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We report on the evolution of ferromagnetic domain walls during magnetization reversal in elastically coupled ferromagnetic-ferroelectric heterostructures. Using optical polarization microscopy and micromagnetic simulations, we demonstrate…

Materials Science · Physics 2012-10-25 Kévin J. A. Franke , Tuomas H. E. Lahtinen , Sebastiaan van Dijken

The performance of permanent magnets is intricately tied to their magnetic hysteresis loop. In this study, we investigate the heavy-fermion ferromagnet CeAgSb$_2$ through magnetization measurements under uniaxial stress. We observe a 2400 %…

Strongly Correlated Electrons · Physics 2024-10-30 Bin Shen , Franziska Breitner , Philipp Gegenwart , Anton Jesche

We investigated the evolution of ferromagnetism in layered Fe$_3$GeTe$_2$ flakes under different pressures and temperatures using in situ magnetic circular dichroism (MCD) spectroscopy. We found that the rectangle shape of hysteretic loop…

Mesoscale and Nanoscale Physics · Physics 2020-05-08 Heshen Wang , Runzhang Xu , Cai Liu , Le Wang , Zhan Zhang , Huimin Su , Shanmin Wang , Yusheng Zhao , Zhaojun Liu , Dapeng Yu , Jia-Wei Mei , Xiaolong Zou , Jun-Feng Dai

We apply an analysis of time-dependent spin-polarized current in a semiconductor channel at room temperature to establish how the magnetization configuration and dynamics of three ferromagnetic terminals, two of them biased and third…

Mesoscale and Nanoscale Physics · Physics 2008-02-20 L. Cywinski , H. Dery , L. J. Sham

We study the effect of varying wiring in excitable random networks in which connection weights change with activity to mold local resistance or facilitation due to fatigue. Dynamic attractors, corresponding to patterns of activity, are then…

Disordered Systems and Neural Networks · Physics 2009-05-22 Samuel Johnson , J. Marro , Joaquin J. Torres

This paper describes a model for magnetization reversal in polycrystalline Ferromagnetic/Antiferromagnetic exchange biased bilayers. We assume that the exchange energy can be expanded into cosine power series. We show that it is possible to…

Materials Science · Physics 2009-11-10 D. Spenato , S. P. Pogossian , H. Le Gall

The influence of hydrostatic pressure and ab-plane strain on the magnetic structure of FeTe is investigated from first principles. The results of calculations reveal a phase transition from antiferromagnetic double-stripe ordering at…

Superconductivity · Physics 2014-02-11 A. Ciechan , M. J. Winiarski , M. Samsel-Czekała

Magnetization dynamics in a ferromagnet can induce a spin-dependent electric field through spin motive force. Spin current generated by the spin-dependent electric field can in turn modify the magnetization dynamics through spin-transfer…

Mesoscale and Nanoscale Physics · Physics 2012-05-29 Kyoung-Whan Kim , Jung-Hwan Moon , Kyung-Jin Lee , Hyun-Woo Lee

The temperature dependent stability of the magnetic phases of FeRh were investigated by means of total energy calculations with magnetic disorder treated within the uncompensated disordered local moment (uDLM) approach. In addition, Monte…

Materials Science · Physics 2016-02-03 S. Polesya , S. Mankovsky , D. Ködderitzsch , J. Minár , H. Ebert

Kinetics of polymorphous "gamma"-"alfa" transformation in Fe is studied numerically within a model taking into account both lattice and magnetic degrees of freedom, based on first-principle calculations of the total energy for different…

Materials Science · Physics 2013-03-21 I. K. Razumov , Yu. N. Gornostyrev , M. I. Katsnelson

The chiral magnets with topological spin textures provide a rare platform to explore topology and magnetism for potential application implementation. Here, we study the magnetic dynamics of several spin configurations on the monoaxial…

Strongly Correlated Electrons · Physics 2023-04-11 Liyuan Li , Haotian Li , Kaiyuan Zhou , Yaoyu Gu , Qingwei Fu , Lina Chen , Lei Zhang , Ronghua Liu

The effects of a weak microwave field in the magnetization dynamics driven by spin-transfer-torque in spin-valves with perpendicular materials have been systematically studied by means of full micromagnetic simulations. In the system we…

Mesoscale and Nanoscale Physics · Physics 2015-05-19 Mario Carpentieri , Giovanni Finocchio , Bruno Azzerboni , Luis Torres

We show that in suitable anisotropic ferromagnets, both stable and metastable ``tilted'' phases occur, in which the magnetization ${\vec M}$ makes an angle between zero and $180$ degrees with the externally applied ${\vec H}$. Tuning either…

Statistical Mechanics · Physics 2010-08-03 Leiming Chen , John Toner

Electric-field induced magnetization switching in multiferroic magnetoelectric devices is promising for beyond Moore's law computing. We show here that interface-coupled multiferroic heterostructures, i.e., a ferroelectric layer coupled…

Mesoscale and Nanoscale Physics · Physics 2015-04-22 Kuntal Roy

It is shown theoretically that a single a few picoseconds long acoustic pulse can reverse magnetization in a magneto-strictive material Terfenol-D. Following giant magneto-elastic changes of free energy density the magnetization vector is…

Materials Science · Physics 2013-06-28 O. Kovalenko , T. Pezeril , V. V. Temnov

Knowledge of the doping (x)-temperature (T) phase diagram of Fe-based superconductors is crucial in understanding the mechanism of high transition temperature superconductivity. Here, we measured the Se doping dependence of the magnetic…

Superconductivity · Physics 2023-06-21 Takenori Fujii , Yu Uezono , Takumi Otsuka , Shotaro Hagisawa , Takao Watanabe

We report pressure-dependent neutron diffraction and muon spin relaxation/rotation measurements combined with first-principles calculations to investigate the structural, magnetic, and electronic properties of BaFe$_2$S$_3$ under pressure.…

We present a detailed numerical analysis of the effect of a magnetic field on the transport properties of a `small-$N$' one-sided surface disordered wire. When time reversal symmetry is broken due to a magnetic field $B$, we find a strong…

Mesoscale and Nanoscale Physics · Physics 2016-08-16 A. García-Martín , M. Governale , P. Wölfle

Strong ferromagnetic interlayer exchange couplings $J$ in perpendicularly magnetized systems are becoming increasingly desirable for applications. We study whether ferromagnetic interlayer exchange couplings can be measured by a combination…

Materials Science · Physics 2016-04-22 Thibaut Devolder

We report an electric-field poling study of the geometric-driven improper ferroelectric h-ErMnO$_3$. From a detailed dielectric analysis we deduce the temperature and frequency dependent range for which single-crystalline h-ErMnO$_3$…