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

Thomas Nussle (), Pascal Thibaudeau and Stam Nicolis
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Thomas Nussle: CEA DAM/Le Ripault
Pascal Thibaudeau: CEA DAM/Le Ripault
Stam Nicolis: Institut Denis Poisson, UMR CNRS 7013, Université de Tours, Université d’Orléans, Parc de Grandmont

The European Physical Journal B: Condensed Matter and Complex Systems, 2019, vol. 92, issue 2, 1-10

Abstract: 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. Graphical abstract

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1140/epjb/e2019-90539-6

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