Mössbauer study of magnetic anisotropy and structural relaxation in amorphous Fe40Ni40PxB20−x alloys

Abstract: The amorphous Fe₄₀Ni₄₀P _x B_20−x (x=0, 10, 12, 14, 17) alloys before and after annealing have been studied by means of Mssbauer spectroscopy, etc. Heat treatment of various samples were performed at 225, 250, 275, 300, 325 and 350C, respectively, for 1 h in a quartz tube in an argon atmosphere. The results show that the magnetic anisotropy and structural relaxation in amorphous Fe₄₀Ni₄₀P _x B_20−x are related to the phosphorus element concentrations involved and the annealing temperatures. A possible mechanism of two-stage relaxation processes below the glass transition temperature is discussed.