Probing magneto-elastic phenomena through an effective spin-bath coupling model

Abstract : A phenomenological model is constructed, that captures the effects of coupling magnetic and elastic degrees of freedom, in the presence of external, stochastic perturbations, in terms of the interaction of magnetic moments with a bath, whose individual degrees of freedom cannot be resolved and only their mesoscopic properties are relevant. In the present work, the consequences of identifying the effects of dissipation as resulting from interactions with a bath of spins are explored, in addition to elastic, degrees of freedom. The corresponding stochastic differential equations are solved numerically and the moments of the magnetization are computed. The stochastic equations implicitly define a measure on the space of spin configurations, whose moments at equal times satisfy a hierarchy of deterministic, ordinary differential equations. Closure assumptions are used to truncate the hierarchy and the same moments are computed. We focus on the advantages and problems that each approach presents, for the approach to equilibrium and, in particular, the emergence of longitudinal damping.
Liste complète des métadonnées

https://hal.archives-ouvertes.fr/hal-01880502
Contributor : Stam Nicolis <>
Submitted on : Tuesday, April 9, 2019 - 3:55:55 PM
Last modification on : Thursday, April 11, 2019 - 2:17:43 PM

File

BAt.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : hal-01880502, version 1
  • ARXIV : 1809.05942

Collections

Citation

Thomas Nussle, Pascal Thibaudeau, Stam Nicolis. Probing magneto-elastic phenomena through an effective spin-bath coupling model. 2019. ⟨hal-01880502⟩

Share

Metrics

Record views

42

Files downloads

22