Abstract
Artificially superstructured films (ASF’s) [niobium nitride (NbN)/iron nitride (FeN)] and [molybdenum nitride (MoN)/iron nitride (FeN)] have been prepared by an alternate reactive deposition method. The MoN/FeN ASF’s consist of γ -Mo2N layers and amorphous like iron nitride layers. The nitrogen composition of iron nitride layers is extremely poor judged from the Moessbauer measurement of MoN/FeN ASF’s. An ASF MoN(20nm)/FeN(10nm) showed ferromagnetism at room temperature and superconducting transition at 4.OK. It is suggested that ferromagnetism and superconductivity coexist below Tc. Niobium nitride layers of NbN/FeN ASF’s have a cubic structure similar to the δ-NbNx phase.
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