Abstract
Fe–Ni alloy films with a composition of Invar region were prepared on copper substrates by electrodeposition. The crystal structures and magnetic properties of the films were investigated. The region which formed α phase in the films was different from that shown in the equilibrium phase diagram for bulk samples of Fe–Ni system, that is, the region shifts toward the nickel richer composition. The drop region the magnetization in the electrodeposited film shows a tendency to shift to the nickel richer composition (45 at.%Ni–Fe) corresponding with the shift of the α phase at the film deposition. The magnetic moment at low temperatures in the electrodeposited film decreases more rapidly with the increase of temperature as compared with the result observed in the bulk crystal.
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