Consistent energy barrier distributions in magnetic particle chains

O. Laslett, S. Ruta, R. W. Chantrell, J. Barker, G. Friedman, O. Hovorka

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We investigate long-time thermal activation behaviour in magnetic particle chains of variable length. Chains are modelled as Stoner-Wohlfarth particles coupled by dipolar interactions. Thermal activation is described as a hopping process over a multidimensional energy landscape using the discrete orientation model limit of the Landau-Lifshitz-Gilbert dynamics. The underlying master equation is solved by diagonalising the associated transition matrix, which allows the evaluation of distributions of time scales of intrinsic thermal activation modes and their energy representation. It is shown that as a result of the interaction dependence of these distributions, increasing the particle chain length can lead to acceleration or deceleration of the overall relaxation process depending on the initialisation procedure.

Original languageEnglish
Pages (from-to)173-176
Number of pages4
JournalPhysica B: Condensed Matter
Volume486
DOIs
Publication statusPublished - 2016 Apr 1

Keywords

  • Dipolar interaction
  • Energy barrier distributions
  • Magnetic particle chains
  • Thermal relaxation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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