Noise and dissipation in magnetoelectronic nanostructures
Jorn Foros, Arne Brataas, Gerrit E. W. Bauer, Yaroslav Tserkovnyak
TL;DR
This paper investigates how spin current fluctuations influence magnetization noise and damping in magnetic nanostructures, revealing measurable effects on resistance noise in spin valves.
Contribution
It introduces a theoretical framework linking spin current fluctuations to magnetization noise and damping, emphasizing their dependence on magnetic configuration.
Findings
Spin current fluctuations significantly contribute to magnetization noise.
Enhanced fluctuations in spin valves can be detected via resistance noise.
Magnetoelectronic circuit theory effectively models noise interactions.
Abstract
We study the coupled current and magnetization noise in magnetic nanostructures by magnetoelectronic circuit theory. Spin current fluctuations, which depend on the magnetic configuration, are found to be an important source of magnetization noise and damping in thinly layered systems. The enhanced magnetization fluctuations in spin valves can be directly measured by their effect on the resistance noise.
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