chapter  4
54 Pages

Magnetism In Transition Metal Base Amorphous Alloys

WithJ. Durand

This chapter reviews the magnetic properties of transition-metal base amorphous alloys. It discusses the effect of structural disorder on magnetism in dilute and concentrated amorphous alloys. In most of crystalline alloys, the onset of long-range magnetic ordering as a function of magnetic impurity concentration is approached in an inhomogeneous way. The dilute impurity problem and the long-range magnetism in transition metals historically have been treated on different theoretical grounds. That the short-range order is basically the same around the transition-metal sites in an amorphous alloy and in its crystalline counterpart can be inferred by studying the hyperfine field distribution in the magnetically ordered state. The knowledge of the average local symmetry about transition-metal and glass-former atoms can be reached through experimental investigations of the electric field gradients. The chapter summarizes what can be inferred from magnetic measurements about the special role played by the eutectic composition in the atomic-scale structure of amorphous alloys.