Recent progress on excitation and manipulation of spin-waves in spin Hall nano-oscillators

doi:10.1088/1674-1056/abaed5

中国物理B ›› 2020, Vol. 29 ›› Issue (11): 117102-.doi: 10.1088/1674-1056/abaed5

Liyuan Li(李丽媛)¹, Lina Chen(陈丽娜)¹^,²^,†(), Ronghua Liu(刘荣华)¹^,^‡(), Youwei Du(都有为)¹

收稿日期:2020-07-03 修回日期:2020-08-07 接受日期:2020-08-13 出版日期:2020-11-05 发布日期:2020-11-03

Recent progress on excitation and manipulation of spin-waves in spin Hall nano-oscillators

Liyuan Li(李丽媛)¹, Lina Chen(陈丽娜)^{1,2, †}, Ronghua Liu(刘荣华)^{1,, ‡}, and Youwei Du(都有为)¹

1 National Laboratory of Solid State Microstructures, School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
2 New Energy Technology Engineering Laboratory of Jiangsu Provence & School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China

Received:2020-07-03 Revised:2020-08-07 Accepted:2020-08-13 Online:2020-11-05 Published:2020-11-03
Contact: ^†Corresponding author. E-mail: linachen@nju.edu.cn ^‡Corresponding author. E-mail: rhliu@nju.edu.cn
Supported by:
the National Key Research and Development Program of China (Grant No. 2016YFA0300803), the National Natural Science Foundation of China (Grant Nos. 11774150, 12074178, and 12004171), the Applied Basic Research Programs of Science and Technology Commission Foundation of Jiangsu Province, China (Grant No. BK20170627), and the Open Research Fund of Jiangsu Provincial Key Laboratory for Nanotechnology.

摘要/Abstract

Abstract:

Spin Hall nano oscillator (SHNO), a new type spintronic nano-device, can electrically excite and control spin waves in both nanoscale magnetic metals and insulators with low damping by the spin current due to spin Hall effect and interfacial Rashba effect. Several spin-wave modes have been excited successfully and investigated substantially in SHNOs based on dozens of different ferromagnetic/nonmagnetic (FM/NM) bilayer systems (e.g., FM = Py, [Co/Ni], Fe, CoFeB, Y₃Fe₅O₁₂; NM = Pt, Ta, W). Here, we will review recent progress about spin-wave excitation and experimental parameters dependent dynamics in SHNOs. The nanogap SHNOs with in-plane magnetization exhibit a nonlinear self-localized bullet soliton localized at the center of the gap between the electrodes and a secondary high-frequency mode which coexists with the primary bullet mode at higher currents. While in the nanogap SHNOs with out of plane magnetization, besides both nonlinear bullet soliton and propagating spin-wave mode are achieved and controlled by varying the external magnetic field and current, the magnetic bubble skyrmion mode also can be excited at a low in-plane magnetic field. These spin-wave modes show thermal-induced mode hopping behavior at high temperature due to the coupling between the modes mediated by thermal magnon mediated scattering. Moreover, thanks to the perpendicular magnetic anisotropy induced effective field, the single coherent mode also can be achieved without applying an external magnetic field. The strong nonlinear effect of spin waves makes SHNOs easy to achieve synchronization with external microwave signals or mutual synchronization between multiple oscillators which improve the coherence and power of oscillation modes significantly. Spin waves in SHNOs with an external free magnetic layer have a wide range of applications from as a nanoscale signal source of low power consumption magnonic devices to spin-based neuromorphic computing systems in the field of artificial intelligence.

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

Liyuan Li(李丽媛), Lina Chen(陈丽娜), Ronghua Liu(刘荣华), Youwei Du(都有为). [J]. 中国物理B, 2020, 29(11): 117102-.

Liyuan Li(李丽媛), Lina Chen(陈丽娜), Ronghua Liu(刘荣华), and Youwei Du(都有为). Recent progress on excitation and manipulation of spin-waves in spin Hall nano-oscillators[J]. Chin. Phys. B, 2020, 29(11): 117102-.

图/表 9

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Recent progress on excitation and manipulation of spin-waves in spin Hall nano-oscillators

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