Research Papers in Physics and Astronomy

 

Date of this Version

5-22-2012

Document Type

Article

Citation

PHYSICAL REVIEW B 85, 174429 (2012)

DOI: 10.1103/PhysRevB.85.174429

Comments

©2012 American Physical Society. Used by permission.

Abstract

We investigate the change of magnetic vortex states driven by curvature. The equilibrium state and magnetization reversal of soft magnetic permalloy (Py, Ni 80Fe 20) caps on self-assembled spherical particles with diameters of 100, 330, and 800 nm are investigated, revealing the vortex ground state for individual caps and closely packed cap arrays. The magnetic coupling between vortices is substantially reduced due to the shape of the cap as apparent in a much weaker dependence of the magnetization reversal process on the separation distance. Interestingly, the remaining coupling is still sufficiently large to introduce chirality frustrated vortex states in closely packed cap arrays. © 2012 American Physical Society.

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