Phys. Rev. B 76, 174428 (2007) [13 pages]Effective anisotropy of thin nanomagnets: Beyond the surface-anisotropy approachReceived 28 May 2007; published 15 November 2007 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.76.174428
DOI:
10.1103/PhysRevB.76.174428
PACS:
75.10.Hk, 75.70.Ak, 75.40.Mg, 05.45.−a
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