Effective temperature and Gilbert damping of a current-driven localized spin
| dc.creator | Nunez, A. S. | |
| dc.creator | Duine, R. A. | |
| dc.date | 2007-05-10 | |
| dc.date | 2008-02-04 | |
| dc.date.accessioned | 2026-07-07T09:18:05Z | |
| dc.date.available | 2026-07-07T09:18:05Z | |
| dc.description | 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. | |
| dc.description | 8 pages, 2 figures. v2: published version | |
| dc.identifier | https://arxiv.org/abs/0705.1432 | |
| dc.identifier | http://arxiv.org/abs/0705.1432 | |
| dc.identifier | Phys. Rev. B 77, 054401 (2008) | |
| dc.identifier | doi:10.1103/PhysRevB.77.054401 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/153903 | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.title | Effective temperature and Gilbert damping of a current-driven localized spin | |
| dc.type | text |