Vortex circulation and polarity patterns in closely packed cap arrays

We studied curvature-driven modifications to the magnetostatic coupling of vortex circulation and polarity in soft-magnetic closely packed cap arrays. A phase diagram for the magnetic remanent/transition states at room temperature as a function of diameter and thickness was assembled. For specimens...

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Bibliographic Details
Published in:Applied physics letters 2016-01, Vol.108 (4)
Main Authors: Streubel, Robert, Kronast, Florian, Reiche, Christopher F., Mühl, Thomas, Wolter, Anja U. B., Schmidt, Oliver G., Makarov, Denys
Format: Article
Language:English
Subjects:
Air flow
Applied physics
Arrays
Circulation
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Coupling
crystal structure
Curvature
Ferrous alloys
Magnetic alloys
magnetic fields
magnetic films
Nanoparticles
NANOSCIENCE AND NANOTECHNOLOGY
nanostructures
nucleation
permalloys
Phase diagrams
Polarity
rotating flows
thin film nucleation
Vortices
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Summary:We studied curvature-driven modifications to the magnetostatic coupling of vortex circulation and polarity in soft-magnetic closely packed cap arrays. A phase diagram for the magnetic remanent/transition states at room temperature as a function of diameter and thickness was assembled. For specimens with vortex remanent state (40 nm-thick Permalloy on 330 nm spherical nanoparticles), both vortex circulation and polarity were visualized. Intercap coupling upon vortex nucleation leads to the formation of vortex circulation patterns in closely packed arrays. The remanent circulation pattern can be tailored choosing the direction of the applied magnetic field with respect to the symmetry axis of the hexagonal array. An even and random distribution of vortex polarity indicates the absence of any circulation-polarity coupling.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4941045