Magnetic vortex core reversal by excitation of spin waves

Matthias Kammerer, Markus Weigand, Michael Curcic, Matthias Noske, Markus Sproll, Arne Vansteenkiste, Bartel Van Waeyenberge, Hermann Stoll, Georg Woltersdorf, Christian H. Back, Gisela Schuetz

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

201 Zitate (Scopus)

Abstract

Micron-sized magnetic platelets in the flux-closed vortex state are characterized by an in-plane curling magnetization and a nanometer-sized perpendicularly magnetized vortex core. Having the simplest non-trivial configuration, these objects are of general interest to micromagnetics and may offer new routes for spintronics applications. Essential progress in the understanding of nonlinear vortex dynamics was achieved when low-field core toggling by excitation of the gyrotropic eigenmode at sub-GHz frequencies was established. At frequencies more than an order of magnitude higher vortex state structures possess spin wave eigenmodes arising from the magneto-static interaction. Here we demonstrate experimentally that the unidirectional vortex core reversal process also occurs when such azimuthal modes are excited. These results are confirmed by micromagnetic simulations, which clearly show the selection rules for this novel reversal mechanism. Our analysis reveals that for spin-wave excitation the concept of a critical velocity as the switching condition has to be modified.

OriginalspracheEnglisch
Aufsatznummer279
FachzeitschriftNature Communications
Jahrgang2
Ausgabenummer1
DOIs
PublikationsstatusVeröffentlicht - 2011
Extern publiziertJa

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