2025-09-19 大阪大学,慶應義塾大学,名古屋大学,京都工芸繊維大学,科学技術振興機構
図1 本研究で実証したハーフメタル材料/圧電体界面マルチフェロイク構造(左)と磁化ダイナミクスの電界変調の概念図(右)。電界の制御(ON/OFF)で圧電体の結晶の歪みが磁性体中に伝搬することで、磁性体中の磁化ダイナミクス(磁化の歳差運動)が変調される。
＜関連情報＞
- https://www.keio.ac.jp/ja/press-releases/2025/9/19/28-169375/
- https://www.keio.ac.jp/ja/press-releases/files/2025/9/19/250919-2.pdf
- https://advanced.onlinelibrary.wiley.com/doi/10.1002/advs.202511250
エピタキシャルCo2FeSi/LiNbO3マルチフェロイックヘテロ構造における低減衰定数の電場制御Electric-Field Control of Low Damping Constant in Epitaxial Co2FeSi/LiNbO3 Multiferroic Heterostructures
Shinya Yamada, Takamasa Usami, Sachio Komori, Yoshio Miura, Kazuto Yamanoi, Yukio Nozaki, Tomoyasu Taniyama, Kohei Hamaya
Advanced Science Published: 17 September 2025
DOI:https://doi.org/10.1002/advs.202511250
Abstract
To develop electric-field control of magnetization dynamics in a magnetic material for magnonic devices with low-energy power consumption operation, an epitaxial half-metallic Co2FeSi/LiNbO3 multiferroic heterostructure is experimentally demonstrated. The epitaxial Co2FeSi/LiNbO3 multiferroic heterostructure shows a low damping constant (α) of ∼0.006 and the value of α is decreased to ∼0.004 by applying an electric field. This means that the magnetization dynamics in an epitaxial half-metallic Co2FeSi layer can be controlled via the piezoelectric strain of LiNbO3 through the magnetoelastic coupling. This study leads to a way toward the realization of magnonic devices with low-energy power consumption operation.
