title: Time-resolved imaging of pulse-induced magnetization reversal with a microwave assist field.
abstract: The reversal of the magnetization under the influence of a field pulse has been previously predicted to be an incoherent process with several competing phenomena such as domain wall relaxation, spin wave-mediated instability regions, and vortex-core mediated reversal dynamics. However, there has been no study on the direct observation of the switching process with the aid of a microwave signal input. We report a time-resolved imaging study of magnetization reversal in patterned magnetic structures under the influence of a field pulse with microwave assistance. The microwave frequency is varied to demonstrate the effect of resonant microwave-assisted switching. We observe that the switching process is dominated by spin wave dynamics generated as a result of magnetic instabilities in the structures, and identify the frequencies that are most dominant in magnetization reversal.
authors.affiliation: Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore.
authors.forename: Siddharth
authors.initials: S
authors.lastname: Rao
authors.affiliation: Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore.
authors.forename: Jan
authors.initials: J
authors.lastname: Rhensius
authors.affiliation: 1] Institute of Physics, University of Mainz, Staudinger Weg 7, 55128 Mainz, Germany [2] Max-Planck-Insitut fur Intelligente Systeme, Heisenbergstr. 3, 70569 Stuttgart, Germany.
authors.forename: Andre
authors.initials: A
authors.lastname: Bisig
authors.affiliation: 1] Institute of Physics, University of Mainz, Staudinger Weg 7, 55128 Mainz, Germany [2] Max-Planck-Insitut fur Intelligente Systeme, Heisenbergstr. 3, 70569 Stuttgart, Germany.
authors.forename: Mohamad-Assaad
authors.initials: MA
authors.lastname: Mawass
authors.affiliation: Max-Planck-Insitut fur Intelligente Systeme, Heisenbergstr. 3, 70569 Stuttgart, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Weigand
authors.affiliation: Institute of Physics, University of Mainz, Staudinger Weg 7, 55128 Mainz, Germany.
authors.forename: Mathias
authors.initials: M
authors.lastname: Kläui
authors.affiliation: Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore.
authors.forename: Charanjit S
authors.initials: CS
authors.lastname: Bhatia
authors.affiliation: Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore.
authors.forename: Hyunsoo
authors.initials: H
authors.lastname: Yang