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Pressure dependence of the irradiation-induced ferromagnetism in Fe-Ni invar alloys

Fe-Niインバー合金における照射誘起強磁性の圧力依存性

松島 康*; Sun, N. Q.*; 金光 裕昭*; 松下 正史*; 岩瀬 彰宏*; 知見 康弘; 石川 法人   ; 神原 正*; 小野 文久*

Matsushima, Yasushi*; Sun, N. Q.*; Kanamitsu, Hiroaki*; Matsushita, Masafumi*; Iwase, Akihiro*; Chimi, Yasuhiro; Ishikawa, Norito; Kambara, Tadashi*; Ono, Fumihisa*

近年見いだされたFe-Niインバー合金における照射誘起強磁性について、圧力依存性を7.5GPaまでの静水圧下で調べた。試料は、Fe-30.2at% Niインバー合金板に80MeV Xeイオンを照射し、照射領域のキュリー温度が63K上昇したものである。キュリー温度は圧力が高くなるにつれて降下するが、その降下量の圧力依存性から、照射によって誘起された強磁性が遍歴電子によること(遍歴電子強磁性)がわかった。

Pressure dependence of the irradiation-induced ferromagnetism recently found in Fe-Ni invar alloys was investigated under hydrostatic pressures up to 7.5 GPa. A rectangular sheet of Fe-30.2at% Ni invar alloy was irradiated with 80-MeV Xe ions. The range was much smaller than the thickness of the sample. The Curie temperature of the irradiated part increased by 63 K, and the absolute value of the pressure coefficient, d$$T$$$$_{rm c}$$/d$$p$$ was smaller than that of non-irradiated part. The relation $$p$$ $$approx$$ ($$T$$$$_{rm c0}$$ - $$T$$$$_{rm c}$$)$$^{n}$$ holds with n = 2 for both non-irradiated and irradiated part. The itinerant character was not so much modified by irradiation.

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パーセンタイル:32.73

分野:Materials Science, Multidisciplinary

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