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

doi:10.1103/PhysRevLett.122.127203

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

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

52 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 language	English
Article number	127203
Journal	Physical review letters
Volume	122
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.122.127203
Publication status	Published - 2019 Mar 28

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.122.127203

Cite this

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title = "Low Magnetic Damping of Ferrimagnetic GdFeCo Alloys",

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.",

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

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doi = "10.1103/PhysRevLett.122.127203",

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T1 - Low Magnetic Damping of Ferrimagnetic GdFeCo Alloys

AU - Kim, Duck Ho

AU - Okuno, Takaya

AU - Kim, Se Kwon

AU - Oh, Se Hyeok

AU - Nishimura, Tomoe

AU - Hirata, Yuushou

AU - Futakawa, Yasuhiro

AU - Yoshikawa, Hiroki

AU - Tsukamoto, Arata

AU - Tserkovnyak, Yaroslav

AU - Shiota, Yoichi

AU - Moriyama, Takahiro

AU - Kim, Kab Jin

AU - Lee, Kyoung Jin

AU - Ono, Teruo

PY - 2019/3/28

Y1 - 2019/3/28

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AB - 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.

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Low Magnetic Damping of Ferrimagnetic GdFeCo Alloys

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