Phys. Rev. Lett. 99, 267201 (2007) [4 pages]Driven Dynamic Mode Splitting of the Magnetic Vortex Translational ResonanceReceived 10 April 2007; revised 16 August 2007; published 27 December 2007 A magnetic vortex in a restricted geometry possesses a nondegenerate translational excitation that corresponds to circular motion of its core at a characteristic frequency. For 40-nm thick, micron-sized permalloy elements, we find that the translational-mode microwave absorption peak splits into two peaks that differ in frequency by up to 25% as the driving field is increased. An analysis of micromagnetic equations shows that for large driving fields two stable solutions emerge. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.267201
DOI:
10.1103/PhysRevLett.99.267201
PACS:
75.40.Gb, 75.30.Ds, 75.75.+a
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