Magnetization reversals in a disk-shaped small magnet with an interface

Details Magnetization reversals in a disk-shaped small magnet with an interface Magnetization reversals in a disk-shaped small magnet with an interface

2009-09-24

arxiv.org/abs/0909.4519v1

JOURNAL OF APPLIED PHYSICS 105, 014314 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 10 figures

Scientific paper

10.1063/1.3057018

We consider a nanodisk possessing two coupled materials with different ferromagnetic exchange constant. The common border line of the two media passes at the disk center dividing the system exactly in two similar half-disks. The vortex core motion crossing the interface is investigated with a simple description based on a two-dimensional model which mimics a very thin real material with such a line defect. The main result of this study is that, depending on the magnetic coupling which connects the media, the vortex core can be dramatically and repeatedly flipped from up to down and vice versa by the interface. This phenomenon produces burst-like emission of spin waves each time the switching process takes place.

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