title: Driven dynamic mode splitting of the magnetic vortex translational resonance.
abstract: A magnetic vortex in a restricted geometry possesses a nondegenerate translational excitation that corresponds to circular motion of its core at a characteristic frequency. For 40-nm thick, micron-sized permalloy elements, we find that the translational-mode microwave absorption peak splits into two peaks that differ in frequency by up to 25% as the driving field is increased. An analysis of micromagnetic equations shows that for large driving fields two stable solutions emerge.
authors.affiliation: Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: K S
authors.initials: KS
authors.lastname: Buchanan
authors.forename: M
authors.initials: M
authors.lastname: Grimsditch
authors.forename: F Y
authors.initials: FY
authors.lastname: Fradin
authors.forename: S D
authors.initials: SD
authors.lastname: Bader
authors.forename: V
authors.initials: V
authors.lastname: Novosad