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

Research output: Contribution to journalArticle

3 Citations (Scopus)

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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magnetic damping
ferrimagnets
angular momentum
damping
transition metals
rare earth elements
temperature compensation
magnetic domains
domain wall
electron scattering
dissipation
platforms
high speed
predictions
temperature

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., ... Ono, T. (2019). Low Magnetic Damping of Ferrimagnetic GdFeCo Alloys. Physical Review Letters, 122(12), [127203]. https://doi.org/10.1103/PhysRevLett.122.127203

Low Magnetic Damping of Ferrimagnetic GdFeCo Alloys. / Kim, Duck Ho; Okuno, Takaya; Kim, Se Kwon; Oh, Se Hyeok; Nishimura, Tomoe; Hirata, Yuushou; Futakawa, Yasuhiro; Yoshikawa, Hiroki; Tsukamoto, Arata; Tserkovnyak, Yaroslav; Shiota, Yoichi; Moriyama, Takahiro; Kim, Kab Jin; Lee, Kyoung Jin; Ono, Teruo.

In: Physical Review Letters, Vol. 122, No. 12, 127203, 28.03.2019.

Research output: Contribution to journalArticle

Kim, DH, Okuno, T, Kim, SK, Oh, SH, Nishimura, T, Hirata, Y, Futakawa, Y, Yoshikawa, H, Tsukamoto, A, Tserkovnyak, Y, Shiota, Y, Moriyama, T, Kim, KJ, Lee, KJ & Ono, T 2019, 'Low Magnetic Damping of Ferrimagnetic GdFeCo Alloys', Physical Review Letters, vol. 122, no. 12, 127203. https://doi.org/10.1103/PhysRevLett.122.127203
Kim DH, Okuno T, Kim SK, Oh SH, Nishimura T, Hirata Y et al. Low Magnetic Damping of Ferrimagnetic GdFeCo Alloys. Physical Review Letters. 2019 Mar 28;122(12). 127203. https://doi.org/10.1103/PhysRevLett.122.127203
Kim, Duck Ho ; Okuno, Takaya ; Kim, Se Kwon ; Oh, Se Hyeok ; Nishimura, Tomoe ; Hirata, Yuushou ; Futakawa, Yasuhiro ; Yoshikawa, Hiroki ; Tsukamoto, Arata ; Tserkovnyak, Yaroslav ; Shiota, Yoichi ; Moriyama, Takahiro ; Kim, Kab Jin ; Lee, Kyoung Jin ; Ono, Teruo. / Low Magnetic Damping of Ferrimagnetic GdFeCo Alloys. In: Physical Review Letters. 2019 ; Vol. 122, No. 12.
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