The full magnon spectrum of yttrium iron garnet
The magnetic insulator yttrium iron garnet can be grown with exceptional quality, has a ferrimagnetic transition temperature of nearly 600 K, and is used in microwave and spintronic devices that can operate at room temperature. The most accurate prior measurements of the magnon spectrum date back ne...
| Asıl Yazarlar: | , , , , , , |
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| Materyal Türü: | Journal article |
| Baskı/Yayın Bilgisi: |
Springer Nature
2017
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| _version_ | 1826276206663696384 |
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| author | Princep, A Ewings, R Ward, S Tóth, S Dubs, C Prabhakaran, D Boothroyd, A |
| author_facet | Princep, A Ewings, R Ward, S Tóth, S Dubs, C Prabhakaran, D Boothroyd, A |
| author_sort | Princep, A |
| collection | OXFORD |
| description | The magnetic insulator yttrium iron garnet can be grown with exceptional quality, has a ferrimagnetic transition temperature of nearly 600 K, and is used in microwave and spintronic devices that can operate at room temperature. The most accurate prior measurements of the magnon spectrum date back nearly 40 years, but cover only 3 of the lowest energy modes out of 20 distinct magnon branches. Here we have used time-of-flight inelastic neutron scattering to measure the full magnon spectrum throughout the Brillouin zone. We find that the existing models of the excitation spectrum fail to describe the optical magnon modes. Using a very general spin Hamiltonian, we show that the magnetic interactions are both longer-ranged and more complex than was previously understood. The results provide the basis for accurate microscopic models of the finite temperature magnetic properties of yttrium iron garnet, necessary for next-generation electronic devices. |
| first_indexed | 2024-03-06T23:10:32Z |
| format | Journal article |
| id | oxford-uuid:654e7905-b69e-470b-bae1-37e5fa60d9be |
| institution | University of Oxford |
| last_indexed | 2024-03-06T23:10:32Z |
| publishDate | 2017 |
| publisher | Springer Nature |
| record_format | dspace |
| spelling | oxford-uuid:654e7905-b69e-470b-bae1-37e5fa60d9be2022-03-26T18:24:42ZThe full magnon spectrum of yttrium iron garnetJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:654e7905-b69e-470b-bae1-37e5fa60d9beSymplectic Elements at OxfordSpringer Nature2017Princep, AEwings, RWard, STóth, SDubs, CPrabhakaran, DBoothroyd, AThe magnetic insulator yttrium iron garnet can be grown with exceptional quality, has a ferrimagnetic transition temperature of nearly 600 K, and is used in microwave and spintronic devices that can operate at room temperature. The most accurate prior measurements of the magnon spectrum date back nearly 40 years, but cover only 3 of the lowest energy modes out of 20 distinct magnon branches. Here we have used time-of-flight inelastic neutron scattering to measure the full magnon spectrum throughout the Brillouin zone. We find that the existing models of the excitation spectrum fail to describe the optical magnon modes. Using a very general spin Hamiltonian, we show that the magnetic interactions are both longer-ranged and more complex than was previously understood. The results provide the basis for accurate microscopic models of the finite temperature magnetic properties of yttrium iron garnet, necessary for next-generation electronic devices. |
| spellingShingle | Princep, A Ewings, R Ward, S Tóth, S Dubs, C Prabhakaran, D Boothroyd, A The full magnon spectrum of yttrium iron garnet |
| title | The full magnon spectrum of yttrium iron garnet |
| title_full | The full magnon spectrum of yttrium iron garnet |
| title_fullStr | The full magnon spectrum of yttrium iron garnet |
| title_full_unstemmed | The full magnon spectrum of yttrium iron garnet |
| title_short | The full magnon spectrum of yttrium iron garnet |
| title_sort | full magnon spectrum of yttrium iron garnet |
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