Propagation of a Laser-Induced Magnetostatic Wave Packet in a Pseudo Spin Valve in the Presence of Spin Pumping

IF 1 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY
A. E. Fedianin, N. E. Khokhlov, A. M. Kalashnikova
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引用次数: 0

Abstract

Spin pumping and angular momentum transfer, i.e., the emission of a spin current by a precessing magnetization and the reverse process of absorption, play an important role in coherent magnetic dynamics processes in multilayered structures. For ferromagnetic layers separated by a nonmagnetic interlayer these effects give rise to a dynamic coupling between the layers that is dissipative in nature and affects the damping of coherent magnetization precession. We have used micromagnetic simulations to analyze the influence of such a dynamic coupling on the propagation of a laser-induced surface magnetostatic wave (MSW) packet in a pseudo spin valve structure consisting of two ferromagnetic metallic layers separated by a nonmagnetic metallic interlayer. We have considered the MSW generation due to laser-induced heating, which leads to dynamic changes in magnetization and magnetic anisotropy, and added the dynamic coupling effect to the equations for our micromagnetic simulations. As a result, we have revealed that under certain conditions such a coupling leads to a decrease in the spatial damping of the wave packet that corresponds to the acoustic MSW mode forming in the structure considered.

Abstract Image

存在自旋泵浦时激光诱导的磁静电波包在伪自旋阀中的传播
摘要自旋抽运和角动量传递,即自旋电流通过预处理磁化的发射和反向吸收过程,在多层结构的相干磁动力学过程中发挥着重要作用。对于被非磁性夹层隔开的铁磁层,这些效应会引起层间的动态耦合,这种耦合具有耗散性质,会影响相干磁化前冲的阻尼。我们利用微磁模拟分析了这种动态耦合对激光诱导的表面磁静电波(MSW)包在伪自旋阀结构中传播的影响,该结构由两个被非磁性金属夹层隔开的铁磁性金属层组成。我们考虑了激光诱导加热导致磁化和磁各向异性动态变化而产生的 MSW,并在微磁模拟方程中加入了动态耦合效应。结果表明,在某些条件下,这种耦合会导致波包空间阻尼的减小,这与在所考虑的结构中形成的声 MSW 模式相对应。
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来源期刊
CiteScore
1.90
自引率
9.10%
发文量
130
审稿时长
3-6 weeks
期刊介绍: Journal of Experimental and Theoretical Physics is one of the most influential physics research journals. Originally based on Russia, this international journal now welcomes manuscripts from all countries in the English or Russian language. It publishes original papers on fundamental theoretical and experimental research in all fields of physics: from solids and liquids to elementary particles and astrophysics.
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