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Magnetic vortex core reversal by rotating magnetic fields generated on micrometer length scales
Author(s) -
Curcic Michael,
Stoll Hermann,
Weigand Markus,
Sackmann Vitalij,
Juellig Patrick,
Kammerer Matthias,
Noske Matthias,
Sproll Markus,
Van Waeyenberge Bartel,
Vansteenkiste Arne,
Woltersdorf Georg,
Tyliszczak Tolek,
Schütz Gisela
Publication year - 2011
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201147208
Subject(s) - vortex , magnetic field , physics , excitation , rotation (mathematics) , decoupling (probability) , core (optical fiber) , condensed matter physics , amplitude , magnetization , optics , dipole , geometry , mechanics , mathematics , quantum mechanics , control engineering , engineering
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 90° 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.