Influence of surface anisotropy on the magnetization reversal of nanoparticles

Details Influence of surface anisotropy on the magnetization reversal of nanoparticles Influence of surface anisotropy on the magnetization reversal of nanoparticles

2004-07-07

arxiv.org/abs/cond-mat/0407176v1

Phys. Stat. Sol. C, 1, 3481 (2004)

Physics

Condensed Matter

Materials Science

Contribution to SCM2004 (2nd Seeheim Conference on Magnetism), to be published in Physica Status Solidi A. 4 pages, 2 figures

Scientific paper

10.1002/pssc.200405485

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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