Inhomogeneous States in a Small Magnetic Disk with Single-Ion Surface Anisotropy

Abstract

We investigate analytically and numerically the ground and metastable states for easy-plane Heisenberg magnets with single-ion surface anisotropy and disk geometry. The configurations with two half-vortices at the opposite points of the border are shown to be preferable for strong anisotropy. We propose a simple analytical description of the spin configurations for all values of a surface anisotropy. The effects of lattice pinning leads to appearance of a set of metastable configurations.

10 pages, 7 figures; submitted to Phys. Rev. B

References in corpus (3)

• Surface contribution to the anisotropy of magnetic nanoparticles
• Magnon modes and magnon-vortex scattering in two-dimensional easy-plane ferromagnets
• Magnon modes for thin circular vortex state magnetic dot

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• Vortex ground state for small arrays of magnetic particles with dipole coupling
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