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) Three-dimensional Character of the Magnetization Dynamics in Magnetic Vortex Structures: Hybridization of Flexure Gyromodes with Spin Waves. PHYSICAL REVIEW LETTERS, 117 (3): 037208. ISSN 0031-9007, 1079-7114
Full text not available from this repository. (Request a copy)Abstract
Three-dimensional linear spin-wave eigenmodes of a vortex-state Permalloy disk are studied by micromagnetic simulations based on the Landau-Lifshitz-Gilbert equation. The simulations confirm that the increase of the disk thickness leads to the appearance of additional exchange-dominated so-called gyrotropic flexure modes having nodes along the disk thickness, and eigenfrequencies that decrease when the thickness is increased. We observe the formation of a gap in the mode spectrum caused by the hybridization of the first flexure mode with one of the azimuthal spin-wave modes of the disk. A qualitative change of the transverse profile of this azimuthal mode is found, demonstrating that in a thick vortex-state disk the influence of the "transverse" and the "azimuthal" coordinates cannot be separated. The three-dimensional character of the eigenmodes is essential to explain the recently observed asymmetries in an experimentally obtained phase diagram of vortex-core reversal in relatively thick Permalloy disks.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CORE REVERSAL; STATE; EXCITATION; SCATTERING; NANODOTS; MODES; FIELD; |
| 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: | 29 Mar 2019 12:15 |
| Last Modified: | 29 Mar 2019 12:15 |
| URI: | https://pred.uni-regensburg.de/id/eprint/3631 |
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