non-Gaussian,
making CIB lensing rec... | 1905.02084v1 |
2019-05-14 | Multi-reference quantum chemistry protocol for simulating autoionization spectra: Test of ionization continuum models for the neon atom | In this contribution we present a protocol to evaluate partial and total
Auger decay rates combining the restricted active space self-consistent field
electronic structure method for the bound part of the spectrum and numerically
obtained continuum orbitals in the single-channel scattering theory framework.
On top of t... | 1905.05785v2 |
2019-06-16 | A concise guide to existing and emerging vehicle routing problem variants | Vehicle routing problems have been the focus of extensive research over the
past sixty years, driven by their economic importance and their theoretical
interest. The diversity of applications has motivated the study of a myriad of
problem variants with different attributes. In this article, we provide a
concise overvie... | 1906.06750v2 |
2019-07-01 | Formation process of skyrmion lattice domain boundaries: The role of grain boundaries | We report on the formation process of skyrmion lattice (SkL) domain
boundaries in FeGe using Lorentz transmission electron microscopy and
small-angle electron diffraction. We observed that grain boundaries and edges
play an important role in the formation of SkL domain boundaries; The SkL
domain boundary is stabilized ... | 1907.00774v1 |
2019-07-02 | Quantum Data-Syndrome Codes | Performing active quantum error correction to protect fragile quantum states
highly depends on the correctness of error information--error syndromes. To
obtain reliable error syndromes using imperfect physical circuits, we propose
the idea of quantum data-syndrome (DS) codes that are capable of correcting
both data qub... | 1907.01393v1 |
2019-07-02 | Prediction of topological Hall effect in a driven magnetic domain wall | We investigate the possible emergence of topological Hall effect (THE) in a
driven magnetic DW. Numerical simulation based on the
Landau-Lifshitz-Gilbert-Slonczewski (LLGS) equation shows that the emergent
magnetic flux appears when the DW is in a non-equilibrium state. The magnitude
of magnetic flux is modulated by Dz... | 1907.01648v2 |
2019-07-04 | Resonant Acoustic Wave Assisted Spin-Transfer-Torque Switching of Nanomagnets | We report the possibility of achieving an order of magnitude reduction in the
energy dissipation needed to write bits in perpendicular magnetic tunnel
junctions (p-MTJs) by simulating the magnetization dynamics under a combination
of resonant surface acoustic waves (r-SAW) and spin-transfer-torque (STT). The
magnetizat... | 1907.02255v1 |
2019-07-04 | Second-order semi-implicit projection methods for micromagnetics simulations | Micromagnetics simulations require accurate approximation of the
magnetization dynamics described by the Landau-Lifshitz-Gilbert equation, which
is nonlinear, nonlocal, and has a non-convex constraint, posing interesting
challenges in developing numerical methods. In this paper, we propose two
second-order semi-implici... | 1907.02358v1 |
2019-07-11 | Astro2020 Activity, Project of State of the Profession Consideration (APC) White Paper: All-Sky Near Infrared Space Astrometry. State of the Profession Considerations: Development of Scanning NIR Detectors for Astronomy | Gaia is a revolutionary space mission developed by ESA and is delivering 5
parameter astrometry, photometry and radial velocities over the whole sky with
astrometric accuracies down to a few tens of micro-arcseconds. A weakness of
Gaia is that it only operates at optical wavelengths. However, much of the
Galactic centr... | 1907.05191v1 |
2019-07-21 | Performance of a low-parasitic frequency-domain multiplexing readout | Frequency-domain multiplexing is a readout technique for transition edge
sensor bolometer arrays used on modern CMB experiments, including the SPT-3G
receiver. Here, we present design details and performance measurements for a
low-parasitic frequency-domain multiplexing readout. Reducing the parasitic
impedance of the ... | 1907.09035v1 |
2019-08-09 | MakeSense: An IoT Testbed for Social Research of Indoor Activities | There has been increasing interest in deploying IoT devices to study human
behaviour in locations such as homes and offices. Such devices can be deployed
in a laboratory or `in the wild' in natural environments. The latter allows one
to collect behavioural data that is not contaminated by the artificiality of a
laborat... | 1908.03380v1 |
2019-08-13 | On Steane-Enlargement of Quantum Codes from Cartesian Product Point Sets | In this work, we study quantum error-correcting codes obtained by using
Steane-enlargement. We apply this technique to certain codes defined from
Cartesian products previously considered by Galindo et al. in [4]. We give
bounds on the dimension increase obtained via enlargement, and additionally
give an algorithm to co... | 1908.04560v1 |
2019-08-17 | Band-pass Magnetic Tunnel Junction based Magnetoresistive Random Access Memory | We propose spin transfer torque--magnetoresistive random access memory
(STT-MRAM) based on magneto-resistance and spin transfer torque physics of
band-pass spin filtering. Utilizing the electronic analogs of optical phenomena
such as anti-reflection coating and resonance for spintronic devices, we
present the design of... | 1908.06279v1 |
2019-09-09 | Narrow autoresonant magnetization structures in finite length ferromagnetic nanoparticles | The autoresonant approach to excitation and control of large amplitude
uniformly precessing magnetization structures in finite length easy axis
ferromagnetic nanoparticles is suggested and analyzed within the
Landau-Lifshitz-Gilbert model. These structures are excited by using a
spatially uniform, oscillating, chirped ... | 1909.03671v1 |
2019-09-09 | Reliability and Error Burst Length Analysis of Wireless Multi-Connectivity | Multi-connectivity offers diversity in terms of multiple interfaces through
which the data can be sent, thereby improving simultaneously the overall
reliability and latency. This makes interface diversity a natural candidate for
supporting Ultra-Reliable Low Latency Communications (URLLC). This work
investigates how th... | 1909.03875v1 |
2019-09-13 | Hidden spin-orbital order in the Kitaev hyperhoneycomb $β$-Li$_2$IrO$_3$ | We report the existence of a phase transition at high temperature in the 3D
Kitaev candidate material, $\beta$-Li$_2$IrO$_3$. We show that the transition
is bulk, intrinsic and orders a tiny magnetic moment with a spatially
anisotropic saturation moment. We show that even though this transition is
global, it does not f... | 1909.06355v1 |
2019-10-08 | Gravitational Lensing of the Cosmic Neutrino Background | We study gravitational lensing of the cosmic neutrino background. This signal
is undetectable for the foreseeable future, but there is a rich trove of
information available. At least some of the neutrinos from the early universe
will be non-relativistic today, with a closer surface of last scattering
(compared to the c... | 1910.03550v3 |
2019-10-17 | A multi-scale approach for magnetisation dynamics: Unraveling exotic magnetic states of matter | Crystallographic lattice defects strongly influence dynamical properties of
magnetic materials at both microscopic and macroscopic length scales. A
multi-scale approach to magnetisation dynamics, which is presented in this
paper, accurately captures such effects. The method is illustrated using
examples of systems with... | 1910.07807v1 |
2019-10-21 | Generation of exchange magnons in thin ferromagnetic films by ultrashort acoustic pulses | We investigate generation of exchange magnons by ultrashort, picosecond
acoustic pulses propagating through ferromagnetic thin films. Using the
Landau-Lifshitz-Gilbert equations we derive the dispersion relation for
exchange magnons for an external magnetic field tilted with respect to the film
normal. Decomposing the ... | 1910.09481v1 |
2019-11-05 | Numerical methods for antiferromagnetics | Compared with ferromagnetic counterparts, antiferromagnetic materials are
considered as the future of spintronic applications since these materials are
robust against the magnetic perturbation, produce no stray field, and display
ultrafast dynamics. There are (at least) two sets of magnetic moments in
antiferromagnets ... | 1911.01717v1 |
2019-11-08 | A filamentary cascade model of the inertial range | This paper develops a simple model of the inertial range of turbulent flow,
based on a cascade of vortical filaments. A binary branching structure is
proposed, involving the splitting of filaments at each step into pairs of
daughter filaments with differing properties, in effect two distinct
simultaneous cascades. Neit... | 1911.03537v2 |
2019-11-14 | Beyond Pairwise Comparisons in Social Choice: A Setwise Kemeny Aggregation Problem | In this paper, we advocate the use of setwise contests for aggregating a set
of input rankings into an output ranking. We propose a generalization of the
Kemeny rule where one minimizes the number of k-wise disagreements instead of
pairwise disagreements (one counts 1 disagreement each time the top choice in a
subset o... | 1911.06226v2 |
2019-11-15 | A geometric look at momentum flux and stress in fluid mechanics | We develop a geometric formulation of fluid dynamics, valid on arbitrary
Riemannian manifolds, that regards the momentum-flux and stress tensors as
1-form valued 2-forms, and their divergence as a covariant exterior derivative.
We review the necessary tools of differential geometry and obtain the
corresponding coordina... | 1911.06613v2 |
2019-11-18 | Theoretical condition for switching the magnetization in a perpendicularly magnetized ferromagnet via the spin Hall effect | A theoretical formula is derived for the threshold current to switch a
perpendicular magnetization in a ferromagnet by the spin Hall effect. The
numerical simulation of the Landau-Lifshitz-Gilbert equation indicates that
magnetization switching is achieved when the steady-state solution of the
magnetization in the pres... | 1911.07961v1 |
2019-12-11 | Constructions of quasi-twisted quantum codes | In this work, our main objective is to construct quantum codes from
quasi-twisted (QT) codes. At first, a necessary and sufficient condition for
Hermitian self-orthogonality of QT codes is introduced by virtue of the Chinese
Remainder Theorem (CRT). Then we utilize these self-orthogonal QT codes to
provide quantum code... | 1912.05142v2 |
2019-12-12 | The strange metal Hall effect connects quantum criticality and superconductivity in an iron-based superconductor | Many unconventional superconductors exhibit a common set of anomalous charge
transport properties that characterize them as `strange metals', which provides
hope that there is single theory that describes them. However,
model-independent connections between the strange metal and superconductivity
have remained elusive.... | 1912.06130v1 |
2019-12-17 | SINR percolation for Cox point processes with random powers | Signal-to-interference plus noise ratio (SINR) percolation is an
infinite-range dependent variant of continuum percolation modeling connections
in a telecommunication network. Unlike in earlier works, in the present paper
the transmitted signal powers of the devices of the network are assumed random,
i.i.d. and possibl... | 1912.07895v2 |
2019-12-18 | Magnetic hysteresis behavior of granular manganite La$_{0.67}$Ca$_{0.33}$MnO$_3$ nanotubes | A silicon micromechanical torsional oscillator is used to measure the
hysteresis loops of two manganite La_0.67Ca_0.33MnO_3 nanotubes at different
temperatures, applying an external field along its main axes. These structures
are composed of nanograins with a ferromagnetic core surrounded by a dead
layer. Micromagnetic... | 1912.08844v2 |
2019-12-30 | Distribution of the minimal distance of random linear codes | In this paper, we study the distribution of the minimal distance (in the
Hamming metric) of a random linear code of dimension $k$ in $\mathbb{F}_q^n$.
We provide quantitative estimates showing that the distribution function of the
minimal distance is close ({\it{}superpolynomially} in $n$)to the cumulative
distribution... | 1912.12833v2 |
2020-01-12 | Magnetic Skyrmions in FePt Square-Based Nanoparticles Around Room-Temperature | Magnetic skyrmions formed at temperatures around room temperature in
square-based parallelepiped magnetic FePt nanoparticles with perpendicular
magnetocrystalline anisotropy (MCA) were studied during the magnetization
reversal using micromagnetic simulations. Finite Differences (FD) method were
used for the solution of... | 2001.03902v3 |
2020-01-20 | Investigation of Patient-sharing Networks Using a Bayesian Network Model Selection Approach for Congruence Class Models | A Bayesian approach to conduct network model selection is presented for a
general class of network models referred to as the congruence class models
(CCMs). CCMs form a broad class that includes as special cases several common
network models, such as the Erd\H{o}s-R\'{e}nyi-Gilbert model, stochastic block
model and man... | 2001.06974v1 |
2020-02-11 | Fidimag -- a finite difference atomistic and micromagnetic simulation package | Fidimag is an open-source scientific code for the study of magnetic materials
at the nano- or micro-scale using either atomistic or finite difference
micromagnetic simulations, which are based on solving the
Landau-Lifshitz-Gilbert equation. In addition, it implements simple procedures
for calculating energy barriers i... | 2002.04318v1 |
2020-01-13 | Malware propagation in urban D2D networks | We introduce and analyze models for the propagation of malware in pure D2D
networks given via stationary Cox-Gilbert graphs. Here, the devices form a
Poisson point process with random intensity measure $\lambda\Lambda$, where
$\Lambda$ is stationary and given, for example, by the edge-length measure of a
realization of... | 2002.06248v1 |
2020-02-17 | How fast can you update your MST? (Dynamic algorithms for cluster computing) | Imagine a large graph that is being processed by a cluster of computers,
e.g., described by the $k$-machine model or the Massively Parallel Computation
Model. The graph, however, is not static; instead it is receiving a constant
stream of updates. How fast can the cluster process the stream of updates? The
fundamental ... | 2002.06762v1 |
2020-02-22 | Bose-Einstein Condensation of Nonequilibrium Magnons in Confined Systems | We study the formation of a room temperature magnon Bose-Einstein condensate
(BEC) in nanoscopic systems and demonstrate that its lifetime is influenced by
the spatial confinement. We predict how dipolar interactions and nonlinear
magnon scattering assist in the generation of a metastable magnon BEC in
energy-quantized... | 2002.09777v2 |
2020-02-25 | Bias-field-free spin Hall nano-oscillators with an out-of-plane precession mode | Spin Hall nano-oscillators (SHNOs) are promising candidates for new microwave
oscillators with high durability due to a small driving current. However,
conventional SHNOs with an in-plane precession (IPP) mode require a bias field
for stable oscillations which is not favored in certain applications such as
neuromorphic... | 2002.10753v1 |
2020-03-06 | Spin-accumulation induced magnetic texture in a metal-insulator bilayer | We consider the influence of a spin accumulation in a normal metal on the
magnetic statics and dynamics in an adjacent magnetic insulator. In particular,
we focus on arbitary angles between the spin accumulation and the easy-axis of
the magnetic insulator. Based on Landau-Lifshitz-Gilbert phenomenology
supplemented wit... | 2003.03226v1 |
2020-04-05 | Domain wall diode based on functionally graded Dzyaloshinskii-Moriya interaction | We present a general approach for studying the dynamics of domain walls in
biaxial ferromagnetic stripes with functionally graded Dzyaloshinskii-Moriya
interaction (DMI). By engineering the spatial profile of the DMI parameter we
propose the concept of a diode, which implements filtering of domain walls of
certain topo... | 2004.02175v1 |
2020-05-03 | Philosophy-Guided Mathematical Formalism for Complex Systems Modelling | We recently presented the so-called allagmatic method, which includes a
system metamodel providing a framework for describing, modelling, simulating,
and interpreting complex systems. Its development and programming was guided by
philosophy, especially by Gilbert Simondon's philosophy of individuation,
Alfred North Whi... | 2005.01192v5 |
2020-05-07 | A closer look at the non-Hopfianness of $BS(2,3)$ | The Baumslag-Solitar group $BS(2,3)$, is a so-called non-Hopfian group,
meaning that it has an epimorphism $\phi$ onto itself, that is not injective.
In particular this is equivalent to saying that $BS(2,3)$ has a non-trivial
quotient that is isomorphic to itself. As a consequence the Cayley graph of
$BS(2,3)$ has a qu... | 2005.03396v2 |
2020-05-08 | Project and Forget: Solving Large-Scale Metric Constrained Problems | Given a set of dissimilarity measurements amongst data points, determining
what metric representation is most "consistent" with the input measurements or
the metric that best captures the relevant geometric features of the data is a
key step in many machine learning algorithms. Existing methods are restricted
to specif... | 2005.03853v2 |
2020-05-27 | The Kirillov model in families | Let $F$ be a non-archimedean local field, let $k$ be an algebraically closed
field of characteristic $\ell$ different from the residual characteristic of
$F$, and let $A$ be a commutative Noetherian $W(k)$-algebra, where $W(k)$
denotes the Witt vectors. Using the Rankin-Selberg functional equations and
extending recent... | 2005.13484v3 |
2020-05-29 | An Explicit Formula for the Zero-Error Feedback Capacity of a Class of Finite-State Additive Noise Channels | It is known that for a discrete channel with correlated additive noise, the
ordinary capacity with or without feedback both equal $ \log q-\mathcal{H} (Z)
$, where $ \mathcal{H}(Z) $ is the entropy rate of the noise process $ Z $ and
$ q $ is the alphabet size. In this paper, a class of finite-state additive
noise chan... | 2006.00892v1 |
2020-06-01 | BBN constraints on dark radiation isocurvature | The existence of dark radiation that is completely decoupled from the
standard model in the early Universe leaves open the possibility of an
associated dark radiation isocurvature mode. We show that the presence of dark
radiation isocurvature leads to spatial variation in the primordial abundances
of helium and deuteri... | 2006.01165v2 |
2020-06-12 | Enhanced Stability of Antiferromagnetic Skyrmion during Its Motion by Anisotropic Dzyaloshinskii Moriya Interaction | Searching for new methods to enhance the stability of antiferromagnetic (AFM)
skyrmion during its motion is an important issue for AFM spintronic devices.
Herein, the spin polarized current-induced dynamics of a distorted AFM skyrmion
is numerically studied, based on the Landau Lifshitz Gilbert simulations of the
model... | 2006.06938v1 |
2020-07-02 | Spectral Methods for Ranking with Scarce Data | Given a number of pairwise preferences of items, a common task is to rank all
the items. Examples include pairwise movie ratings, New Yorker cartoon caption
contests, and many other consumer preferences tasks. What these settings have
in common is two-fold: a scarcity of data (it may be costly to get comparisons
for al... | 2007.01346v1 |
2020-07-23 | High Precision Real Time Collision Detection | Collision detection and collision avoidance are essential components in these
systems for safe human-robot interactions. Robotics systems that can work
"out-of-the-box" without excessive amount of installation and calibration from
the experts is highly ideal. For this, we propose a generic, high precision,
collision de... | 2007.12045v2 |
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