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Structure and magnetic properties of nanocrystalline condensates of iron obtained by pulse plasma evaporation

The main magnetic characteristics (exchange interaction A, saturation magnetization M s0 , Curie temperature T C , the local anisotropy field H a ) of nanocrystalline iron films prepared by a new method (pulse plasma evaporation in a vacuum) and their variation in the course of a heat treatment were studied. The results obtained are discussed in terms of the specific features of the atomic (and chemical) structure of these materials. The nanocrystalline Fe produced by this technique in the form of thin films was established to represent a disordered supersaturated Fe-C solid solution (with C content to 15 at. %) with an hcp symmetry of the nearest neighborhood; in the course of thermal relaxation, this solid solution becomes ordered structurally and chemically to acquire a Fe 6 C stoichiometry.