Surface anisotropy in nanomagnets: transverse or N\'eel ?
H. Kachkachi, H. Mahboub
TL;DR
This study compares transverse and Ne9el surface anisotropy models in nanomagnets, finding Ne9el's model more consistent with experimental results and revealing different magnetization switching behaviors.
Contribution
The paper introduces a comparative analysis of surface anisotropy models in nanomagnets, highlighting the suitability of Ne9el's model over the transverse model.
Findings
Ne9el's model aligns better with experimental data.
Different switching mechanisms observed: cluster-wise vs. coherent rotations.
Ne9el's model predicts more realistic hysteresis behavior.
Abstract
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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