Tailoring magnetic vortices in nanostructures

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.
July 2010
Applied Physics Letters;7/12/2010, Vol. 97 Issue 2, p022501
Academic Journal
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.


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