bluuebunny/crossref_metadata_2025_split huggingface dataset:
Polarization selection in Mössbauer reflectivity for magnetic multilayer investigation
Authors: Andreeva M A , Baulin R A , Slinko O V , Häggström L , Asadchikov V E , Karimov D N , Roshchin B S , Ponomarev D A , Romashev L N , Chumakov A I , Bessas D , Rüffer R 
Published: November 2019

Abstract
Mössbauer reflectivity experiment with polarization selection are reported. The use of the LiF polarization analyzer allows us to get the π→σ’ peak on the reflectivity curve at the critical angle and Mössbauer π→σ’ reflectivity spectra of reasonable quality at the critical angle and also at the Bragg angles of superlattice. The impressive difference of the reflectivity spectra measured near the critical angle with and without polarizations analysis is observed for [57Fe10/V10]20 multilayer characterizing by the ferromagnetic interlayer coupling. The combined fit of the whole set of spectra measured at different angles reveals the existence of antiferromagnetic Fe oxide phases in the top three bilayers. The experiment demonstrates benefits of the Mössbauer reflectivity with polarization analysis in ultrathin surface layer investigations.
Magnetic anisotropy and magnetoelastic properties of Fe10Ni90 films
Authors: Kudyukov E V , Balymov K G , Vas’kovskiy V O 
Published: November 2019

Abstract
This work is devoted to studying the effect of the thickness and type of the buffer sublayer on the magnetic anisotropy and the magnetoelastic properties of Fe10Ni90 films. It is established that the anisotropy of Fe films strongly depends on thickness, which can be associated with the influence of several mechanisms of anisotropy formation. Measurements of the magnetostriction of thin films using magnetoresistive curves were made. The value of the magnetostriction constant also depends on the thickness of the films.
The dimensional crossover in critical behavior of layered XY-model
Authors: Popov Ivan S , Popova Anna P , Prudnikov Pavel V 
Published: November 2019

Abstract
The study of critical properties and size transition in a diluted layered XY-model was carried out for the first time. The dimensional dependence of the temperature T
BKT(p, N) of the Berezinskii-Kosterlitz-Thouless phase transition on the system thickness N is obtained for a diluted layered XY-model for a wide range of spin concentrations p. The temperature T, concentration p, and dimensional N dependencies of the vortex density v(p, N, T) in a layered XY-model are obtained.
Magnetic state and magnetic hysteresis in the molybdenum diselenide intercalated with chromium atoms
Authors: Pleshchev V G , Neznakhin D S , Flyagin V S , Selezneva N V 
Published: November 2019

Abstract
In this work intercalated compounds in the Cr-MoSe2 system were synthesized for the first time. Their magnetic properties are studied at various intercalant concentrations, temperatures and magnetic fields. The temperature dependences of effective magnetic moments and positive paramagnetic Curie temperatures in the paramagnetic region evidence the feasible ferromagnetic interactions between intercalated atoms. The existence of low-temperature ferromagnetic state in CrxMoSe2 is confirmed by hysteresis phenomena in temperature dependences magnetic susceptibility and field dependences of magnetization. The change in the magnetic state affects the character of the temperature dependences of the resistivity.
Complex application of magnetic and magnetoacoustic parameters in the structuroscopy of ferromagnetic materials
Authors: Kostin V N , Serbin E D , Vasilenko O N 
Published: November 2019

Abstract
The set of magnetic parameters and amplitude-frequency spectral characteristics of magnetoacoustic emission (MAE) of a large group of metal ferromagnetic materials differing in their physical properties and size are investigated. It is shown that the change in critical fields determined by the shape of the magnetization curve and the hysteresis loop of bulk samples with an increase in the annealing temperature of cold-deformed steel 20G is 1.5–3 times greater than the change in such well-known parameters for estimating the stress-strain state, such as coercive force and residual magnetic induction. It has been established that the amplitude of magnetoacoustic emission correlates with the residual magnetic induction, which makes it possible to recommend the complex application of these testing parameters in scanning systems of structuroscopy of ferromagnetic materials.
Phonon anomaly in Sm2BaNiO5
Authors: Klimin S A , Popova E A , Popova M N 
Published: November 2019

Abstract
We present low-temperature far-infrared study of Sm2BaNiO5. The lowest-frequency phonon of Sm2BaNiO5 generated by the motion of the Sm3+ ion demonstrates anomalous behaviour at temperatures lower than the Néel temperature, T<T
N=55 K. This phonon hardens at the magnetic ordering although its frequency shift does not follow the magnetic order parameter. The observed phenomenon is responsible for an unusual dielectric response of Sm2BaNiO5 reported in the literature. A correlation between the temperature behaviour of crystal-field levels and the phonon anomaly is discussed.
Terahertz modulation of the Cotton-Mouton effect
Authors: Barsaume S , Mashkovich E A , Grishunin K A , Telegin A V , Sukhorukov Y P , Christianen P C M , Rasing Th , Kimel A V 
Published: November 2019

Abstract
The ultrafast dynamics of the magneto-optical response triggered in the ferromagnetic semiconductor CdCr2Se4 by an intense nearly single cycle THz pulse is investigated. The dependence on the strength and the polarity of the external magnetic field, and the polarization of the THz pulse can be explained by a phenomenological expression that attributes the observed dynamics to the Cotton-Mouton effect at THz frequencies.
Structure and magnetic properties of LiNi1-xCoxPO4 magnetoelectrics with x = (0, 0.1, and 0.2)
Authors: Semkin M A , Urusova N V , Lee S , Kalinkin M O , Kuznetsov D K , Kulesh N A , Neznakhin D S , Kellerman D G , Pirogov A N 
Published: November 2019

Abstract
We present the magnetic properties of LiNi1-xCoxPO4 magnetoelectrics, with x = (0–0.2), and their analysis of concentration dependences. Samples have been synthesized by a glycerol-nitrate method. To refine crystal structure X-ray diffraction measurements were carried out. Magnetic measurements were performed at the external magnetic field of 500 Oe over the temperature range (2–300) K. The neutron powder diffraction patterns of LiNi0.9Co0.1PO4 were recorded over temperature interval from 4.4 K up to 25 K. The partial doping in the LiNi1-xCoxPO4 magnetoelectrics the Ni ions for Co ions leads to a narrowing of the temperature interval where the incommensurate phase is established.
Effect of particle diameter and packing density on heating of metallic iron particles in alternating magnetic field
Authors: Krekhno Roman V , Safronov Alexander P , Beketov Igor V 
Published: November 2019

AbstractThe heat losses originated from the electro-magnetic absorption in mechanically packed metallic iron nano- and micro-sized magnetic particles (MPs) and in magnetic epoxybased composites with embedded MPs were studied by Calvet microcalorimetry. Nano-sized MPs with numerical average diameter 40 nm were synthesized by electrical explosion of wire method; micro-sized MPs with numerical average diameter 2 μm were synthesized by flame decomposition of the iron pentacarbonyl. The specific loss power (SLP) of re-magnetization of press-packed powdered samples and epoxy composites in magnetic field 1750 A/m at 214 kHz was measured as a function of the volume fraction of MPs in the sample. The results showed up that SLP depended both on particle size and on volume fraction, which meant the significant effect of magnetic interaction among particles on the heat losses in electromagnetic absorption.
Stratification of ferroparticles caused by gravitational and magnetic fields in soft ferronematics
Authors: Petrov Danil A , Makurin Alexey V 
Published: November 2019

Abstract
In the framework of continuum theory we study the magnetic particles stratification caused by gravitational and magnetic fields in ferronematic, i.e., a highly dispersed suspension of ferroparticles in a nematic liquid crystal. We consider the so-called soft ferronematic, where the coupling energy between the liquid crystal and the particle surfaces is finite, which allows to consider the director and magnetization of the ferronematic as independent variables. We show how under the influence of an external uniform magnetic field due to the segregation effect heavy impurity ferromagnetic particles begin to float up in a lower-density fluid, moving opposite to the gravity field. As an example, several types of suspensions with material parameters corresponding to actually synthesized ferronematics with different ratios between the two competing mechanisms of separation of impurity particles (segregation and gravity) are considered.
Influence of temperature on the impurity-induced s± → s++ transition in the two-band model for Fe-based superconductors
Authors: Shestakov Vadim , Korshunov Maxim M 
Published: November 2019

Abstract
In Fe-based superconducting materials, the s
± state with the sign-changing gap in the clean limit could be changed to the sign-conserving s
++ state by nonmagnetic impurities. Previous results are obtained for the fixed temperature well below the superconducting critical temperature Tc
. We study how the increasing temperature affects the transition between s
± and s
++ states in the two-band model. The calculations show that the s
± → s
++ transition appears to be dependent on temperature T, i.e. there exists a narrow range of impurity scattering rates, where the s
++ state in dirty superconductor at low temperature is transformed back to the s
± state by increasing T. With the nonmagnetic impurity scattering rate increasing, the temperature of such a reverse transition is shifted to Tc
, while the s
++ state remains solely one for higher degree of disorder.
Spin-fluctuation mechanism of superconductivity in Ba(Fe1-xCox)2As2 ferropnictides
Authors: Karakozov A E , Magnitskaya M V , Mikheenkov A V , Kadyrov L S , Gorshunov B P 
Published: November 2019

Abstract
Gap structure and spin-fluctuation pairing mechanism in the iron-based superconductors Ba(Fe1-xCox)2As2 is studied. We demonstrate that the overdoped compounds Ba(Fe1-xCox)2As2 have a three-gap structure with substantially different order parameters and a weak interband spin-fluctuation coupling. In the three-gap state of Ba(Fe1-xCox)2As2, the anisotropic electronic gap has an intermediate value between two isotropic hole gaps. During transition to the optimal regime, the electron gap strongly increases (by a factor of two) and gets close to the largest hole gap value, while the electron gap anisotropy sharply decreases pointing to a strong increase in the interband interaction, with spin fluctuations accompanying the antiferromagnetic transition. The same two-gap state with close values of the electron and largest hole gaps is preserved even with further decrease in doping. The performed study shows that the spin-fluctuation pairing mechanism has a significant effect on doping evolution of the electron gap only. The doping evolution of the dominant hole gap in Ba(Fe1-x
Co
x
)2As2 is not directly related to the evolution of the spin fluctuations.
Electronic structure of BaBiOß: QMC CT-INT algorithm
Authors: Lukyanov Alexander , Neverov Vyacheslav , Krasavin Andrey , Zhumagulov Yaroslav 
Published: November 2019

Abstract
The continuous time quantum Monte Carlo algorithm with interaction expansion is implemented for Hubbard-Holstein model. Algorithm is approbated on the Bethe lattice with exact diagonalization technique and then is applied to calculate the self-energy of the BaBiO3 compound.
First-principles study of the structure and properties of Fe-Rh-Ir alloys
Authors: Pavlukhina O O , Sokolovskiy V V , Buchelnikov V D , Zagrebin M A 
Published: November 2019

Abstract
The magnetic and structural properties of FeRh1-xIrx (x = 0.125, 0.25, 0.375, and 0.5) alloys were studied using ab initio calculations. The two structure types (CuAu and CsCl) were considered. The equilibrium lattice parameters, total energy and magnetic moments as well as total and partial densities of states for Fe-Rh-Ir with different magnetic ordering were obtained. It is shown that the CuAu-type structure with AF-III configuration is energetically favourable for all compositions under study. The spin polarization at the Fermi level for FeRh0.125Ir0.875 ordered ferromagnetically is found to be 85 %.
Multicomponent alloys with thermally, mechanically and magnetically controlled shape memory effects
Authors: Okulov A V , Belosludtseva E S , Kuranova N N , Marchenkova E B , Pushin A V , Pushin V G 
Published: November 2019

Abstract
This paper presents a brief review of the systematic study of the influence of the chemical composition on the structure, phase transformations and physical properties of binary and quasi-binary Ti-Ni, TiNi-TiFe, TiNi-NiCu, NiMn-NiGa and Ni2MnGa-Ni3Ga systems, which undergo thermoelastic martensitic transformations (TMT) and related with them thermally, mechanically, or magnetically controlled shape memory effects (SME). The effect of alloying with a third component on the behavior of critical temperatures and the TMT sequence has been established, and their generalized diagrams have been constructed. It is shown that the morphology of thermoelastic martensite is a hierarchy of packets of thin coherent crystals.
Quantization of the anomalous Hall conductance in a disordered magnetic Chern insulator
Authors: Novokshonov Sergey 
Published: November 2019

Abstract
The intrinsic anomalous Hall conductance

σ

x
y

int

of a minimal model of the twodimensional disordered Chern insulator is investigated in the framework of Kubo quantum theory of linear response. The electron momentum relaxation is assumed to be due to electron scattering by Gaussian white-noise potential. The explicit expressions for the density of states and

σ

x
y

int

are obtained in the self-consistent Born approximation. The numerical analysis of these expressions at the different values of parameters of the considered model shows that calculated

σ

x
y

int

takes a quantized value e
2/4πħ when the Fermi level lies within the energy gap. This gap is narrowed as disorder increases that leads to decreasing of the Hall plateau width.
Inhomogeneuos state of ferrimagnetic film near compensation point
Authors: Kudasov Yu B , Kozabaranov R V 
Published: November 2019

Abstract
Recently, an investigation of the Faraday rotation in thin iron garnet film (LuBi)3(FeAlGa)5O12 revealed an unusual “precursor” of transition to a noncollinear phase. It was observed in the vicinity of the compensation temperature. However, this feature cannot be ascribed to the uniform phase transition associated with uniaxial anisotropy. A model for the “precursor” based on inhomogeneous magnetic structure at the substrate-film interface is presented. To interpret the Faraday rotation, two diamagnetic optical transitions attributed to tetrahedral and octahedral iron sublattices are considered.
Thickness dependences of coercivity in three layer films obtained by chemical deposition
Authors: Chzhan A V , Podorozhnyak S A , Shahov A N , Velikanov D A , Patrin G S 
Published: November 2019

Abstract
The change of the coercivity Hc of three-layer films obtained by chemical deposition depending on the thickness of the nonmagnetic interlayers and magnetic layers are presented. Structures with magnetically identical soft layers, as well as with significantly different HC values were investigated. It was established that in both cases thecoercivity decreases with the interlayer thickness increasing by an exponential law. It is consistent with a change in the displacement field of the hysteresis loop. The observed changes in the parameters of the hysteresis loop are associated with the roughness of the interfaces.
Magnetic, electric properties and hardness of 17-4 PH stainless steel fabricated by selective laser melting
Authors: Stashkov A , Schapova E , Tsar’kova T , Sazhina E , Bychenok V , Fedorov A , Kaigorodov A , Ezhov I 
Published: November 2019

Abstract
This research examines 17-4 PH stainless steel (SS) samples fabricated by selective laser melting (SLM). The samples were built in vertical direction, and it was necessary to load powder three times. This made the process suspended and led to the changes in temperature conditions. Despite a continuity of the samples, the samples were divided into three parts shared by visible interfaces. The samples were examined by optical microscopy and X-ray diffraction (XRD) analysis. The XRD data showed variations in phase compositions over the samples height. Magnetic and electric properties, hardness and microhardness of the samples in each parts were determined before and after the heat treatment (650 °C for 1 hour, cooling in a furnace). Obtained results show an inhomogeneity of properties over the samples height, but heat treatment led these properties to be uniformly distributed.
Incommensurate-commensurate magnetic phase transitions in Tb1-xErxNi5 compounds
Authors: Pirogov A , Lee H , Choi Y N , Gerasimov E , Lukoyanov A , Bogdanov S 
Published: November 2019

Abstract
Spontaneous and magnetic field induced incommensurate – commensurate magnetic phase transitions have been studied in Tb1-x
Er
x
Ni5 compounds near the critical concentration x
c = 0.125. Compounds crystallize in the hexagonal CaCu5 type phase (P6/mmm space group). In compounds with x ≥ x
c the magnetic order is a commensurate ferromagnetic one. The samples with x < x
c have an incommensurate structure that is a fan like magnetic structure and described by two propagation vectors. An incommensurate – “lock in” magnetic transition takes place at 10 K at cooling regime.
Modeling of magnetoimpedance effect in nanostructured multilayered films
Authors: Buznikov N A , Kurlyandskaya G V 
Published: November 2019

Abstract
The magnetoimpedance effect in nanostructured multilayers is studied theoretically. The multi-layered film structure consists of highly conductive non-magnetic central layer and two external multilayers containing soft magnetic layers of the same thickness separated either by magnetic spacers of different kind or by non-magnetic spacers. In order to describe the magnetoimpedance in the multilayer an electrodynamic model is proposed. The influence of geometric parameters and physical properties of the layers on the magnetoimpedance response is analyzed. The results obtained could be useful both for better understanding of high-frequency behavior of nanostructured multilayers and for optimization of multilayer parameters aiming to enhance the magnetoimpedance effect for practical applications.
Calculation of SWR spectra in two- and three-layer magnetic films
Authors: Bazhanov A G , Zyuzin A M 
Published: November 2019

Abstract
In the present work, the calculation and experimental studies of the spin-wave resonance (SWR) spectra in two- and three-layer magnetic films with dissipative or mixed spin pinning mechanisms are carried out. The calculation showed that the SWR spectra for two-layer ferrite-garnet films have approximately twice the number of spin-wave (SW) modes compared to three-layer films on the same field interval, which is confirmed by experiment. An increase in the mismatch of the dispersion dependences is shown for perpendicular and parallel orientations for a three-layer film compared to a two-layer film. The SW-mode linewidth 2ΔHn
in three-layer films is approximately twice as wide in two-layer films for identical values of the wave number.
Technology features of creating InSb-based spin-valve
Authors: Tsvelikhovskaya V M , Viglin N A , Patrakov E I , Kamenskii I Y , Maksimova I K 
Published: November 2019

Abstract
Technological route is reported how to fabricate an InSb spin device for studying spin-transport phenomena in CPP geometry. The device, which consists of ferromagnetic CoFe layer and MgO tunnel barrier deposed on the n-InSb single-crystal substrate, was manufacturing by method of contact photolithography with lift-off technology of drawing transfer in the topological layers. The optimal methods for preparation of InSb substrate surface and photoresist exposure parameters are found by measuring the voltage between InSb and ferromagnetic probe (Hanle effect) that appears due to the spin polarization of electrons injected from ferromagnet into InSb.
Investigation of the magnetic and adsorption properties of a FexNi1-x monolayer film on nonmagnetic metal substrates
Authors: Mamonova M V , Prudnikova I A 
Published: November 2019

Abstract
The adsorption energy of FexNi1-x monolayer film on the W, Ag and Au nonmagnetic substrates at low Miller index orientations of its surface face is calculated by the variational method of the spin-density functional (SDFT), depending on the concentration of the alloy components and the coating parameter. The temperature effects of the mixing of adsorbate and substrate atoms and the inhomogeneous distribution of magnetization are taken into account. Comparison of the values of the adsorption energy as a function of the concentration of the alloy components calculated at θ = 1 T = 0K within the framework of the variational and first-principle (VASP) approaches is presented.
Electronic properties of WTe2 and MoTe2 single crystals
Authors: Domozhirova A N , Makhnev A A , Shreder E I , Naumov S V , Lukoyanov A V , Chistyakov V V , Huang J C A , Semiannikova A A , Korenistov P S , Marchenkov V V 
Published: November 2019

Abstract
WTe2 and MoTe2 single crystals were grown, and their electrical resistivity in the temperature range from 80 K to 300 K, optical properties at room temperature in the spectral range of 0.17-5.0 eV were studied as well as theoretical calculations of the electronic structure were performed. It is shown that the temperature dependence of the electrical resistivity of orthorhombic WTe2 has a metallic type with resistivity value of (0.5-1) mOhmcm, while hexagonal MoTe2 has a semiconductor one and resistivity value (0.5-1) Ohmcm, which is three orders of magnitude larger than the resistivity of WTe2. Optical properties indicated that there is no contribution from free carriers in the entire spectral range studied. The calculated densities of the electronic states of MoTe2 and WTe2 showed the presence of a bunch of the molybdenum and tungsten electronic states in a wide energy interval with strong admixing of tellurium states. In the WTe2 compound, the larger number of the electronic states is located near the Fermi energy, characterizing a more metallic state in this compound as compared to MoTe2.
Spin current polarization and electrical conductivity in metal helimagnets
Authors: Ustinov V , Bebenin N , Yasyulevich I 
Published: November 2019

Abstract
The peculiarities of spin and charge kinetics in helical magnetic metals that are due to forces acting on the magnetic moment of conduction electrons in inhomogeneous magnetic field have been considered. Analyzing the equations of motion for non-equilibrium spin density shows that an electric field directed along the axis of the helix produces conduction-electron spin polarization along this direction. Under the same conditions, the directions of polarization of the spin current and polarization of the locally equilibrium spin density are collinear. The specific structure of the effective exchange field acting on the conduction electrons in helical magnets causes two additional spin relaxation mechanisms to emerge. In addition to the mechanism of spin-lattice relaxation, “diffusion” and “precession” mechanisms of spin relaxation exist in conductive helical magnets. The diffusion mechanism is analogous to the Dyakonov-Perel spin relaxation mechanism. The key point is that the inhomogeneities of a magnetic field initiate a coupling between the spin and charge systems. It has been shown that, in a helical metal, the electrical conductivity decreases due to the action of the non-uniform exchange magnetic field.