Journal
APPLIED PHYSICS EXPRESS
Volume 12, Issue 9, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.7567/1882-0786/ab33d5
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Funding
- JSPS KAKENHI [15H05702, 17H04924, 17H05181, 26103002, 26103004]
- Collaborative Research Program of the Institute for Chemical Research, Kyoto University
- RAMP
- 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
- University of Missouri
- JSPS [P16314]
- National Research Foundation of Korea [2017R1A2B2006119]
- KAIST
- National Research Foundation of Korea [2017R1A2B2006119] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Austrian Science Fund (FWF) [P16314] Funding Source: Austrian Science Fund (FWF)
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We provide a macroscopic theory and experimental results for magnetic resonances of antiferromagnetically-coupled ferrimagnets. Our theory, which interpolates the dynamics of antiferromagnets and ferromagnets smoothly, can describe ferrimagnetic resonances across the angular momentum compensation point. We also present experimental results for spin-torque induced ferrimagnetic resonance at several temperatures. The spectral analysis based on our theory reveals that the Gilbert damping parameter, which has been considered to be strongly temperature dependent, is insensitive to temperature. We envision that our work will facilitate further investigation of ferrimagnetic dynamics by providing a theoretical framework suitable for a broad range of temperatures. (C) 2019 The Japan Society of Applied Physics
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