Development of a novel magnetostractive material using the exchange softening effect by magnetostriction

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Although Fe-Ga ribbons with some additives were investigated for refining the grain size, the research target was shifted from the ribbons to the Fe-Ga films since some unrequired crystalline phases were observed in the annealed ribbons. Electrodeposited Fe-Ga films are rarely reported since gallium is very difficult to electrodeposit from aqueous solutions. In this study, we investigated magnetic and structural properties of the Fe-Ga film prepared from a new plating bath without toxic substances specified by an Ordinance of the Ministry of the Environment in Japan. Consequently, thick Fe-Ga films with the suitable Ga content range from 10 to 35 at.% were obtained. Refinement of grain size in the electrodeposited films by additives is one of our future works. In order to clarify the relationship between microstructure and magnetic property in an Fe-Ga alloy, grain size dependence of coercivity was simulated. Consequently, it is found that the coercivity of the Fe-Ga alloy decreases slightly with decreasing the grain size whereas the coercivity of Terfenol-D decreases drastically.