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Magnetic field-induced martensitic transformation of Heusler-type Ni$$_2$$MnGa system

ホイスラー型Ni$$_2$$MnG系合金単結晶の磁場誘起マルテンサイト変態

井上 和子*; 山口 泰男*; 石井 慶信; 山内 宏樹; 宍戸 統悦*

Inoue, Kazuko*; Yamaguchi, Yasuo*; Ishii, Yoshinobu; Yamauchi, Hiroki; Shishido, Toetsu*

室温付近にキュリー点と一致するマルテンサイト変態点を有するホイスラー型Ni$$_2$$MnGa系合金について、単結晶のマルテンサイト変態過程に対する磁場効果を明らかにするために、8テスラまで磁場を印加して中性子回折実験を行った。その結果、マルテンサイト変態点近傍の温度において印加した磁場が、温度変化による変態と極めてよく似た効果をもたらすことを初めて見いだした。

Magnetic field effect on a Heusler-type Ni$$_2$$MnGa off-stoichiometric alloy having a martensitic transformation temperature around room temperature which is coincident with a Curie temperature has been investigated. The precess of martensitic transforation of a single crystal was investigated by neutron diffraction under the magnetic field up to 8 Tesla. It was found that the magnetic field, which is applied at a temperature near the transformation temperature, causes the martensitic transformation. The process of the transformation caused by the increase of magnetic field is quite similar to the process caused by the decrease of temperature.

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