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Dynamic simulations of the dipolar driven demagnetization process of magnetic multi-core nanoparticles

Alexander Weddemann, Alexander Auge, D. Kappe, Frank Wittbracht and Andreas Hütten
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Alexander Weddemann: Center for Mathematical Economics, Bielefeld University
Alexander Auge: Center for Mathematical Economics, Bielefeld University
D. Kappe: Center for Mathematical Economics, Bielefeld University
Frank Wittbracht: Center for Mathematical Economics, Bielefeld University
Andreas Hütten: Center for Mathematical Economics, Bielefeld University

No 322, Center for Mathematical Economics Working Papers from Center for Mathematical Economics, Bielefeld University

Abstract: In this work, we investigate dynamically the dipolar driven demagnetization process of magnetic multicore particles by solving the Landau-Lifshitz equation for single-domain particles distributed on a three-dimensional sphere. We analyze the relaxation time in respect to different geometry and material parameters. Further we show that the demagnetization times differ from the behaviour of a single magnetic sphere in the case of low damping. To explain these dynamics nanoparticular systems of different dimensions are investigated. We show that deviations can be attributed to a confinement of the relaxation dynamics to a lower dimensional submanifold of the k-space. (C) 2009 Elsevier B. V. All rights reserved.

Keywords: relaxation; Landau-Lifshitz equation; Magnetic multi-core nanoparticles; Magnetic; Dipole-dipole coupling (search for similar items in EconPapers)
Date: 2010-04-26
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