Vortex circulation patterns in planar microdisk arrays

Authors

Sven Velten, Lawrence Berkeley National LaboratoryFollow
Robert Streubel, Lawrence Berkeley National LaboratoryFollow
Alan Farhan, Lawrence Berkeley National Laboratory
Noah Kent, Lawrence Berkeley National Laboratory
Mi Young Im, Lawrence Berkeley National Laboratory
Andreas Scholl, Lawrence Berkeley National Laboratory
Scott Dhuey, Lawrence Berkeley National Laboratory
Carolin Behncke, Universität Hamburg
Guido Meier, Max Planck Institute for the Structure and Dynamics of Matter
Peter Fischer, Lawrence Berkeley National LaboratoryFollow

Date of this Version

6-26-2017

Document Type

Article

Citation

APPLIED PHYSICS LETTERS 110, 262406 (2017)

http://dx.doi.org/10.1063/1.4990990

Comments

Published by AIP Publishing. Used b y permission.

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 lattice, 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.