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Vortex Polarity Switching in Magnets wit...
Pylypovskyi, Oleksan...

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Vortex Polarity Switching in Magnets with Surface Anisotropy by Pylypovskyi, Oleksandr V. ( Author )
Lemonjar Open Access
N.A
26-01-2015
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 deformationof 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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Article
pdf
36.88 KB
English
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MYR 0.01
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https://arxiv.org/abs/1501.06548
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