Synthesis and Magnetic Moment of α' and γ'-Fe-N Phases with Various N Contents

Abstract

α' and γ'-Fe-N with various N contents were synthesized by using multilayer fabrication technique and the volume effect on magnetic moment for these phases was examined. The unit-cell volume of α' and γ' phases monotonously increases with increasing N content. In the case of α'-Fe-N, magnetic moment decreases with increasing unit-cell volume. This result is different from theoretical prediction. On the other hand, in the case of γ'-Fe-N, magnetic moment takes the maximum near the volume of bulk γ'-Fe₄N. In particular, the magnetic moment drops drastically near the volume of bulk γ'-Fe₄N, although unit-cell volume is almost same. This result is also different from the theory. Further experimental works including magnetic microstructural analysis are needed to answer these discrepancies.