Magnetic Properties of New High Coercivity Cu–Mn–Sb Alloys

抄録

Magnetic properties of Cu–Mn–Sb alloys containing 4.98∼59.80% Mn and 10.03∼79.71% Sb have been measured. It has been found that the alloys consisting of about 17∼40% Mn, 10∼54% Sb and 9∼65% Cu show high coercivity when tempered at 150°∼650°C after chill-casting and the alloy consisting of 22.04% Mn, 33.00% Sb and the rest Cu exhibits the highest coercive force _IH_C of 2000 Oe and a residual intensity of magnetization Ir of 12 e.m.u. It has further been determined by means of electron microscopic observation and X-ray analysis that these high-coercivity alloys contain many acicular fine particles of the ferrimagnetic compound Mn₂Sb dispersed in the matrix of the nonmagnetic α_Cu phase. The high coercivity of these alloys is probably caused by the energies of crystal magnetic anisotropy and shape magnetic anisotropy of these small particles composed of a single magnetic domain.