Vortex circulation patterns in planar microdisk arrays

Velten, S.; Streubel, R.; Farhan, A.; Kent, N.; Im, M.-Y.; Scholl, A.; Dhuey, S.; Behncke, C.; Meier, G.; Fischer, P.

doi:10.1063/1.4990990

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Vortex circulation patterns in planar microdisk arrays

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Meier, G.
Dynamics and Transport in Nanostructures, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Citation

Velten, S., Streubel, R., Farhan, A., Kent, N., Im, M.-Y., Scholl, A., et al. (2017). Vortex circulation patterns in planar microdisk arrays. Applied Physics Letters, 110: 262406. doi:10.1063/1.4990990.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-A482-B

Abstract

We report a magnetic X-ray microscopy study of the pattern formation of circulation in arrays of magnetic vortices ordered in a hexagonal and a honeycomb lattice. In the honeycomb lattice, we observe at remanence an ordered phase of alternating circulations, whereas in the hexagonal lat- tice, small regions of alternating lines form. A variation in the edge-to-edge distance shows that the size of those regions scales with the magnetostatic interaction. Micromagnetic simulations reveal that the patterns result from the formation of flux closure states during the nucleation process.