Journal article
The full magnon spectrum of yttrium iron garnet
- Abstract:
- 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.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 1.3MB, Terms of use)
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- Publisher copy:
- 10.1038/s41535-017-0067-y
Authors
- Publisher:
- Springer Nature
- Journal:
- npj Quantum Materials More from this journal
- Volume:
- 2
- Issue:
- 1
- Article number:
- 63
- Publication date:
- 2017-11-14
- Acceptance date:
- 2017-10-18
- DOI:
- ISSN:
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2397-4648
- Pubs id:
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pubs:745730
- UUID:
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uuid:654e7905-b69e-470b-bae1-37e5fa60d9be
- Local pid:
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pubs:745730
- Source identifiers:
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745730
- Deposit date:
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2017-11-14
Terms of use
- Copyright holder:
- Princep et al
- Copyright date:
- 2017
- Notes:
- This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
- Licence:
- CC Attribution (CC BY)
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