期刊
PHYSICAL REVIEW B
卷 80, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.180411
关键词
fine structure; magnetic domains; magnetic switching; spin fluctuations; spin polarised transport
We report time and frequency domain studies of spin-torque-driven vortex self-oscillations at zero magnetic field. We observe two types of abrupt fluctuations in the frequency and amplitude, with very long random mean lifetimes (similar to 10(2) to similar to 10(4) oscillation cycles). First, we observe fluctuations between two center frequencies separated by 10s of MHz that we identify with switching between quasiuniform and vortex states of the magnetic polarizing layer. Second, we resolve much smaller, discrete frequency fluctuations that lead to a fine structure of the oscillations. We find that this fine structure plays a key role in determining the long-time average linewidths and we suggest a possible physical origin.
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