Magnetic Properties of Amorphous (Fe, Co, Mn)-Y Alloys

Magnetic moment m, Curie temperature Tc, density ¿, and Young´s modulus Es of amorphous Mn-Y, Fe-Y Co-Y, (Fe-Mn)80Y20, and (Fe-Co)80Y20 alloys fabricated by rapid quenching have been measured to make clear microstructures of amorphous alloys. Detailed comparison of m, Tc, ¿, and Es between amorphous alloys and corresponding crystalline compounds, and an X-ray structural analysis reveals a close correlation of an atomic short range order of both states, which is especially found in alloys with Y content less than 30 at%. A structural variation between 30 and 40 at%Y in the Fe-Y amorphous alloys is also indicated by the composition dependence of m, Tc, ¿, Es and by X-ray structure analysis.