Mössbauer study on the magnetic state of iron particles in Fe-N and Fe-Zr-N soft magnetic thin films
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The magnetic state of α-Fe particles and the behaviour of nitrogen and zirconium during annealing in Fe96N4 and Fe85.6Zr7.6N6.8 magnetic thin films have been studied by conversion electron Mössbauer spectroscopy for 57Fe. The crystalline phases present in the Fe-N annealed films were α-Fe and γ′-Fe4N, and those in the Fe-Zr-N annealed films were α-Fe and ZrN. In the Fe-N films annealed below 300°C, about 60% nitrogen is incorporated interstitially into α-Fe and the rest is used for the formation of γ′-Fe4N. In the Fe-N film annealed at 500°C, almost all nitrogen participates in the formation of γ-Fe4N, leading to the grain growth of α-Fe particles and an increase in coercive force. The values (291–325 kOe) of internal magnetic field of iron sites in α-Fe in the Fe-Zr-N films are much smaller than that (333 kOe) of the iron site in pure α-Fe. Even if the Fe-Zr-N films were annealed at 500–700°C, some zirconium and nitrogen is still incorporated substitutionally and interstitially into α-Fe, respectively. In particular, the substitutional zirconium depresses the grain growth of α-Fe particles, perhaps due to a chemical interaction between zirconium and iron.
KeywordsNitrogen Iron Magnetic Field Zirconium Crystalline Phase
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