Surface-induced cubic anisotropy in nanomagnets

Details Surface-induced cubic anisotropy in nanomagnets Surface-induced cubic anisotropy in nanomagnets

2005-10-03

arxiv.org/abs/cond-mat/0510047v3

Phys. Rev. B 73 (2006) 224402

Physics

Condensed Matter

Statistical Mechanics

7 pages, 8 figures

Scientific paper

10.1103/PhysRevB.73.224402

We investigate the effect of surface anisotropy in a spherical many-spin magnetic nanoparticle. By computing minor loops, two-dimensional (2D) and 3D energyscape, and by investigating the behavior of the net magnetization, we show that in the case of not too strong surface anisotropy the behavior of the many-spin particle may be modeled by that of a macrospin with an effective energy containing uniaxial and cubic anisotropy terms. This holds for both the transverse and N\'eel's surface anisotropy models.

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