Mechanism of inverse magnetostrictive effect in iron-based alloy single crystals with small magnetostriction and development of inverse magnetostrictive materials

2023 Fiscal Year Final Research Report

• Project/Area Number: 20H02424
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 26010:Metallic material properties-related
• Research Institution: Osaka University
• Principal Investigator: Fujieda Shun 大阪大学, 大学院工学研究科, 特任准教授(常勤) (60551893)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 磁性・電子・情報材料 / 逆磁歪効果 / 振動発電

Outline of Final Research Achievements

Vibration energy harvesting using the inverse magnetostrictive effect of Fe-Ga alloys has attracted significant attention, because it can generate electrical energy from ambient vibration. The Fe-Si alloys show smaller magnetostriction when compared with Fe-Ga alloys. However, the saturation magnetization and magnetic susceptibility of the former are larger than those of the latter. In this study, the influence of crystal orientation of an Fe-Si alloy on vibration power generation properties was investigated using a U-shaped unimorph device. In addition, we also developed an evaluation system of the inverse magnetostrictive effect. The change in magnetic flux density due to the inverse magnetostrictive effect was directly evaluated by this system.

Free Research Field

磁性材料

Academic Significance and Societal Importance of the Research Achievements

従来、振動発電用の材料である逆磁歪材料として、磁歪の大きな磁歪材料の応用が注目されてきたが、本研究により磁歪の小さい材料でも応用の可能性があることが明らかになった。また、本研究で独自に構築した評価システムにより、逆磁歪効果の詳細な検討が可能であることを示した。これらの成果により逆磁歪材料の開発が進展し、振動発電デバイスの多様な利用方法および利用環境に合わせて最適な材料が選択できるようになれば、振動発電エナジーハーベスティングのさらなる普及が期待される。