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

虽然Fe-Ga薄带与一些添加剂的晶粒细化的研究，从带的研究对象转移到Fe-Ga薄膜，因为一些不需要的晶相退火带中观察到。电沉积Fe-Ga薄膜很少报道，因为镓很难从水溶液中电沉积。在这项研究中，我们调查的磁性和结构特性的Fe-Ga膜制备的新的电镀浴中没有有毒物质的环境部在日本的条例规定。因此，具有合适Ga含量的厚Fe-Ga膜的范围为10 - 35 at.%获得了利用添加剂来细化电沉积薄膜的晶粒尺寸是我们未来的研究方向之一。为了阐明Fe-Ga合金的微观结构与磁性能之间的关系，模拟了晶粒尺寸对磁性能的影响。结果表明，随着晶粒尺寸的减小，Fe-Ga合金的矫顽力略有降低，而Terfenol-D合金的矫顽力急剧下降。

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.