Energetics and switching of quasi-uniform states in small ferromagnetic particles.
ESAIM-MATH MODEL NUM
235 - 248.
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.
|Title:||Energetics and switching of quasi-uniform states in small ferromagnetic particles|
|Keywords:||micromagnetics, finite elements, FINITE, MAGNETIZATION, MICROMAGNETICS, NUCLEATION, ANISOTROPY, ELEMENTS, CUBE|
|UCL classification:||UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Maths and Physical Sciences
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