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Energetics and switching of quasi-uniform states in small ferromagnetic particles

Alouges, F; Conti, S; DeSimone, A; Pokern, Y; (2004) Energetics and switching of quasi-uniform states in small ferromagnetic particles. ESAIM-MATH MODEL NUM , 38 (2) 235 - 248. 10.1051/m2an:2004011.

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Abstract

We present a numerical algorithm to solve the micromagnetic equations based on tangential-plane minimization for the magnetization update and a homothethic-layer decomposition of outer space for the computation of the demagnetization field. As a first application, detailed results on the flower-vortex transition in the cube of Micromagnetic Standard Problem number 3 are obtained, which confirm, with a different method, those already present in the literature, and validate our method and code. We then turn to switching of small cubic or almost-cubic particles, in the single-domain limit. Our data show systematic deviations from the Stoner-Wohlfarth model due to the non-ellipsoidal shape of the particle, and in particular a non-monotone dependence on the particle size.

Type: Article
Title: Energetics and switching of quasi-uniform states in small ferromagnetic particles
DOI: 10.1051/m2an:2004011
Keywords: micromagnetics, finite elements, FINITE, MAGNETIZATION, MICROMAGNETICS, NUCLEATION, ANISOTROPY, ELEMENTS, CUBE
UCL classification: UCL > School of BEAMS > Faculty of Maths and Physical Sciences
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Statistical Science
URI: http://discovery.ucl.ac.uk/id/eprint/104089
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