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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…

介观与纳米尺度物理 · 物理学 2019-04-19 Tomohiro Taniguchi

We present a comprehensive theoretical analysis of magnetic heterostructures composed of ferromagnetic (FM) layers interfaced with three-dimensional topological insulators (TIs). Integrating out the topological surface states and computing…

介观与纳米尺度物理 · 物理学 2026-01-13 Christian Svingen Johnsen , Asle Sudbø

We investigated the effect of using a synthetic ferrimagnetic (SyF) free layer in MgO-based magnetic tunnel junctions (MTJs) on current-induced magnetization switching (CIMS), particularly for application to spin-transfer torque random…

In this work, we have studied the spin dynamics of a synthethic Antiferromagnet (SAFM)$|$Heavy Metal (HM)$|$Ferromagnet (FM) double barrier magnetic tunnel junction (MTJ) in presence of Ruderman-Kittel-Kasuya-Yoside interaction (RKKYI),…

超导电性 · 物理学 2023-10-30 Reeta Devi , Nimisha Dutta , Arindam Boruah , Saumen Acharjee

We study the Kondo lattice model with the Heisenberg-type RKKY-exchange coupling among localized f-spins in the presence of a magnetic field. By means of an extended dynamical mean field theory combined with the non-crossing approximation,…

强关联电子 · 物理学 2009-11-11 Takuma Ohashi , Sei-ichiro Suga , Norio Kawakami

We have measured spin transfer-induced dynamics in magnetic nanocontact devices having a perpendicularly magnetized Co/Ni free layer and an in-plane magnetized CoFe fixed layer. The frequencies and powers of the excitations agree well with…

We theoretically study a finite size $SF_1NF_2$ spin valve, where a normal metal ($N$) insert separates a thin standard ferromagnet ($F_1$) and a thick half-metallic ferromagnet ($F_2$). For sufficiently thin superconductor ($S$) widths…

超导电性 · 物理学 2018-03-12 Klaus Halterman , Mohammad Alidoust

Placing a suitable spacer layer between two magnetic layers can lead to an interaction between the magnetic layers known as Ruderman-Kittel-Kasuya-Yosida (RKKY) coupling. Controlling RKKY coupling, particularly the ability to switch between…

We consider a synthetic antiferromagnetic spin-torque oscillator with anisotropic interlayer exchange coupling. This system exhibits exceptional points in its linearized dynamics. We find the non-linear dynamics and the dynamical phase…

介观与纳米尺度物理 · 物理学 2023-02-16 R. A. Duine , V. Errani , J. S. Harms

An electric current in the presence of spin-orbit coupling can generate a spin accumulation that exerts torques on a nearby magnetization. We demonstrate that, even in the absence of materials with strong bulk spin-orbit coupling, a torque…

Using a multilayer structure containing (cobalt detector layer)/(copper spacer)/(Permalloy source layer), we show experimentally how the non-reorientable spin-orbit torque generated by the Permalloy source layer (the component of spin-orbit…

介观与纳米尺度物理 · 物理学 2021-08-25 Joseph A. Mittelstaedt , Daniel C. Ralph

DC current induced magnetization reversal and magnetization oscillation was observed in 500 nm large size Co90Fe10/Cu/Ni80Fe20 pillars. A perpendicular external field enhanced the coercive field separation between the reference layer…

介观与纳米尺度物理 · 物理学 2017-04-05 Linqiang Luo , Mehdi Kabir , Nam Dao , Salinporn Kittiwatanakul , Michael Cyberey , Stuart A. Wolf , Mircea Stan , Jiwei Lu

Spin-transfer torque and current induced spin dynamics in spin-valve nanopillars with the free magnetic layer located between two magnetic films of fixed magnetic moments is considered theoretically. The spin-transfer torque in the limit of…

介观与纳米尺度物理 · 物理学 2010-04-12 Pavel Balaz , Martin Gmitra , Jozef Barnas

Ferromagnetic (FM) layers separated by nonmagnetic metallic spacer layers can exhibit Ruderman Kittel Kasuya Yosida (RKKY) coupling which may lead to a stable synthetic antiferromagnetic (SAF) phase. In this article we study magnetization…

Ferrimagnets (FIMs) can function as high-frequency antiferromagnets while being easy to detect as ferromagnets, offering unique opportunities for ultrafast device applications. While the physical behavior of FIMs near the compensation point…

介观与纳米尺度物理 · 物理学 2022-02-09 Mingda Guo , Hantao Zhang , Ran Cheng

Ferrimagnet (FiM), (FeCo)1-xGdx, attracts research attention due to its ultrafast magnetic dynamics and finite net magnetization. Incorporating FiM into the magnetic tunnel junction will be beneficial to further improve the writing speed of…

介观与纳米尺度物理 · 物理学 2024-01-04 Xue Zhang , Zhengde Xu , Jie Ren , Yixiao Qiao , Weijia Fan , Zhifeng Zhu

We present theoretical description of the precessional switching processes induced by simultaneous application of spin-polarized current and external magnetic field to antiferromagnetic component of the "pinned" layer. We found stability…

其他凝聚态物理 · 物理学 2013-05-29 Helen V. Gomonay , Vadim M. Loktev

We study the magnetic damping in the simplest of synthetic antiferromagnets, i.e. antiferromagnetically exchange-coupled spin valves in which applied magnetic fields tune the magnetic configuration to become noncollinear. We formulate the…

介观与纳米尺度物理 · 物理学 2015-08-07 Takahiro Chiba , Gerrit E. W. Bauer , Saburo Takahashi

In this work we report observation of in-plane current induced out-of-plane magnetic field driven torque in spin valve structure. Since ferromagnet has high spin orbit coupling it is expected to be the source of spin-orbit-torque as it…

介观与纳米尺度物理 · 物理学 2018-06-27 Arnab Bose , Duc Duong Lam , Swapnil Bhuktare , Sutapa Dutta , Hanuman Singh , Shinji Miwa , Ashwin A. tulapurkar

The spin-torque ferromagnetic resonance (ST-FMR) in a bilayer system consisting of a magnetic insulator such as Y3Fe5O12 and a normal metal with spin-orbit interaction such as Pt is addressed theoretically. We model the ST-FMR for all…

介观与纳米尺度物理 · 物理学 2015-03-03 Takahiro Chiba , Michael Schreier , Gerrit E. W. Bauer , Saburo Takahashi