Waeyenberge, B. Van and Puzic, A. and Stoll, H. and Chou, K. and Tylisczak, T. and Hertel, R. and Fähnle, M. and Brückl, H. and Rott, K. and Reiss, G. and Neudecker, Ingo and Weiss, Dieter and Back, Christian and Schütz, G. (2006) Magnetic vortex core reversal by excitation with short bursts of an alternating field. Nature Physics 444 (7118), pp. 461-464.
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The vortex state, characterized by a curling magnetization, is one of the equilibrium configurations of soft magnetic materials1, 2, 3, 4 and occurs in thin ferromagnetic square and disk-shaped elements of micrometre size and below. The interplay between the magnetostatic and the exchange energy favours an in-plane, closed flux domain structure. This curling magnetization turns out of the plane at the centre of the vortex structure, in an area with a radius of about 10 nanometres—the vortex core5, 6, 7. The vortex state has a specific excitation mode: the in-plane gyration of the vortex structure about its equilibrium position8, 9, 10. The sense of gyration is determined by the vortex core polarization11. Here we report on the controlled manipulation of the vortex core polarization by excitation with small bursts of an alternating magnetic field. The vortex motion was imaged by time-resolved scanning transmission X-ray microscopy12. We demonstrate that the sense of gyration of the vortex structure can be reversed by applying short bursts of the sinusoidal excitation field with amplitude of about 1.5 mT. This reversal unambiguously indicates a switching of the out-of-plane core polarization. The observed switching mechanism, which can be understood in the framework of micromagnetic theory, gives insights into basic magnetization dynamics and their possible application in data storage.
|Institutions:|| Physics > Institute of Experimental and Applied Physics > Chair Professor Back > Group Christian Back|
Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss
|Projects:||SFB 689: Spinphänomene in reduzierten Dimensionen|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||20 Mar 2007|
|Last Modified:||20 Jul 2011 21:04|