Effective temperature and Gilbert damping of a current-driven localized spin

Núñez Vásquez, Álvaro et al · AMER PHYSICAL SOC · 2010

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Núñez Vásquez, Álvaro et al

Publisher

AMER PHYSICAL SOC

Year

2010

ISSN

1098-0121

ISSN

1098-0121

Language

English

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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. This work was supported in part by the National Science Foundation under grants DMR-0606489, DMR-0210383, and PHY99-07949. ASN is partially funded by Proyecto Fondecyt de Iniciacion 11070008 and Proyecto Bicentenario de Ciencia y Tecnolog ´ıa, ACT027.

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APA 7

Núñez Vásquez, Á. E. A. (2010). Effective temperature and Gilbert damping of a current-driven localized spin. https://repositorio.uchile.cl/handle/2250/125051

MLA

Núñez Vásquez, Álvaro et al. "Effective temperature and Gilbert damping of a current-driven localized spin." 2010. https://repositorio.uchile.cl/handle/2250/125051.

Chicago

Núñez Vásquez, Álvaro et al. 2010. "Effective temperature and Gilbert damping of a current-driven localized spin.". https://repositorio.uchile.cl/handle/2250/125051.

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Núñez Vásquez, Á. E. A. 2010, Effective temperature and Gilbert damping of a current-driven localized spin, AMER PHYSICAL SOC, available at: https://repositorio.uchile.cl/handle/2250/125051 [Accessed 8 Aug. 2026].

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Title: Effective temperature and Gilbert damping of a current-driven localized spin

Author / contributors: Núñez Vásquez, Álvaro et al

Publisher: AMER PHYSICAL SOC

Publication year: 2010

ISSN: 1098-0121

ISSN: 1098-0121

Language: English

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