Disorder effects on the metastability of classical Heisenberg ferromagnets

Moumita Naskar, Muktish Acharyya, Erol Vatansever, Nikolaos Fytas

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Abstract

In the present paper, we investigate the effects of disorder on the reversal time (τ) of classical anisotropic Heisenberg ferromagnets in three dimensions by means of Monte Carlo simulations. Starting from the pure system, our analysis suggests that τ increases with increasing anisotropy strength. On the other hand, for the case of randomly distributed anisotropy, generated from various statistical distributions, a set of results is obtained: (i) For both bimodal and uniform distributions, the variation of τ with the strength of anisotropy strongly depends on temperature. (ii) At lower temperatures, the decrement in τ with increasing width of the distribution is more prominent. (iii) For the case of normally distributed anisotropy, the variation of τ with the width of the distribution is nonmonotonic, featuring a minimum value that decays exponentially with the temperature. Finally, we elaborate on the joint effect of longitudinal (h_{z}) and transverse (h_{x}) fields on τ, which appear to obey a scaling behavior of the form τh_{z}^{n}∼f(h_{x}).
Original languageEnglish
Article number014121
Pages (from-to)(In-Press)
Number of pages18
JournalPhysical Review E
Volume108
Issue number1
DOIs
Publication statusPublished - 20 Jul 2023

Funder

M. Naskar acknowledges SVMCM scholarship for financial support. M. Acharyya acknowledges the FRPDF grant of Presidency University. Some of the numerical calculations reported in this paper were performed at TÜBİTAK ULAKBIM (Turkish agency), High Performance and Grid Computing Center (TRUBA Resources).

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