物理学进展

物理学进展 ›› 2020, Vol. 40 ›› Issue (6): 189-210.doi: 10.13725/j.cnki.pip.2020.06.003

所属专题： 2022年, 第42卷

• • 上一篇    

自旋霍尔纳米振荡器的非线性动力学及其应用

  

  1. 1. 南京大学物理学院，江苏省纳米技术重点实验室，南京，210093  2. 南京邮电大学理学院，南京，210023

  • 出版日期:2020-12-20 发布日期:2020-12-18
  • 基金资助:
    国家重点研发计划（ 项目编 号：2016YFA0300803）, 国家自然科学基金（ 批准 号：11774150, 12074178, 12004171），江苏省青年基 金（批准号：BK20200309）和江苏省重点纳米技术实 验室开放基金资助

Nonlinear Dynamics and Applications of Spin Hall Nano-Oscillators

  1. 1. National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093, China 2. School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China

  • Online:2020-12-20 Published:2020-12-18

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摘要：

自旋霍尔纳米振荡器利用电流产生的自旋轨道力矩驱动磁性薄膜中磁矩进行高频进动，能在微纳尺度下实现全电学调控的相干自旋波和微波信号，是一类新型的纳米自旋电子学器件，在信息存储、处理和通信方面具有广泛的应用前景。基于强自旋轨道矩效应，人们近期在各类铁 磁/非磁重金属构成的双层薄膜结构中，已实现了多种不同自旋波模式的电学激发和调控，并对 其复杂的非线性动力学特性进行了深入的探究。基于这些前期的研究结果与最新的进展，我们在 本综述中对“对三角”结构的纳米间隙型、“蝴蝶结”型、纳米线型、垂直纳米点接触型以及阵 列等具有各类器件结构的自旋霍尔纳米振荡器所体现出来的丰富非线性动力学特性进行了详细讨 论与归纳，并对其在新型低能耗量子磁振子自旋器件和非冯诺依曼架构的自旋型人工神经网络计 算方面的潜在应用也进行了探讨。

关键词: 自旋–轨道力矩, 自旋霍尔纳米振荡器, 自旋波, 同步

Abstract:

Spin Hall nano oscillator (SHNO), a new type spintronic nano-device, can generate microwave signal and excite coherent spin waves due to spin current-driven magnetization precession and have strong potential for applications from data storage，rf communication, microwave generation to neuromorphic computing. In this review, we focus on the complex nonlinear dynamic characteristics of spin-wave modes generated by SHNOs in the various ferromagnetic/nonmagnetic (FM/NM) bilayer systems with an extended free layer. Based on the abundantly previous experimental results obtained by combining microwave spectroscopy and micro-focused Brillouin light scattering techniques, as well as micromagnetic simulation, we detailedly describe and summarize the experimental parameters dependent magnetic dynamics of SHNOs with different device configurations and magnetic materials, such as in-plane nanogap-type, nanoconstriction-type, nanowire-type, vertical nanocontact-type SHNOs with in-plane or out-of-plane magnetization. Finally, we also discuss mutual synchronization of SHNO arrays and the potential applications in magnon-based logic devices with ultralow energy consumption and spin-based artificial neural network for neuromorphic computing in the field of artificial intelligence.

Key words: spin Hall nano-oscillator, spin-orbit torque, spin-waves, mutual synchronization

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