Magnetization noise in magnetoelectronic nanostructures |
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Authors: | Foros Jørn Brataas Arne Tserkovnyak Yaroslav Bauer Gerrit E W |
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Institution: | Department of Physics, Norwegian University of Science and Technology, 7491 Trondheim, Norway. |
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Abstract: | By scattering theory we show that spin current noise in normal electric conductors in contact with nanoscale ferromagnets increases the magnetization noise by means of a fluctuating spin-transfer torque. Johnson-Nyquist noise in the spin current is related to the increased Gilbert damping due to spin pumping, in accordance with the fluctuation-dissipation theorem. Spin current shot noise in the presence of an applied bias is the dominant contribution to the magnetization noise at low temperatures. |
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