強磁性形状記憶合金における結晶学的ドメインの磁場制御と磁歪

概要

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Shape memory alloys are now widely used because they exhibit a large recoverable strain, which is caused by conversion of crystallographic domain (variants) in martensite phase. Conversion of variants in shape memory alloys is usually promoted by an application of external stress. Recently, however, it was found that conversion of variants can also be promoted by application of a magnetic field in the martensitic state of Heusler-type ferromagnetic Ni-Mn-Ga shape memory alloys. Since then, research in this field has attracted considerable attention to applications of such materials as actuators and sensors. Furthermore, the mechanism for the conversion of variants by the magnetic field has attracted the academic interest by many researchers. In this paper, we will show giant magnetostrictive behavior studied mainly by us in single crystals of three ferromagnetic shape memory alloys, Fe-Pd, Ni_2MnGa, and Fe_3Pt.
社団法人日本磁気学会の論文
2002-08-01