Low Magnetic Damping of Ferrimagnetic GdFeCo Alloys

Duck Ho Kim, Takaya Okuno, Se Kwon Kim, Se Hyeok Oh, Tomoe Nishimura, Yuushou Hirata, Yasuhiro Futakawa, Hiroki Yoshikawa, Arata Tsukamoto, Yaroslav Tserkovnyak, Yoichi Shiota, Takahiro Moriyama, Kab Jin Kim, Kyoung Jin Lee, Teruo Ono

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Abstract

We investigate the Gilbert damping parameter α for rare earth (RE)-transition metal (TM) ferrimagnets over a wide temperature range. Extracted from the field-driven magnetic domain-wall mobility, α was as low as the order of 10-3 and was almost constant across the angular momentum compensation temperature TA, starkly contrasting previous predictions that α should diverge at TA due to a vanishing total angular momentum. Thus, magnetic damping of RE-TM ferrimagnets is not related to the total angular momentum but is dominated by electron scattering at the Fermi level where the TM has a dominant damping role. This low value of the Gilbert damping parameter suggests that ferrimagnets can serve as versatile platforms for low-dissipation high-speed magnetic devices.

Original languageEnglish
Article number127203
JournalPhysical Review Letters
Volume122
Issue number12
DOIs
Publication statusPublished - 2019 Mar 28

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Kim, D. H., Okuno, T., Kim, S. K., Oh, S. H., Nishimura, T., Hirata, Y., Futakawa, Y., Yoshikawa, H., Tsukamoto, A., Tserkovnyak, Y., Shiota, Y., Moriyama, T., Kim, K. J., Lee, K. J., & Ono, T. (2019). Low Magnetic Damping of Ferrimagnetic GdFeCo Alloys. Physical Review Letters, 122(12), [127203]. https://doi.org/10.1103/PhysRevLett.122.127203