Distinct handedness of spin wave across the compensation temperatures of ferrimagnets

Changsoo Kim, Soogil Lee, Hyun Gyu Kim, Ji Ho Park, Kyung Woong Moon, Jae Yeol Park, Jong Min Yuk, Kyung Jin Lee, Byong Guk Park, Se Kwon Kim, Kab Jin Kim, Chanyong Hwang

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)980-985
Number of pages6
JournalNature Materials
Issue number9
Publication statusPublished - 2020 Sept 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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