Groß, Felix and Zelent, Mateusz and Gangwar, Ajay and Mamica, Slawomir and Gruszecki, Pawel and Werner, Matthias and Schuetz, Gisela and Weigand, Markus and Goering, Eberhard J. and Back, Christian H. and Krawczyk, Maciej and Graefe, Joachim (2021) Phase resolved observation of spin wave modes in antidot lattices. APPLIED PHYSICS LETTERS, 118 (23): 232403. ISSN 0003-6951, 1077-3118
Full text not available from this repository. (Request a copy)Abstract
Antidot lattices have proven to be a powerful tool for spin wave band structure manipulation. Utilizing time-resolved scanning transmission x-ray microscopy, we are able to experimentally image edge-localized spin wave modes in an antidot lattice with a lateral confinement down to < 80 nm x 130 nm. At higher frequencies, spin wave dragonfly patterns formed by the demagnetizing structures of the antidot lattice are excited. Evaluating their relative phase with respect to the propagating mode within the antidot channel reveals that the dragonfly modes are not directly excited by the antenna but need the propagating mode as an energy mediator. Furthermore, micromagnetic simulations reveal that additional dispersion branches exist for a tilted external field geometry. These branches correspond to asymmetric spin wave modes that cannot be excited in a non-tilted field geometry due to the symmetry restriction. In addition to the band having a negative slope, these asymmetric modes also cause an unexpected transformation of the band structure, slightly reaching into the otherwise empty bandgap between the low frequency edge modes and the fundamental mode. The presented phase resolved investigation of spin waves is a crucial step for spin wave manipulation in magnonic crystals.
| Item Type: | Article |
|---|---|
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 07 Sep 2022 08:58 |
| Last Modified: | 07 Sep 2022 08:58 |
| URI: | https://pred.uni-regensburg.de/id/eprint/47310 |
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