Abstract
The dependence of soft magnetic properties on the composition and annealing temperature was studied for sputtered (Fe1-XCoX)1-YNbY (0≤X≤1.0, 0≤Y≤0.2 in weight fraction) films. The films with Y≥0.16 are amorphous while the films with 0≤X < 0.8, Y < 0.6 and 0.8≤X≤1.0, Y < 0.6 are of b.c.c. and f.c.c. structure, respectively. The lattice constant of the b.c.c. films increases with Nb content. The coercivity of the films annealed at 773 K for 3600 s exhibits a minimum of 400 A/m around Y=0.05 and X=0.3-0.8. The corresponding permeability and satuation magnetic flux density are 800 and 2 T, respectively. Coercivity depends much on the expansion of latticeconstant due to the addition of Nb and exhibits a minimum when the lattice constant of Fe-Co film is expanded 0.2%.
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