Magnetic properties of annealed FeNiZrCuB alloys

Abstract The aim of this work was to study the influence of the Ni content in Fe 86− x Ni x Zr 7 Cu 1 B 6 ( x =5–86 at% ) alloys on the magnetic properties after annealing at various temperatures. The annealing temperatures were estimated from DSC measurements. It was found that the first crystallization peak T x 1 decreases with increasing Ni content. The composition dependence of the coercivity and the magnetization at room temperature were investigated, too. After the heat treatment, the magnetization J max ( x ) decreases with increasing Ni content in contrary to the bell-shaped dependence of J max ( x ) in the as cast state. The concentration dependence (5–65 at% Ni ) of the coercivity H C ( x ) of annealed samples shows the same bell-type behaviour like those in the amorphous state. The coercivity of the annealed sample with 5 at% of Ni is smaller than H C ( x ) of the as-cast state. For higher concentrations of Ni the coercivity increases with annealing. The change of the coercivity was investigated for 25, 33, 43 at% of Ni at various annealing temperatures. In those cases, the coercivity increases with increasing annealing temperature up to temperatures corresponding to the first crystallization peak at which the coercivity reaches the maximum value.