Magnetic vortex core reversal by rotating magnetic fields generated on micrometer length scales

  • AbstractUnidirectional 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 coreAbstractUnidirectional 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.show moreshow less

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Author:Michael Curcic, Hermann Stoll, Markus Weigand, Vitalij Sackmann, Patrick Juellig, Matthias Kammerer, Matthias Noske, Markus Sproll, Bartel Van Waeyenberge, Arne Vansteenkiste, Georg Woltersdorf, Tolek Tyliszczak, Gisela Schütz
Fachbereich/Einrichtung:Hochschule Düsseldorf / Fachbereich - Elektro- & Informationstechnik
Document Type:Article
Year of Completion:2011
Language of Publication:English
Publisher:Wiley
Parent Title (English):physica status solidi (b)
Volume:248
Issue:10
Page Number:6
First Page:2317
Last Page:2322
DOI:https://doi.org/10.1002/pssb.201147208
ISSN:0370-1972
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Licence (German):keine Lizenz - nur Metadaten
Release Date:2024/11/21
Note:
Acknowledgements
Cooperation and many fruitful discussions with Manfred Fähnle are gratefully acknowledged. The use of the STXM (beamline 11.0.2) at the Advanced Light Source, Berkeley, was supported by the Director, Office of Science, Office of Basic Energy Sciences, Materials Sciences, and Engineering Division, US Department of Energy.
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