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Communication Dans Un Congrès Année : 2016

Finite-dimensional colored fluctuation-dissipation theorem for spin systems

Résumé

When nano-magnets are coupled to random external sources, their magnetization becomes a random variable, whose properties are defined by an induced probability density, that can be reconstructed from its moments, using the Langevin equation, for mapping the noise to the dynamical degrees of freedom. When the spin dynamics is discretized in time, a general fluctuation-dissipation theorem, valid for non-Markovian noise, can be established, even when zero modes are present. We discuss the subtleties that arise, when Gilbert damping is present and the mapping between noise and spin degrees of freedom is non--linear.

Dates et versions

hal-01377522 , version 1 (07-10-2016)

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Stam Nicolis, Pascal Thibaudeau, Julien Tranchida. Finite-dimensional colored fluctuation-dissipation theorem for spin systems. 61st Annual Conference on Magnetism and Magnetic Materials, Oct 2016, New Orleans, United States. ⟨hal-01377522⟩
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