Spectral Characteristics of the Microwave Emission by the Spin Hall Nano-Oscillator

被引:189
作者
Liu, R. H. [1 ]
Lim, W. L. [1 ]
Urazhdin, S. [1 ]
机构
[1] Emory Univ, Dept Phys, Atlanta, GA 30322 USA
基金
美国国家科学基金会;
关键词
MAGNETIC MULTILAYERS; POLARIZED CURRENT; DRIVEN; GENERATION;
D O I
10.1103/PhysRevLett.110.147601
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We utilized microwave spectroscopy to study the magnetization oscillations locally induced in a Permalloy film by a pure spin current, which is generated due to the spin Hall effect in an adjacent Pt layer. The oscillation frequency is lower than the ferromagnetic resonance of Permalloy, indicating that the oscillation forms a self-localized nonpropagating spin-wave soliton. At cryogenic temperatures, the spectral characteristics are remarkably similar to the traditional spin-torque nano-oscillators driven by spin-polarized currents. However, the linewidth of the oscillation increases exponentially with temperature and an additional peak appears in the spectrum below the ferromagnetic resonance, suggesting that the spectral characteristics are determined by interplay between two localized dynamical states. DOI: 10.1103/PhysRevLett.110.147601
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页数:5
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