Structure and magnetic properties of FeCoN films

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) and Co content on the structure and magnetic properties of FeCoN films are investigated. The phases formed in FeCoN films are strongly dependent on the substrate temperature. At T_s=100 °C, to the growth of α^′′–(Fe,Co)₁₆N₂ phase is favored. Enhancement of the formation of α^′′ phase by Co addition was observed. Films with 5–25 at.% Co contents deposited at T_s=100 °C exhibit high saturation magnetization up to the range of 2.5–2.7 T. The saturation magnetization of α^′′ alloys phase is expected to be 2.8–2.9 T, which is as large as that of α^′′–Fe₁₆N₂ reported by Sugita et al., and this confirms the high saturation magnetization of the α^′′ phase.