科研之友
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摘要
The spin-transfer torque from a dc spin-polarized current can generate highly coherent magnetic precession in nanoscale magnetic-multilayer devices. By measuring linewidths of spectra from the resulting resistance oscillations, we argue that the coherence time can be limited at low temperature by thermal deflections about the equilibrium magnetic trajectory and at high temperature by thermally activated transitions between dynamical modes. Surprisingly, the coherence time can be longer than predicted by simple macrospin simulations.
- 出版日期2005-12
