Vortex polarity switching in magnets with surface anisotropy
DOI (Low Temperature Physics):
https://doi.org/10.1063/1.4919374%20Ключові слова:
vortex core, surface anisotropy, magnetic field, Heisenberg magnet.Анотація
Vortex core reversal in magnetic particle is essentially influenced by a surface anisotropy. Under the action of a perpendicular static magnetic field the vortex core undergoes a shape deformation of pillow- or barrel-shaped type, depending on the type of the surface anisotropy. This deformation plays a key point in the switching mechanism: We predict that the vortex polarity switching is accompanied (i) by a linear singularity in case of Heisenberg magnet with bulk anisotropy only and (ii) by a point singularities in case of surface anisotropy or exchange anisotropy. We study in details the switching process using spin-lattice simulations and propose a simple analytical description using a wired core model, which provides an adequate description of the Bloch point statics, its dynamics and the Bloch point mediated switching process. Our analytical predictions are confirmed by spin-lattice simulations for Heisenberg magnet and micromagnetic simulations for nanomagnet with account of a dipolar interaction.
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2015-03-17
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Oleksandr V. Pylypovskyi, Denis D. Sheka, Volodymyr P. Kravchuk, and Yuri Gaididei, Vortex polarity switching in magnets with surface anisotropy, Low Temp. Phys. 41, (2015) [Fiz. Nizk. Temp. 41, 466-481, (2015)] DOI: https://doi.org/10.1063/1.4919374 .
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