Long-timescale fluctuations in zero-field magnetic vortex oscillations driven by dc spin-polarized current

Abstract

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 102 to 104 oscillation cycles . First, we observe fluctuations between two center frequencies separated by 10s of MHz that we… (More)

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