Institute of Multidisciplinary Research for Advanced Materials, Tohoku University


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

    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

    Functional material
    Thin film
    Materials processing
    Structure Control
Research Subject
Improvement of properties for multi-functional thinfilms and development of novel devices

研究の背景 Background


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


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).