title: Detection of current-induced resonance of geometrically confined domain walls.
abstract: Magnetic domain walls are found to exhibit quasiparticle behavior when subjected to geometrical variations. Because of the spin torque effect such a quasiparticle in a potential well is excited by an ac current leading to a dip in the depinning field at resonance for current densities as low as 2 x 10(10) A/m2. Independently the resonance frequencies of transverse walls and vortex walls are determined from the dc voltage that develops due to a rectifying effect of the resonant domain wall oscillation. The dependence on the injected current density reveals a strongly nonharmonic oscillation.
authors.affiliation: Universität Konstanz, Universitätsstrasse 10, D-78457, Konstanz, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Bedau
authors.forename: M
authors.initials: M
authors.lastname: Kläui
authors.forename: S
authors.initials: S
authors.lastname: Krzyk
authors.forename: U
authors.initials: U
authors.lastname: Rüdiger
authors.forename: G
authors.initials: G
authors.lastname: Faini
authors.forename: L
authors.initials: L
authors.lastname: Vila