Negative-energy spin waves in antiferromagnets for spin-current amplification and analogue gravity
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866929337734791168 |
|---|---|
| author | Errani, Valentina Schoenmaker, Steven H. Wang, Xiangrong R. Gomonay, Olena Duine, Rembert A. |
| author_facet | Errani, Valentina Schoenmaker, Steven H. Wang, Xiangrong R. Gomonay, Olena Duine, Rembert A. |
| contents | Magnonic black holes-analogue event horizons for the spin-wave collective excitations of ordered magnets-can be used for fundamental research, for example for investigating Hawking radiation, but also for technological applications of spin waves. Here we show how to engineer a horizon for spin waves in antiferromagnets, which have the attractive feature of fast magnetization dynamics and linear dispersion relation. We propose a set-up with spatially varying exchange interaction with spin transfer torque to implement the horizon and a second set-up for the amplification of spin waves consisting of an antiferromagnet subject to a spatially varying external magnetic field that is driven by spin orbit torque. We compute the values of parameters needed to implement the horizon and to have amplification of spin waves. We develop the corresponding Klein-Gordon equation and quantify the amplification. Our work paves the way for investigation of Hawking radiation of spin waves and for antiferromagnet-based spin-waves amplifiers. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_04996 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Negative-energy spin waves in antiferromagnets for spin-current amplification and analogue gravity Errani, Valentina Schoenmaker, Steven H. Wang, Xiangrong R. Gomonay, Olena Duine, Rembert A. Mesoscale and Nanoscale Physics Magnonic black holes-analogue event horizons for the spin-wave collective excitations of ordered magnets-can be used for fundamental research, for example for investigating Hawking radiation, but also for technological applications of spin waves. Here we show how to engineer a horizon for spin waves in antiferromagnets, which have the attractive feature of fast magnetization dynamics and linear dispersion relation. We propose a set-up with spatially varying exchange interaction with spin transfer torque to implement the horizon and a second set-up for the amplification of spin waves consisting of an antiferromagnet subject to a spatially varying external magnetic field that is driven by spin orbit torque. We compute the values of parameters needed to implement the horizon and to have amplification of spin waves. We develop the corresponding Klein-Gordon equation and quantify the amplification. Our work paves the way for investigation of Hawking radiation of spin waves and for antiferromagnet-based spin-waves amplifiers. |
| title | Negative-energy spin waves in antiferromagnets for spin-current amplification and analogue gravity |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2405.04996 |