title: Magnetic vortex core reversal by excitation of spin waves.
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.
authors.affiliation: Max-Planck-Institut für Metallforschung, Heisenbergstraße 3, 70569 Stuttgart, Germany. kammerer@mf.mpg.de
authors.forename: Matthias
authors.initials: M
authors.lastname: Kammerer
authors.forename: Markus
authors.initials: M
authors.lastname: Weigand
authors.forename: Michael
authors.initials: M
authors.lastname: Curcic
authors.forename: Matthias
authors.initials: M
authors.lastname: Noske
authors.forename: Markus
authors.initials: M
authors.lastname: Sproll
authors.forename: Arne
authors.initials: A
authors.lastname: Vansteenkiste
authors.forename: Bartel
authors.initials: B
authors.lastname: Van Waeyenberge
authors.forename: Hermann
authors.initials: H
authors.lastname: Stoll
authors.forename: Georg
authors.initials: G
authors.lastname: Woltersdorf
authors.forename: Christian H
authors.initials: CH
authors.lastname: Back
authors.forename: Gisela
authors.initials: G
authors.lastname: Schuetz
mesh_terms: D003198:Computer Simulation; D004574:Electromagnetic Fields; D005290:Ferric Compounds; D008962:Models, Theoretical; D036103:Nanotechnology / Q000379:methods*; D017711:Nonlinear Dynamics
chemical_list: D005290:Ferric Compounds; C001215:ferrite