Ferromagnetism of Amorphous Iron Alloys

Abstract

It is well known that ferromagnetism appears in 3d metals (Fe, Co and Ni) and alloys whose average outer electron concentration, N, ranges from about 6.5(Fe-Cr) to 10.6 (Ni-Cu). The saturation magnetization of these metals and alloys is expressed by the so-called Slater Pauling curve. The crystal structure of these alloys in ordinary phases is generally body centered cubic or face centered cubic for N < 8.5 or N > 8.7 respectively. There is some dincontinuity between the saturation moment of bcc alloys and that of fcc alloys. The Curie temperature is much more sensitive to the crystal structure. There are interesting topics for Invar alloys in a region close to the phase boundary between fcc and bcc phase.¹ The magnetic properties of metals and alloys are necessarily affected by their crystal structures.