Effective anisotropy of thin nanomagnets: beyond the surface anisotropy approach

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 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.

ReVTeX, 14 pages, 6 figures

References in corpus (3)

• Fractional vortices and composite domain walls in flat nanomagnets
• Statics and Fast Dynamics of Nanomagnets with Vortex Structure
• Inhomogeneous States in a Small Magnetic Disk with Single-Ion Surface Anisotropy

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• Magnetic vortex-antivortex crystals generated by spin-polarized current
• Effects of Surface Anisotropy on Magnetic Vortex Core
• Transmutation of momentum into position in magnetic vortices
• Externally-driven transformations of vortex textures in flat submicrometer magnets
• Vortex Polarity Switching in Magnets with Surface Anisotropy