Effective anisotropy of thin nanomagnets: beyond the surface anisotropy approach

Details Effective anisotropy of thin nanomagnets: beyond the surface anisotropy approach Effective anisotropy of thin nanomagnets: beyond the surface anisotropy approach

2007-05-10

arxiv.org/abs/0705.1555v2

Phys. Rev. B 76, 174428 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

ReVTeX, 14 pages, 6 figures

Scientific paper

10.1103/PhysRevB.76.174428

We study the effective anisotropy induced in thin nanomagnets by the nonlocal demagnetization field (dipole-dipole interaction). Assuming a magnetization independent of the thickness coordinate, we reduce the energy to an inhomogeneneous onsite anisotropy. Vortex solutions exist and are ground states for this model. We illustrate our approach for a disk and a square geometry. In particular, we obtain good agreement between spin-lattice simulations with this effective anisotropy and micromagnetic simulations.

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