Journal
PHYSICAL REVIEW B
Volume 77, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.77.054401
Keywords
-
Ask authors/readers for more resources
Starting from a model that consists of a semiclassical spin coupled to two leads, we present a microscopic derivation of the Langevin equation for the direction of the spin. For slowly changing direction, it takes on the form of the stochastic Landau-Lifschitz-Gilbert equation. We give expressions for the Gilbert damping parameter and the strength of the fluctuations, including their bias-voltage dependence. At nonzero bias voltage, the fluctuations and damping are not related by the fluctuation-dissipation theorem. We find, however, that in the low-frequency limit, it is possible to introduce a voltage-dependent effective temperature that characterizes the fluctuations in the direction of the spin, and its transport-steady-state probability distribution function.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available