Influence of surface anisotropy on the magnetization reversal of nanoparticles

2004/07/07 by Oscar Iglesias, Amilcar Labarta
Physics and Astronomy · #cond-mat.mtrl-sci

paper · pdf · doi:10.1002/pssc.200405485

published as Phys. Stat. Sol. C, 1, 3481 (2004) · Contribution to SCM2004 (2nd Seeheim Conference on Magnetism), to be published in Physica Status Solidi A. 4 pages, 2 figures

arxiv created 2004/07/07 · arxiv updated 2009/12/01

Abstract

The influence of surface anisotropy on the magnetization processes of maghemite nanoparticles with ellipsoidal shape is studied by means of Monte Carlo simulations. Radial surface anisotropy is found to favor the formation of hedgehog-like spin structures that become more stable as the surface anisotropy constant at the surface k_S is increased form the value at the core. We have studied the change in the low temperature hysteresis loops with the particle aspect ratio and with k_S, finding a change in the magnetization reversal mode as k_S or the particle elongation is increased.

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