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The interlayer antiferromagnetic coupling rare-earth/transition-metal bilayer ferrimagnet systems have attracted much attention because they present variously unusual temperature-and field-dependent nontrivial magnetic states and dynamics.…

介观与纳米尺度物理 · 物理学 2023-04-19 Kaiyuan Zhou , Xiang Zhan , Zishuang Li , Haotian Li , Chunjie Yan , Lina Chen , Ronghua Liu

We present an ab-initio study of the temperature-dependent longitudinal and anomalous Hall resistivities in the compensated collinear ferrimagnet Mn$_{1.5}$V$_{0.5}$FeAl. Its transport properties are calculated using the general fully…

By combining two independent approaches, inelastic neutron scattering measurements and density functional theory calculations, we study the spin-waves in the high-temperature collinear antiferromagnetic phase (AFM2) of Mn$_5$Si$_3$. We…

介观与纳米尺度物理 · 物理学 2021-01-13 F. J. dos Santos , N. Biniskos , S. Raymond , K. Schmalzl , M. dos Santos Dias , P. Steffens , J. Persson , S. Blügel , S. Lounis , T. Brückel

Using the spin-polarized tunneling model and taking into account the basic physics of ferromagnetic semiconductors, we study the temperature dependence of the tunneling magnetoresistance (TMR) in the diluted magnetic semiconductor (DMS)…

强关联电子 · 物理学 2009-11-07 Pin Lyu , Kyungsun Moon

The evolution of information technology has been driven by the discovery of new forms of large magnetoresistance (MR), such as giant magnetoresistance (GMR) and tunnelling magnetoresistance (TMR) in magnetic multilayers. Recently, new types…

应用物理 · 物理学 2020-01-08 Kosuke Takiguchi , Le Duc Anh , Takahiro Chiba , Tomohiro Koyama , Daichi Chiba , Masaaki Tanaka

We present room-temperature measurements of magnon spin diffusion in epitaxial ferrimagnetic insulator MgAl$_{0.5}$Fe$_{1.5}$O$_{4}$ (MAFO) thin films near zero applied magnetic field where the sample forms a multi-domain state. Due to a…

In this work, we experimentally investigate spin and orbital torque phenomena using the spin-torque ferromagnetic resonance (ST-FMR) technique in a series of bilayer systems composed of different normal metal (NM) materials. Permalloy (Py)…

介观与纳米尺度物理 · 物理学 2026-03-26 J. L. Costa , E. Santos , A. Y. M. Tani , J. B. S. Mendes , A. Azevedo

Using the quantum Monte Carlo Loop algorithm, we calculate the temperature dependence of the uniform susceptibility, the specific heat, the correlation length, the generalized staggered susceptibility and magnetization of a spin-1/2 chain…

凝聚态物理 · 物理学 2007-05-23 Beat Frischmuth , Manfred Sigrist , Beat Ammon , Matthias Troyer

We analyze the temperature dependence of the electron spin resonance linewidth above the critical region in exchange-coupled magnetic insulators. The focus is on separating the contributions to the linewidth from spin-spin interactions,…

材料科学 · 物理学 2017-06-27 M. Acikgoz , D. L. Huber

We present a simple technique using a cavity-based resonance spectrometer to quantify the anti-damping torque due to the spin Hall effect. Modification of ferromagnetic resonance is observed as a function of small DC current in sub-mm-wide…

We analyze the complex impact of the local magnetic spin texture on the transverse Hall-type voltage in device structures utilized to measure magnetoresistance effects. We find a highly localized and asymmetric magnetic sensitivity in the…

介观与纳米尺度物理 · 物理学 2022-01-06 F. Schreiber , H. Meer , C. Schmitt , R. Ramos , E. Saitoh , L. Baldrati , M. Kläui

We provide a macroscopic theory and experimental results for magnetic resonances of antiferromagnetically-coupled ferrimagnets. Our theory, which interpolates the dynamics of antiferromagnets and ferromagnets smoothly, can describe…

The temperature dependence of the correlation length, susceptibilities and the magnetic structure factor of the two-dimensional spin-1 square lattice quantum Heisenberg antiferromagnet are computed by the quantum Monte Carlo loop algorithm…

统计力学 · 物理学 2007-05-23 Kenji Harada , Matthias Troyer , Naoki Kawashima

We have studied the relationship between the structure and the spin Hall angle of the early 5d transition metals in X/CoFeB/MgO (X=Hf, Ta, W, Re) heterostructures. Spin Hall magnetoresistance (SMR) is used to characterize the spin Hall…

材料科学 · 物理学 2016-01-20 Jun Liu , Tadakatsu Ohkubo , Seiji Mitani , Kazuhiro Hono , Masamitsu Hayashi

We theoretically investigate tunneling magnetoresistance (TMR) devices, which are probing the spin-momentum coupled nature of surface states of the three-dimensional topological insulator Bi$_{2}$Se$_{3}$. Theoretical calculations are…

介观与纳米尺度物理 · 物理学 2015-01-29 Matthias Götte , Tomi Paananen , Günter Reiss , Thomas Dahm

A large unidirectional magnetoresistance (UMR) ratio of UMR/$R_{xx}\sim$ $0.36\%$ is found in W/CoFeB metallic bilayer heterostructures at room temperature. Three different regimes in terms of the current dependence of UMR ratio are…

介观与纳米尺度物理 · 物理学 2021-08-11 Ting-Yu Chang , Chih-Lin Cheng , Chao-Chung Huang , Cheng-Wei Peng , Yu-Hao Huang , Tian-Yue Chen , Yan-Ting Liu , Chi-Feng Pai

Recent experiments demonstrate that antiferromagnets exhibit the spin Hall effect. We study a tight-binding model of an antiferromagnet on a square lattice with Rashba spin-orbit coupling and disorder. By exact diagonalization of a finite…

介观与纳米尺度物理 · 物理学 2020-05-20 Sverre A. Gulbrandsen , Camilla Espedal , Arne Brataas

In ferromagnetic metals, the interconversion of spin and charge currents via the spin Hall effect and its inverse can depend on the angle between the ferromagnets magnetization and the spin current polarization direction. Here, such a…

材料科学 · 物理学 2019-03-27 Joel Cramer , Andrew Ross , Samridh Jaiswal , Lorenzo Baldrati , Romain Lebrun , Mathias Kläui

Quantum mechanical calculations based on an extended Heisenberg model are compared with ferromagnetic resonance (FMR) experiments on prototype trilayer systems Ni_7/Cu_n/Co_2/Cu(001) in order to determine and separate for the first time…

强关联电子 · 物理学 2009-11-11 S. Schwieger , J. Kienert , K. Lenz , J. Lindner , K. Baberschke , W. Nolting

Spin-torque ferromagnetic resonance (ST-FMR) is a common method used to measure spin-orbit torques (SOTs) in heavy metal/ferromagnet bilayer structures. In the course of a measurement, other resonant processes such as spin pumping (SP) and…

介观与纳米尺度物理 · 物理学 2020-08-19 Saba Karimeddiny , Joseph A. Mittelstaedt , Robert A. Buhrman , Daniel C. Ralph