  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.
