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

2 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 Sep 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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