在 Pt 上生长的超薄 YIG 中的自旋霍尔诱导自激振荡

Spin Hall-induced auto-oscillations in ultrathin YIG grown on Pt.

机构信息

Institute for Applied Physics and Center for Nanotechnology, University of Muenster, Corrensstrasse 2-4, 48149, Muenster, Germany.

Department of Physics and Astronomy, University of California, Irvine, CA, 92697, USA.

出版信息

Sci Rep. 2018 Jan 19;8(1):1269. doi: 10.1038/s41598-018-19606-5.

DOI:10.1038/s41598-018-19606-5

PMID:29352149

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5775304/

Abstract

We experimentally study nanowire-shaped spin-Hall nano-oscillators based on nanometer-thick epitaxial films of Yttrium Iron Garnet grown on top of a layer of Pt. We show that, although these films are characterized by significantly larger magnetic damping in comparison with the films grown directly on Gadolinium Gallium Garnet, they allow one to achieve spin current-driven auto-oscillations at comparable current densities, which can be an indication of the better transparency of the interface to the spin current. These observations suggest a route for improvement of the flexibility of insulator-based spintronic devices and their compatibility with semiconductor technology.

摘要

我们通过实验研究了基于钇铁石榴石外延薄膜的纳米线形状的自旋霍尔纳米振荡器，该薄膜生长在铂层之上。我们表明，尽管这些薄膜的磁阻尼比直接生长在钆镓石榴石上的薄膜大得多，但它们允许在可比的电流密度下实现自旋电流驱动的自激振荡，这可以表明界面对自旋电流的透明性更好。这些观察结果为提高基于绝缘体的自旋电子器件的灵活性及其与半导体技术的兼容性提供了一种途径。