Kameda, M, Bauer, GEW and Barker, J orcid.org/0000-0003-4843-5516 (2022) Magnon spectrum of the amorphous ferromagnet Co4P from atomistic spin dynamics. Physical Review B, 106 (6). L060403. ISSN 2469-9950
Abstract
The gapped local minimum in the magnon dispersion, located at a finite wave number and frequency, has been observed in the amorphous ferromagnet
Co
4
P
. The feature is called a “rotonlike” excitation and has eluded explanation for decades. We overcome the limitations of previous theories by combining the reverse Monte Carlo method, to determine the atomic structure, with large-scale atomistic spin simulations. This method enables us to include atomic order and spin correlations on an equal footing. We find the rotonlike feature is actually gapless, in contrast to the gapped structure found in previous studies. The gapless feature is attributed to amorphous umklapp scattering caused by residual structural order.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | ©2022 American Physical Society. This is an author produced version of an article published in Physical Review B. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Condensed Matter (Leeds) |
Funding Information: | Funder Grant number Royal Society RF\ERE\210314 |
Depositing User: | Symplectic Publications |
Date Deposited: | 16 Aug 2022 15:30 |
Last Modified: | 17 Aug 2022 06:38 |
Status: | Published |
Publisher: | American Physical Society |
Identification Number: | 10.1103/physrevb.106.l060403 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:189957 |