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Magnetic Properties in Fe-Ni Invar Alloys Irradiated by High-Energy Ions

Published online by Cambridge University Press:  01 February 2011

Fumihisa Ono
Affiliation:
Department of Physics, Okayama University, 3–1–1 Tsushima-Naka, Okayama 700–8530, Japan
Seiji Komatsu
Affiliation:
Department of Physics, Okayama University, 3–1–1 Tsushima-Naka, Okayama 700–8530, Japan
Yasuhiro Chimi
Affiliation:
Department of Materials Science, Japan Atomic Energy Research Institute, Tokai, Ibaraki, Japan
Norito Ishikawa
Affiliation:
Department of Materials Science, Japan Atomic Energy Research Institute, Tokai, Ibaraki, Japan
Tadashi Kambara
Affiliation:
Atomic Physics Laboratory, The Institute of Physical and Chemical Research, Wako, Saitama, Japan
Akihiro Iwase
Affiliation:
Research Institute for Advanced Science and Technology, Osaka Prefecture University, Sakai, Osaka, Japan
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Abstract

Anomalously large shift of the Curie temperature has recently been observed in Fe-Ni Invar alloys irradiated with high-energy heavy ions. This large effect can be attributed to the large positive magneto-volume effect essentially originated in the itinerant electron ferromagnetism in Fe-Ni Invar alloys. To investigate the mechanism of the large modification of the ferromagnetism and the structure of the modified portion, measurements of the beam energy dependence of AC-susceptibility-temperature curves have been made. It was found that the amount of the shift of the Curie temperature did not change by increasing the beam energy. On the contrary, the intensity of the susceptibility of the modified portion increased with increasing the ion beam energy. The high-density electronic excitation is considered to be responsible for the large modification of the ferromagnetism in Fe-Ni Invar alloys.

Type
Research Article
Copyright
Copyright © Materials Research Society 2004

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