Temperature dependence of magnetic resonance in ferrimagnetic GdFeCo alloys

Takaya Okuno, Se Kwon Kim, Takahiro Moriyama, Duck Ho Kim, Hayato Mizuno, Tetsuya Ikebuchi, Yuushou Hirata, Hiroki Yoshikawa, Arata Tsukamoto, Kab Jin Kim, Yoichi Shiota, Kyung Jin Lee, Teruo Ono

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number093001
JournalApplied Physics Express
Volume12
Issue number9
DOIs
Publication statusPublished - 2019 Sept 1

Bibliographical note

Funding Information:
This work was supported by the JSPS KAKENHI (Grants No. 15H05702, No. 17H04924, No. 17H05181, No. 26103002, and No. 26103004), Collaborative Research Program of the Institute for Chemical Research, Kyoto University, and R & D project for ICT Key Technology of MEXT from the Japan Society for the Promotion of Science (JSPS). This work was partly supported by The Cooperative Research Project Program of the Research Institute of Electrical Communication, Tohoku University. S. K. K. was supported by the startup fund at the University of Missouri. D. H. K. was supported as an Overseas Researcher under the Postdoctoral Fellowship of JSPS (Grant No. P16314). K. J. L. was supported by the National Research Foundation of Korea (2017R1A2B2006119). K. J. K. was supported by the KAIST-funded Global Singularity Research Program for 2019.

Publisher Copyright:
© 2019 The Japan Society of Applied Physics.

ASJC Scopus subject areas

  • General Engineering
  • General Physics and Astronomy

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