Journal
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
Volume 248, Issue 10, Pages 2317-2322Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssb.201147208
Keywords
rotating magnetic fields; vortex core reversal; vortex dynamics
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Funding
- Office of Science, Office of Basic Energy Sciences, Materials Sciences, and Engineering Division, US Department of Energy
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Unidirectional switching of the magnetic vortex core can be achieved in micron-sized ferromagnetic platelets by excitation of the gyrotropic mode of the vortex structure with in-plane rotating magnetic fields. Circulating fields with a switchable sense of rotation (clockwise, CW or counter clockwise, CCW) have been generated on a micrometer length scale at frequencies up to 1 GHz by two orthogonal electric RF currents with 908 phase shift flowing through crossed but not isolated striplines. Decoupling of these currents is realized by balanced symmetric RF sources. The amplitudes of the rotating magnetic fields and their spatial distributions are calculated and the stripline geometry is discussed. By taking advantage of this technique, unidirectional vortex core reversal by excitation with CW or CCW rotating magnetic fields has been observed by time resolved scanning transmission X-ray microscopy. An area with reversed magnetization, the dip, was observed near the vortex core before vortex core reversal. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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