Effective anisotropy of thin nanomagnets: Beyond the surface-anisotropy approach
- 15 November 2007
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 76 (17), 174428
- https://doi.org/10.1103/physrevb.76.174428
Abstract
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 inhomogeneous on-site 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.Keywords
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