title: Magnetic vortex cores as tunable spin-wave emitters.
abstract: The use of spin waves as information carriers in spintronic devices can substantially reduce energy losses by eliminating the ohmic heating associated with electron transport. Yet, the excitation of short-wavelength spin waves in nanoscale magnetic systems remains a significant challenge. Here, we propose a method for their coherent generation in a heterostructure composed of antiferromagnetically coupled magnetic layers. The driven dynamics of naturally formed nanosized stacked pairs of magnetic vortex cores is used to achieve this aim. The resulting spin-wave propagation is directly imaged by time-resolved scanning transmission X-ray microscopy. We show that the dipole-exchange spin waves excited in this system have a linear, non-reciprocal dispersion and that their wavelength can be tuned by changing the driving frequency.
authors.affiliation: Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany.|Technische Universität Dresden, 01069 Dresden, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Wintz
authors.affiliation: Oakland University, Rochester, Michigan 48309, USA.
authors.forename: Vasil
authors.initials: V
authors.lastname: Tiberkevich
authors.affiliation: Max-Planck-Institut für Intelligente Systeme, 70569 Stuttgart, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Weigand
authors.affiliation: Paul Scherrer Institut, 5232 Villigen, Switzerland.
authors.forename: Jörg
authors.initials: J
authors.lastname: Raabe
authors.affiliation: Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany.
authors.forename: Jürgen
authors.identifier: 0000-0002-2071-6896
authors.initials: J
authors.lastname: Lindner
authors.affiliation: Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany.
authors.forename: Artur
authors.initials: A
authors.lastname: Erbe
authors.affiliation: Oakland University, Rochester, Michigan 48309, USA.
authors.forename: Andrei
authors.initials: A
authors.lastname: Slavin
authors.affiliation: Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany.|Technische Universität Dresden, 01069 Dresden, Germany.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Fassbender