title: Magnetization noise in magnetoelectronic nanostructures.
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.
authors.affiliation: Department of Physics, Norwegian University of Science and Technology, 7491 Trondheim, Norway.
authors.forename: Jørn
authors.initials: J
authors.lastname: Foros
authors.forename: Arne
authors.initials: A
authors.lastname: Brataas
authors.forename: Yaroslav
authors.initials: Y
authors.lastname: Tserkovnyak
authors.forename: Gerrit E W
authors.initials: GE
authors.lastname: Bauer