Noske, Matthias and Stoll, Hermann and Faehnle, Manfred and Gangwar, Ajay and Woltersdorf, Georg and Slavin, Andrei and Weigand, Markus and Dieterle, Georg and Foerster, Johannes and Back, Christian H. and Schuetz, Gisela (2016) Spin wave mediated unidirectional vortex core reversal by two orthogonal monopolar field pulses: The essential role of three-dimensional magnetization dynamics. JOURNAL OF APPLIED PHYSICS, 119 (17): 173901. ISSN 0021-8979, 1089-7550
Full text not available from this repository. (Request a copy)Abstract
Scanning transmission x-ray microscopy is employed to investigate experimentally the reversal of the magnetic vortex core polarity in cylindrical Ni81Fe19 nanodisks triggered by two orthogonal monopolar magnetic field pulses with peak amplitude B-0, pulse length tau = 60 ps, and delay time Delta t in the range from -400 ps to +400 ps between the two pulses. The two pulses are oriented in-plane in the x- and y-directions. We have experimentally studied vortex core reversal as a function of B-0 and Delta t. The resulting phase diagram shows large regions of unidirectional vortex core switching where the switching threshold is modulated due to resonant amplification of azimuthal spin waves. The switching behavior changes dramatically depending on whether the first pulse is applied in the x- or the y-direction. This asymmetry can be reproduced by three-dimensional micromagnetic simulations but not by two-dimensional simulations. This behavior demonstrates that in contrast to the previous experiments on vortex core reversal, the three-dimensionality in the dynamics is essential here. (C) 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | EXCITATION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Back > Group Christian Back |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 20 Mar 2019 13:03 |
| Last Modified: | 20 Mar 2019 13:03 |
| URI: | https://pred.uni-regensburg.de/id/eprint/2943 |
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