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日本 AEM 学会誌　Vol. 24, No.1 (2016)

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Magnetostrictive Alloys Utilized for Vibration Energy Harvesting �

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�Shigeru SUZUKI, Shun FUJIEDA, Tsuguo FUKUDA

Magnetostrictive alloys are promising materials for realizing vibration energy harvesting technology, as they enable us to convert kinetic energy to electric energy. These materials are used as smart materials for actuators and sensors. Among these materials, iron based magnetostrictive alloys are attracted since they reveal the superior magnetic properties such as large magnetostriction and high permeability, as well as the good mechanical properties. The present paper describes the present status and prospect of these magnetostrictive alloys. In particular, the physical properties such as elasticity and magnetostriction of iron-gallium binary alloys are overviewed.

Keywords: magnetostrictive alloys, vibrational power generation, magnetic domain �

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Table 1 Several properties of magnetostrictive alloys

Tb-Dy-Fe Fe-Co Fe-Ga Magnetostriction(ppm)

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Fig. 1 Abundance of elements versus atomic number.

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Fig. 4 (a) a large single crystal ingot grown by CZ process and (b) a rod shaped from an ingot.

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Fig.5 Schematic showing measurement of magnetostriction and a typical magnetostriction versus magnetic field.

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Fig. 8 Schematic illustration of magnetic domains of an Fe-Si alloy without stress (left) and under external stress (right).

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Table 3 Orientation dependence of Young’s modulus (GPa) of Fe-Ga binary alloys with different compositions.

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Fig. 9 Orientation dependence of Young’s modulus of Fe (left) and Fe-18%Ga alloy (right).

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