Distinct handedness of spin wave across the compensation temperatures of ferrimagnets.
Journal
Nature materials
ISSN: 1476-4660
Titre abrégé: Nat Mater
Pays: England
ID NLM: 101155473
Informations de publication
Date de publication:
Sep 2020
Sep 2020
Historique:
received:
07
11
2019
accepted:
01
06
2020
pubmed:
1
7
2020
medline:
1
7
2020
entrez:
1
7
2020
Statut:
ppublish
Résumé
Antiferromagnetic spin waves have been predicted to offer substantial functionalities for magnonic applications due to the existence of two distinct polarizations, the right-handed and left-handed modes, as well as their ultrafast dynamics. However, experimental investigations have been hampered by the field-immunity of antiferromagnets. Ferrimagnets have been shown to be an alternative platform to study antiferromagnetic spin dynamics. Here we investigate thermally excited spin waves in ferrimagnets across the magnetization compensation and angular momentum compensation temperatures using Brillouin light scattering. Our results show that right-handed and left-handed modes intersect at the angular momentum compensation temperature where pure antiferromagnetic spin waves are expected. A field-induced shift of the mode-crossing point from the angular momentum compensation temperature and the gyromagnetic reversal reveal hitherto unrecognized properties of ferrimagnetic dynamics. We also provide a theoretical understanding of our experimental results. Our work demonstrates important aspects of the physics of ferrimagnetic spin waves and opens up the attractive possibility of ferrimagnet-based magnonic devices.
Identifiants
pubmed: 32601483
doi: 10.1038/s41563-020-0722-8
pii: 10.1038/s41563-020-0722-8
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
980-985Subventions
Organisme : National Research Foundation of Korea (NRF)
ID : 2015M3D1A1070467
Organisme : National Research Foundation of Korea (NRF)
ID : 2019M3F3A1A02072476
Organisme : National Research Foundation of Korea (NRF)
ID : 2020R1A2C4001789
Organisme : University of Missouri-St. Louis (UMSL)
ID : URC-19-090
Organisme : National Research Council of Science and Technology (National Research Council of Science & Technology)
ID : CAP-16-01-KIST
Commentaires et corrections
Type : ErratumIn
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