Abstract: The present invention provides an Fe-base soft magnetic alloy and a laminated magnetic core formed by using the alloy which contains Fe as a main component and at least one element M and B selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Mo and W, in which at least 50% of the crystalline structure comprises fine crystalline grains having an average crystal grain size of 30 nm or less and a body-centered cubic structure, and the fracture strain at 300.degree. C. or less is 1. The ratios of the components Fe, and elements M and B are 75 to 93 atomic %, 4 to 9 atomic % and 0.5 to 18 atomic %, respectively. The alloy may contain other additive elements such as Cr, Ru, Hr, Ir, Si, Al, Ge, Ga and the like.

Abstract: A soft magnetic bulky alloy according to the present invention is obtained by forming under pressure a powder and granule material mainly made of a Fe-M-B based amorphous alloy containing Fe, B and M where M is at least one element selected from a group consisting of Ti, Zr, Hf, V, Nb, Ta, Mo and W. In the soft magnetic bulky alloy, an amorphous alloy phase and a bcc phase with fine grain sizes of 30 nm or below are present in a mixed state, or the bcc phase with fine grain sizes of 30 nm or below is mainly present. The present invention also discloses a method of manufacturing such a soft magnetic bulky alloy.