Spin wave localization and guiding by magnon band structure engineering in yttrium iron garnet
| Autor: | Niklas Liebing, Andreas Müller, Rouven Dreyer, Eric Edwards, Georg Woltersdorf |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Condensed Matter - Mesoscale and Nanoscale Physics Physics and Astronomy (miscellaneous) Condensed matter physics Spintronics Magnon Relaxation (NMR) Yttrium iron garnet FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences chemistry.chemical_compound chemistry Spin wave 0103 physical sciences Dispersion (optics) Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Group velocity General Materials Science Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Electronic band structure |
| DOI: | 10.48550/arxiv.1803.04943 |
| Popis: | In spintronics the propagation of spin-wave excitations in magnetically ordered materials can also be used to transport and process information. One of the most popular materials in this regard is the ferrimagnetic insulator yttrium-iron-garnet due its exceptionally small spin-wave damping parameter. While the small relaxation rate allows for large propagation length of magnetic excitations, it also leads to non-locality of the magnetic properties. By imaging spin waves their band structure is mapped. In doing so wave vector selection is shown to suppress dispersion effects to a large extent allowing for local measurements of spin relaxation. Moreover we demonstrate even higher control of magnon propagation by employing the wave vector selectivity near an avoided crossing of different spin-wave modes where the group velocity approaches zero. Here local engineering of the dispersion allows constructing magnonic waveguides and at the same time reveals the local relaxation properties. Comment: 18 pages, 5 figures |
| Databáze: | OpenAIRE |
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