Finite temperature magnon spectra in yttrium iron garnet from a mean field approach in a tight-binding model
We study magnon spectra at finite temperature in yttrium iron garnet using a tight-binding model with nearest-neighbor exchange interaction. The spin reduction due to thermal magnon excitation is taken into account via the mean field approximation to the local spin and is found to be different at tw...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2018-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/aab951 |
| _version_ | 1797750776468078592 |
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| author | Ka Shen |
| author_facet | Ka Shen |
| author_sort | Ka Shen |
| collection | DOAJ |
| description | We study magnon spectra at finite temperature in yttrium iron garnet using a tight-binding model with nearest-neighbor exchange interaction. The spin reduction due to thermal magnon excitation is taken into account via the mean field approximation to the local spin and is found to be different at two sets of iron atoms. The resulting temperature dependence of the spin wave gap shows good agreement with experiment. We find that only two magnon modes are relevant to the ferromagnetic resonance. |
| first_indexed | 2024-03-12T16:37:48Z |
| format | Article |
| id | doaj.art-ba4b6e655b9243bb9f5b7f5da4b775dc |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:37:48Z |
| publishDate | 2018-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-ba4b6e655b9243bb9f5b7f5da4b775dc2023-08-08T14:48:50ZengIOP PublishingNew Journal of Physics1367-26302018-01-0120404302510.1088/1367-2630/aab951Finite temperature magnon spectra in yttrium iron garnet from a mean field approach in a tight-binding modelKa Shen0https://orcid.org/0000-0002-0842-5711The Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University , Beijing 100875, People’s Republic of ChinaWe study magnon spectra at finite temperature in yttrium iron garnet using a tight-binding model with nearest-neighbor exchange interaction. The spin reduction due to thermal magnon excitation is taken into account via the mean field approximation to the local spin and is found to be different at two sets of iron atoms. The resulting temperature dependence of the spin wave gap shows good agreement with experiment. We find that only two magnon modes are relevant to the ferromagnetic resonance.https://doi.org/10.1088/1367-2630/aab951spin wavesFerrimagnetismtight-binding modelspin fluctuation |
| spellingShingle | Ka Shen Finite temperature magnon spectra in yttrium iron garnet from a mean field approach in a tight-binding model New Journal of Physics spin waves Ferrimagnetism tight-binding model spin fluctuation |
| title | Finite temperature magnon spectra in yttrium iron garnet from a mean field approach in a tight-binding model |
| title_full | Finite temperature magnon spectra in yttrium iron garnet from a mean field approach in a tight-binding model |
| title_fullStr | Finite temperature magnon spectra in yttrium iron garnet from a mean field approach in a tight-binding model |
| title_full_unstemmed | Finite temperature magnon spectra in yttrium iron garnet from a mean field approach in a tight-binding model |
| title_short | Finite temperature magnon spectra in yttrium iron garnet from a mean field approach in a tight-binding model |
| title_sort | finite temperature magnon spectra in yttrium iron garnet from a mean field approach in a tight binding model |
| topic | spin waves Ferrimagnetism tight-binding model spin fluctuation |
| url | https://doi.org/10.1088/1367-2630/aab951 |
| work_keys_str_mv | AT kashen finitetemperaturemagnonspectrainyttriumirongarnetfromameanfieldapproachinatightbindingmodel |