IMRAM

Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

東北大学
多元物質科学研究所

LAST UPDATE 2021/05/06

  • 研究者氏名
    Researcher Name

    大塚誠　Makoto OHTSUKA
    准教授　Associate Professor

  • 所属
    Professional Affiliation

    東北大学多元物質科学研究所
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

    金属資源プロセス研究センター 高温材料物理化学研究分野
    Center for Mineral Processing and Metallurgy,  High-temperature Physical Chemistry of Materials

  • 研究キーワード
    Research Keywords

    機能性材料
    薄膜材料
    材料プロセシング
    組織制御
    Functional material
    Thin film
    Materials processing
    Structure Control
研究テーマ
Research Subject
多機能性薄膜材料の高機能化と新規デバイスの開発
Improvement of properties for multi-functional thinfilms and development of novel devices

研究の背景 Background

強磁性形状記憶合金は形状記憶効果，超弾性，強磁性の多機能性を有し，温度や応力だけでなく磁場によりマルテンサイト変態や双晶バリアントの再配列を生じます．磁場誘起形状記憶効果を利用することで遠隔操作や応答速度の向上が可能となります．強磁性形状記憶合金薄膜は磁気駆動アクチュエータやセンサーなどの新規デバイスへの応用が期待されています．

Ferromagnetic shape memory alloys (FSMAs) show multi functionalities such as shape memory effect (SME), superelasticity and ferromagnetism. The martensitic transformation and re-orientation of twin variant in the FSMAs occur not only by temperature and stress but also by magnetic field (MF). The MF-induced SME of FSMAs will enable remote control and quick response. FSMA films are attractive materials to use noble devices of magnetic-driven actuators, sensors, etc.

研究の目標 Outcome

強磁性形状記憶合金膜（例，Ni-Mn-Ga合金膜）において温度および磁場による2方向形状記憶効果を確認しています．本研究では，マクロ・ミクロ組織，表面・界面構造を制御して多機能性薄膜の高機能化を目指しています．また，熱－磁気－機械的特性を利用した新規デバイス（アクチュエータ，センサー，環境発電デバイス）の開発を行っています．

FSMA films (ex. Ni-Mn-Ga alloy films) show two-way shape memory effect by temperature and magnetic field. In the present study, macro/micro-structure, surface/interface structure will be controlled to improve the properties of multifunctional thin films. Noble devices (actuator, sensor, energy harvesting devices, etc.) will be developed by the use of strong coupling among thermal-magnetic-mechanical properties.

研究図Research Figure

Fig. 1 Schematic diagram of martensitic transformation and shape memory effect by magnetic field. Fig. 2 Magnetic-field induced two-way shape memory effect of Ni-Mn-Ga film. Fig. 3 Strain-magnet field curve of Ni-Mn-Ga film at around martensitic transformation temperature.

文献 / Publications

Mater. Sci. Eng. A, 378, 377 (2004), Sens. Actuators A, 114, 445 (2004), Mater. Trans., 47, 625 (2006), Sens. Actuator A, 135, 92 (2007),
Mater. Sci. Eng. A, 481, 275 (2008), Smart Mater. Struct., 18 104016 (2009), Transducers 2013, IEEE, 2803 (2013), Adv. Energy Mater., 4, 1400751 (2014).

研究者HP