Time and Temperature Dependences of the Irreversible Magnetization Losses of Sintered Pr–Dy–Fe–Co–B Magnets

The magnetization losses of the (Pr0.51Dy0.49)13.6(Fe0.64Co0.36)79.6B6.8 and (Pr0.51Dy0.49)13.4(Fe0.64Co0.36)78.8Cu1.1B6.7 magnets are studied. The alloying of the Pr–Dy–Fe–Co–B materials with copper is shown to cause a decrease in the magnetization losses in time, which is due to an increase in the coercive force.