The nonlinear dynamic behavior of a magnetic skyrmion in circular nanodots was studied numerically by solving the Landau-Lifshitz-Gilbert equation with a classical spin model. We show that a skyrmion core reversal can be achieved within nanoseconds using a perpendicular oscillating magnetic field. Two symmetric switching processes that correspond to excitations of the breathing mode and the mixed mode (combination of the breathing mode and a radial spin-wave mode) are identified. For excitation of the breathing mode, the skyrmion core switches through nucleation of a new core from a transient uniform state. In the mixed mode, the skyrmion core reverses with the help of spins excited both at the edge and core regions. Unlike the magnetic vortex core reversal, the excitation of radial spin waves does not dominate the skyrmion core reversal process.
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9 March 2015
Research Article|
March 09 2015
Microwave-induced dynamic switching of magnetic skyrmion cores in nanodots
Bin Zhang;
Bin Zhang
1Institut für Experimentalphysik,
Freie Universität Berlin
, Arnimallee 14, 14195 Berlin, Germany
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Weiwei Wang
;
Weiwei Wang
2Faculty of Engineering and the Environment,
University of Southampton
, SO17 1BJ Southampton, United Kingdom
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Marijan Beg;
Marijan Beg
2Faculty of Engineering and the Environment,
University of Southampton
, SO17 1BJ Southampton, United Kingdom
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Hans Fangohr;
Hans Fangohr
2Faculty of Engineering and the Environment,
University of Southampton
, SO17 1BJ Southampton, United Kingdom
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Wolfgang Kuch
Wolfgang Kuch
a)
1Institut für Experimentalphysik,
Freie Universität Berlin
, Arnimallee 14, 14195 Berlin, Germany
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a)
Electronic mail: kuch@physik.fu-berlin.de
Appl. Phys. Lett. 106, 102401 (2015)
Article history
Received:
December 10 2014
Accepted:
February 27 2015
Citation
Bin Zhang, Weiwei Wang, Marijan Beg, Hans Fangohr, Wolfgang Kuch; Microwave-induced dynamic switching of magnetic skyrmion cores in nanodots. Appl. Phys. Lett. 9 March 2015; 106 (10): 102401. https://doi.org/10.1063/1.4914496
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