Spin orientation and magnetostriction of Tb1−xDyxFe2 from first principles
The optimal amount of dysprosium in the highly magnetostrictive rare-earth compounds Tb1−xDyxFe2 for room-temperature applications has long been known to be x = 0.73 (Terfenol-D). Here, we derive this value from first principles by calculating the easy magnetization direction and magnetostriction as...
| Prif Awduron: | , , |
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| Fformat: | Journal article |
| Iaith: | English |
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American Physical Society
2020
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| _version_ | 1826302573222559744 |
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| author | Patrick, CE Marchant, GA Staunton, JB |
| author_facet | Patrick, CE Marchant, GA Staunton, JB |
| author_sort | Patrick, CE |
| collection | OXFORD |
| description | The optimal amount of dysprosium in the highly magnetostrictive rare-earth compounds Tb1−xDyxFe2 for room-temperature applications has long been known to be x = 0.73 (Terfenol-D). Here, we derive this value from first principles by calculating the easy magnetization direction and magnetostriction as a function of composition and temperature. We use crystal-field coefficients obtained within density-functional theory to construct phenomenological anisotropy and magnetoelastic constants. The temperature dependence of these constants is obtained from disordered-local-moment calculations of the rare-earth magnetic order parameter. Our calculations find the critical Dy concentration required to switch the magnetization direction at room temperature to be xc = 0.78, with magnetostrictions λ111 = 2700 and λ100 = −430 ppm, close to the Terfenol-D values. |
| first_indexed | 2024-03-07T05:49:38Z |
| format | Journal article |
| id | oxford-uuid:e86c11c0-1acd-4e90-9bf5-c7ca22f459b1 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:49:38Z |
| publishDate | 2020 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:e86c11c0-1acd-4e90-9bf5-c7ca22f459b12022-03-27T10:46:32ZSpin orientation and magnetostriction of Tb1−xDyxFe2 from first principlesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:e86c11c0-1acd-4e90-9bf5-c7ca22f459b1EnglishSymplectic ElementsAmerican Physical Society2020Patrick, CEMarchant, GAStaunton, JBThe optimal amount of dysprosium in the highly magnetostrictive rare-earth compounds Tb1−xDyxFe2 for room-temperature applications has long been known to be x = 0.73 (Terfenol-D). Here, we derive this value from first principles by calculating the easy magnetization direction and magnetostriction as a function of composition and temperature. We use crystal-field coefficients obtained within density-functional theory to construct phenomenological anisotropy and magnetoelastic constants. The temperature dependence of these constants is obtained from disordered-local-moment calculations of the rare-earth magnetic order parameter. Our calculations find the critical Dy concentration required to switch the magnetization direction at room temperature to be xc = 0.78, with magnetostrictions λ111 = 2700 and λ100 = −430 ppm, close to the Terfenol-D values. |
| spellingShingle | Patrick, CE Marchant, GA Staunton, JB Spin orientation and magnetostriction of Tb1−xDyxFe2 from first principles |
| title | Spin orientation and magnetostriction of Tb1−xDyxFe2 from first principles |
| title_full | Spin orientation and magnetostriction of Tb1−xDyxFe2 from first principles |
| title_fullStr | Spin orientation and magnetostriction of Tb1−xDyxFe2 from first principles |
| title_full_unstemmed | Spin orientation and magnetostriction of Tb1−xDyxFe2 from first principles |
| title_short | Spin orientation and magnetostriction of Tb1−xDyxFe2 from first principles |
| title_sort | spin orientation and magnetostriction of tb1 xdyxfe2 from first principles |
| work_keys_str_mv | AT patrickce spinorientationandmagnetostrictionoftb1xdyxfe2fromfirstprinciples AT marchantga spinorientationandmagnetostrictionoftb1xdyxfe2fromfirstprinciples AT stauntonjb spinorientationandmagnetostrictionoftb1xdyxfe2fromfirstprinciples |