Surface anisotropy in nanomagnets: transverse or Néel ?

Details Surface anisotropy in nanomagnets: transverse or Néel ? Surface anisotropy in nanomagnets: transverse or Néel ?

2003-07-17

arxiv.org/abs/cond-mat/0307436v2

J. Mag. Mag. Mat. 278 (2004) 334-341

Physics

Condensed Matter

Materials Science

12 pages, 6 eps figures

Scientific paper

10.1016/j.jmmm.2003.12.1354

Through the hysteresis loop and magnetization spatial distribution we study and compare two models for surface anisotropy in nanomagnets: a model with transverse anisotropy axes and N\'eel's model. While surface anisotropy in the transverse model induces several jumps in the hysteresis loop because of the cluster-wise switching of spins, in the N\'eel model the jumps correspond to successive {\it coherent partial rotations} of the whole bunch of spins. These calculations together with experimental results suggest that N\'eel's model for surface anisotropy is more appropriate.

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