Cu induced coercivity enhancement in the low viscosity GdCo5−xCux system

Abstract We investigate the influence of Cu substitution, on the coercivity and magnetic viscosity, in the ternary system GdCo 5− x Cu x ( x =0, 0.5, 1, 1.5, 2 and 2.5) with different field sweep rates. All samples have been studied in the as cast state and crystallize in a single phase CaCu 5 structure. With Cu addition, the coercivity was 10 times enhanced for x =1.5. The behavior of the coercivity H c against field sweep rate, d H /d t , shows that the GdCo 5− x Cu x system exhibits only a small magnetic viscosity effect, a desirable property for magnetic dynamic applications under high magnetic field.