基于铁磁金属/亚铁磁绝缘体异质结构的混合自旋霍尔纳米振荡器。

Hybrid spin Hall nano-oscillators based on ferromagnetic metal/ferrimagnetic insulator heterostructures.

机构信息

Center for Quantum Phenomena, Department of Physics, New York University, New York, NY, 10003, USA.

Department of Applied Physics and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA, 94305, USA.

出版信息

Nat Commun. 2023 Mar 14;14(1):1406. doi: 10.1038/s41467-023-37028-4.

DOI:10.1038/s41467-023-37028-4

PMID:36918562

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10015054/

Abstract

Spin-Hall nano-oscillators (SHNOs) are promising spintronic devices to realize current controlled GHz frequency signals in nanoscale devices for neuromorphic computing and creating Ising systems. However, traditional SHNOs devices based on transition metals have high auto-oscillation threshold currents as well as low quality factors and output powers. Here we demonstrate a new type of hybrid SHNO based on a permalloy (Py) ferromagnetic-metal nanowire and low-damping ferrimagnetic insulator, in the form of epitaxial lithium aluminum ferrite (LAFO) thin films. The superior characteristics of such SHNOs are associated with the excitation of larger spin-precession angles and volumes. We further find that the presence of the ferrimagnetic insulator enhances the auto-oscillation amplitude of spin-wave edge modes, consistent with our micromagnetic modeling. This hybrid SHNO expands spintronic applications, including providing new means of coupling multiple SHNOs for neuromorphic computing and advancing magnonics.

摘要

自旋霍尔纳米振荡器（SHNO）是一种有前途的自旋电子器件，可在纳米级设备中实现电流控制的 GHz 频率信号，用于神经形态计算和创建伊辛系统。然而，基于过渡金属的传统 SHNO 器件具有较高的自激振荡阈值电流以及较低的品质因数和输出功率。在这里，我们展示了一种基于坡莫合金（Py）铁磁金属纳米线和低阻尼亚铁磁绝缘体的新型混合 SHNO，其形式为外延锂铝铁氧体（LAFO）薄膜。这种 SHNO 的优越特性与更大的自旋进动角度和体积的激发有关。我们进一步发现，亚铁磁绝缘体的存在增强了自旋波边缘模式的自激振荡幅度，这与我们的微磁学模型一致。这种混合 SHNO 扩展了自旋电子学的应用，包括为神经形态计算提供耦合多个 SHNO 的新手段，并推进磁振子学。