日本金属学会誌

J. Japan Inst. Metals, Vol. 70, No. 7 (2006),
pp. 586-591

Magnetic Properties of Fe-Cu-N and Fe-Au-Cu-N Alloys Prepared by Mechanical Alloying

Shogo Umekawa1, and Hiromitsu Ino2

1College of Engineering, Hosei University, Tokyo 184-8584
2College of Engineering, Hosei University, Tokyo 184-8584

Abstract:

The aim of this study is to examine the effect of doped N and Au on the lattice parameter and the magnetic properties of FCC Fe-Cu alloys, prepared by mechanical alloying. By the measurements of X-ray diffraction, it is shown that both N and Au extend the FCC lattice. The magnetic moment and the Curie temperature of Fe-Cu-N alloys decreased drastically with increasing N content, but the magnetic moment and the Curie temperature of Fe-Au-Cu-N alloys increased with increasing Au. Analysis based on a molecular field approximation shows the exchange integral is not affected by the addition of Au, but strongly affected by the addition of N. The fact is interpreted as the result that the latter changes not only the lattice parameter but also the band structure of the alloys.


(Received 2006/1/31)

Keywords:

mechanical alloying, iron-nitrogen, lattice parameter, magnetic moment, exchange integral


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