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Abstract: In the presence of spatial variation of the magnetization direction, electriccurrent noise causes a fluctuating spin-transfer torque that increases thefluctuations of the ferromagnetic order parameter. By thefluctuation-dissipation theorem, the equilibrium fluctuations are related tothe magnetization damping, which in non-uniform ferromagnets acquires anonlocal tensor structure. In biased ferromagnets, shot noise can become thedominant contribution to the magnetization noise at low temperatures.Considering spin spirals as a simple example, we show that the current-inducednoise and damping is significant.



Autor: Jorn Foros, Arne Brataas, Yaroslav Tserkovnyak, Gerrit E. W. Bauer

Fuente: https://arxiv.org/







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