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Spin wave mediated unidirectional vortex core reversal by two orthogonal monopolar field pulses: The essential role of three-dimensional magnetization dynamics

Noske, Matthias ; Stoll, Hermann ; Fähnle, Manfred ; Gangwar, Ajay ; Woltersdorf, Georg ; Slavin, Andrei ; Weigand, Markus ; Dieterle, Georg ; Förster, Johannes ; Back, Christian H. ; Schütz, Gisela


Scanning transmission x-ray microscopy is employed to investigate experimentally the reversal of the magnetic vortex core polarity in cylindrical Ni81Fe19 nanodisks triggered by two orthogonal monopolar magnetic field pulses with peak amplitude B-0, pulse length tau = 60 ps, and delay time Delta t in the range from -400 ps to +400 ps between the two pulses. The two pulses are oriented in-plane in ...


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