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Foros, J. (author), Brataas, A. (author), Tserkovnyak, Y. (author), Bauer, G.E.W. (author)
In the presence of spatial variation in the magnetization direction, electric current noise causes a fluctuating spin-transfer torque that increases the fluctuations of the ferromagnetic order parameter. By the fluctuationdissipation theorem, the fluctuations at thermal equilibrium are related to the viscous magnetization damping, which in...
journal article 2008
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Xiao, J. (author), Bauer, G.E.W. (author), Brataas, A. (author)
We study the bias-dependent spin-transfer torque in magnetic tunnel junctions in the Stoner model by scattering theory. We show that the in-plane (Slonczewski type) torque vanishes and subsequently reverses its direction when the bias voltage becomes larger or the barrier wider than material and device-dependent critical values. We are able to...
journal article 2008