期刊
PHYSICAL REVIEW LETTERS
卷 122, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.127203
关键词
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资金
- JSPS KAKENHI [15H05702, 26103002, 26103004]
- Collaborative Research Program of the Institute for Chemical Research, Kyoto University
- R&D project for ICT Key Technology of MEXT from the Japan Society for the Promotion of Science (JSPS)
- Cooperative Research Project Program of the Research Institute of Electrical Communication, Tohoku University
- Overseas Researcher under the Postdoctoral Fellowship of JSPS [P16314]
- National Research Foundation of Korea [2017R1A2B2006119]
- Samsung Research Funding Center of Samsung Electronics [SRFCMA1702-02]
- KIST Institutional Program [2V05750]
- Army Research Office [W911NF-14-1-0016]
- National Research Foundation of Korea (NRF) - Korea Government (MSIP) [2017R1C1B2009686, NRF-2016R1A5A1008184]
We investigate the Gilbert damping parameter alpha for rare earth (RE)-transition metal (TM) ferrimagnets over a wide temperature range. Extracted from the field-driven magnetic domain-wall mobility, alpha was as low as the order of 10(-3) and was almost constant across the angular momentum compensation temperature T-A, starkly contrasting previous predictions that alpha( )should diverge at T-A 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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