Interface enhanced precessional damping in spintronic multilayers: A perspective
Interface enhanced precessional damping in spintronic multilayers: A perspective
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自旋电子多层膜界面增强的进动阻尼：一个视角
DOI：
10.1063/5.0080267
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发表时间：
2022-05
影响因子：
3.2
通讯作者：
C. Swindells;D. Atkinson
中科院分区：
文献类型：
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作者：
C. Swindells;D. Atkinson
在过去的二十年里，对多层薄膜中的阻尼以及更广泛地说，在自旋电子系统中的自旋输运的理解有了巨大的发展。在多层铁磁/非磁性(FM)/非磁性(NM)薄膜系统中，铁磁共振进动的观测表明，当FM薄膜中有重金属(如铂)时，基波损耗显著增加。这些观察结果导致了重大的理论发展，并被“自旋泵浦”理论所主导，该理论描述了通过自旋电流从进动磁化到重金属中穿过界面的传播或“泵浦”来增强阻尼力。本文介绍了FM/NM系统中主要的早期实验结果，并概述了用来解释在这些系统中观察到的增强阻尼的理论模型。随后在理论模型的背景下对一系列实验结果进行了更广泛的讨论，强调了理论和实验之间的一致性，以及需要进一步从理论上考虑的最近的观察结果，特别是关于界面和邻近感应磁层在重金属层中的作用。《透视》最后概述了在自旋输运的更广泛背景下的自旋泵浦。
In the past two decades, there have been huge developments in the understanding of damping in multilayered thin films and, more generally, in spin-transport in spintronic systems. In multilayered ferromagnetic (FM)/non-magnetic (NM) thin-film systems, observations of ferromagnetic resonant precession show a strong increase in the fundamental damping when the FM thin films are layered with heavy metals, such as Pt. These observations led to significant theoretical developments, dominated by the “spin-pumping” formalism, which describes the enhancement of damping in terms of the propagation or “pumping” of spin-current across the interface from the precessing magnetization into the heavy metal. This paper presents a perspective that introduces the key early experimental damping results in FM/NM systems and outlines the theoretical models developed to explain the enhanced damping observed in these systems. This is followed by a wider discussion of a range of experimental results in the context of the theoretical models, highlighting agreement between the theory and experiment, and more recent observations that have required further theoretical consideration, in particular, with respect to the role of the interfaces and proximity-induced magnetism in the heavy metal layer. The Perspective concludes with an outline discussion of spin-pumping in the broader context of spin-transport.