Nonlinear acoustic spin pumping caused by temperature-dependent frequency shifts of surface acoustic waves
The resonant frequencies of surface acoustic wave (SAW) peaks are known to shift with temperature due to the change in sound velocity of a piezoelectric substrate. Here, we demonstrate that the previously observed nonlinear power dependence of spin current generated by SAWs is a consequence of frequ...
| Authors: | , , , , |
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| Format: | article |
| Publication Date: | 2023 |
| Country: | España |
| Institution: | Universidad Autónoma de Madrid |
| Repository: | Biblos-e Archivo. Repositorio Institucional de la UAM |
| Language: | English |
| OAI Identifier: | oai:repositorio.uam.es:10486/709261 |
| Online Access: | http://hdl.handle.net/10486/709261 https://dx.doi.org/10.7566/JPSJ.92.094702 |
| Access Level: | Open access |
| Keyword: | Yttrium-Iron Garnet Spin Hall Effect Seebeck Effect Física |
| Summary: | The resonant frequencies of surface acoustic wave (SAW) peaks are known to shift with temperature due to the change in sound velocity of a piezoelectric substrate. Here, we demonstrate that the previously observed nonlinear power dependence of spin current generated by SAWs is a consequence of frequency shifts of SAW peaks due to heating generated at the interdigital transducers. Furthermore, we have observed the emergence of higher-frequency peaks and changes in peak shapes, specifically at high input power. These phenomena are exclusively apparent when utilizing an acoustic cavity constructed with acoustic Bragg reflector gratings. Our systematic study aims at assisting in a deeper understanding of SAW devices in spintronics, particularly, when using acoustic cavities |
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