Local temperature control of magnon frequency and direction of supercurrents in a magnon Bose-Einstein condensate
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866916000431079424 |
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| author | Schweizer, Matthias R. Kühn, Franziska L'vov, Victor S. Pomyalov, Anna von Freymann, Georg Hillebrands, Burkard Serga, Alexander A. |
| author_facet | Schweizer, Matthias R. Kühn, Franziska L'vov, Victor S. Pomyalov, Anna von Freymann, Georg Hillebrands, Burkard Serga, Alexander A. |
| contents | The creation of temperature variations in magnetization, and hence in the frequencies of the magnon spectrum in laser-heated regions of magnetic films, is an important method for studying Bose-Einstein condensation of magnons, magnon supercurrents, Bogoliubov waves, and similar phenomena. In our study, we demonstrate analytically, numerically, and experimentally that, in addition to the magnetization variations, it is necessary to consider the connected variations of the demagnetizing field. In case of a heat induced local minimum of the saturation magnetization, the combination of these two effects results in a local increase in the minimum frequency value of the magnon dispersion at which the Bose-Einstein condensate emerges. As a result, a magnon supercurrent directed away from the hot region is formed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_14476 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Local temperature control of magnon frequency and direction of supercurrents in a magnon Bose-Einstein condensate Schweizer, Matthias R. Kühn, Franziska L'vov, Victor S. Pomyalov, Anna von Freymann, Georg Hillebrands, Burkard Serga, Alexander A. Quantum Gases Mesoscale and Nanoscale Physics Applied Physics The creation of temperature variations in magnetization, and hence in the frequencies of the magnon spectrum in laser-heated regions of magnetic films, is an important method for studying Bose-Einstein condensation of magnons, magnon supercurrents, Bogoliubov waves, and similar phenomena. In our study, we demonstrate analytically, numerically, and experimentally that, in addition to the magnetization variations, it is necessary to consider the connected variations of the demagnetizing field. In case of a heat induced local minimum of the saturation magnetization, the combination of these two effects results in a local increase in the minimum frequency value of the magnon dispersion at which the Bose-Einstein condensate emerges. As a result, a magnon supercurrent directed away from the hot region is formed. |
| title | Local temperature control of magnon frequency and direction of supercurrents in a magnon Bose-Einstein condensate |
| topic | Quantum Gases Mesoscale and Nanoscale Physics Applied Physics |
| url | https://arxiv.org/abs/2311.14476 |