Anisotropy-assisted magnon condensation in ferromagnetic thin films
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866913230246379520 |
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| author | Frostad, Therese Pirro, Philipp Serga, Alexander A. Hillebrands, Burkard Brataas, Arne Qaiumzadeh, Alireza |
| author_facet | Frostad, Therese Pirro, Philipp Serga, Alexander A. Hillebrands, Burkard Brataas, Arne Qaiumzadeh, Alireza |
| contents | We theoretically demonstrate that adding an easy-axis magnetic anisotropy facilitates magnon condensation in thin yttrium iron garnet (YIG) films. Dipolar interactions in a quasi-equilibrium state stabilize room-temperature magnon condensation in YIG. Even though the out-of-plane easy-axis anisotropy generally competes with the dipolar interactions, we show that adding such magnetic anisotropy may even assist the generation of the magnon condensate electrically via the spin transfer torque mechanism. We use analytical calculations and micromagnetic simulations to illustrate this effect. Our results may explain the recent experiment on Bi-doped YIG and open a pathway toward applying current-driven magnon condensation in quantum spintronics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_05982 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Anisotropy-assisted magnon condensation in ferromagnetic thin films Frostad, Therese Pirro, Philipp Serga, Alexander A. Hillebrands, Burkard Brataas, Arne Qaiumzadeh, Alireza Mesoscale and Nanoscale Physics Materials Science We theoretically demonstrate that adding an easy-axis magnetic anisotropy facilitates magnon condensation in thin yttrium iron garnet (YIG) films. Dipolar interactions in a quasi-equilibrium state stabilize room-temperature magnon condensation in YIG. Even though the out-of-plane easy-axis anisotropy generally competes with the dipolar interactions, we show that adding such magnetic anisotropy may even assist the generation of the magnon condensate electrically via the spin transfer torque mechanism. We use analytical calculations and micromagnetic simulations to illustrate this effect. Our results may explain the recent experiment on Bi-doped YIG and open a pathway toward applying current-driven magnon condensation in quantum spintronics. |
| title | Anisotropy-assisted magnon condensation in ferromagnetic thin films |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2309.05982 |