TITLE

Tailoring magnetic vortices in nanostructures

AUTHOR(S)
Garcia, F.; Westfahl, H.; Schoenmaker, J.; Carvalho, E. J.; Santos, A. D.; Pojar, M.; Seabra, A. C.; Belkhou, R.; Bendounan, A.; Novais, E. R. P.; Guimarães, A. P.
PUB. DATE
July 2010
SOURCE
Applied Physics Letters;7/12/2010, Vol. 97 Issue 2, p022501
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Tailoring the properties of magnetic vortices through the preparation of structured multilayers is discussed. The dependence of the vortex core radius r on the effective anisotropy is derived within a simple model, which agrees with our simulations. As the perpendicular anisotropy increases, r also increases until a perpendicular magnetization appears in the disk rim. Co/Pt multilayer disks were studied; x-ray microscopy confirms qualitatively the predicted behavior. This is a favorable system for implementing vortex-based spin-transfer nano-oscillator devices, with enhanced rf power resulting both from the increase in the core size and synchronization afforded by the coupling of the Co layers.
ACCESSION #
52289463

 

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