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タイトル: | Generation of third-harmonic spin oscillation from strong spin precession induced by terahertz magnetic near fields |
著者: | Zhang, Zhenya Sekiguchi, Fumiya Moriyama, Takahiro Furuya, Shunsuke C. Sato, Masahiro Satoh, Takuya Mukai, Yu Tanaka, Koichiro https://orcid.org/0000-0002-2132-8318 (unconfirmed) Yamamoto, Takafumi Kageyama, Hiroshi Kanemitsu, Yoshihiko https://orcid.org/0000-0002-0788-131X (unconfirmed) Hirori, Hideki https://orcid.org/0000-0001-6056-8675 (unconfirmed) |
著者名の別形: | 章, 振亜 関口, 文哉 森山, 貴広 古谷, 峻介 佐藤, 正寛 佐藤, 琢哉 向井, 佑 田中, 耕一郎 山本, 隆文 陰山, 洋 金光, 義彦 廣理, 英基 |
キーワード: | Magnetic properties and materials Magneto-optics Ultrafast photonics |
発行日: | 2023 |
出版者: | Springer Nature |
誌名: | Nature Communications |
巻: | 14 |
論文番号: | 1795 |
抄録: | The ability to drive a spin system to state far from the equilibrium is indispensable for investigating spin structures of antiferromagnets and their functional nonlinearities for spintronics. While optical methods have been considered for spin excitation, terahertz (THz) pulses appear to be a more convenient means of direct spin excitation without requiring coupling between spins and orbitals or phonons. However, room-temperature responses are usually limited to small deviations from the equilibrium state because of the relatively weak THz magnetic fields in common approaches. Here, we studied the magnetization dynamics in a HoFeO₃ crystal at room temperature. A custom-made spiral-shaped microstructure was used to locally generate a strong multicycle THz magnetic near field perpendicular to the crystal surface; the maximum magnetic field amplitude of about 2 T was achieved. The observed time-resolved change in the Faraday ellipticity clearly showed second- and third-order harmonics of the magnetization oscillation and an asymmetric oscillation behaviour. Not only the ferromagnetic vector M but also the antiferromagnetic vector L plays an important role in the nonlinear dynamics of spin systems far from equilibrium. |
記述: | テラヘルツ波とスピン振動の高効率な結合による巨大スピン応答の観測 --超高速スピントロニクス応用への期待--. 京都大学プレスリリース. 2023-04-03. |
著作権等: | © The Author(s) 2023 This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. |
URI: | http://hdl.handle.net/2433/281545 |
DOI(出版社版): | 10.1038/s41467-023-37473-1 |
PubMed ID: | 37002210 |
関連リンク: | https://www.kyoto-u.ac.jp/ja/research-news/2023-04-03 |
出現コレクション: | 学術雑誌掲載論文等 |
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