Magnetic Characteristics of Sintered (Pr,Dy)–(Fe,Co,Cu)–B Materials with Various Copper Contents as Functions of the Annealing Temperature

Resumo

The effect of copper alloying on the coercive force and the residual induction of sintered materials (Pr_0.53Dy_0.47)₁₃(Fe_0.64Co_0.36)_resCu_xB₆ (x = 0–3 at %) annealed at various temperatures is considered. The dependences of coercive force H_cI and residual induction B_r on the copper content are found to be nonmonotonic. This fact is explained by that alloying with copper leads to a change in the phase composition, which is accompanied by an increase in the coercive force and the residual magnetization of the alloy, while a change in the chemical composition and the thickness of intergranular interlayers upon copper alloying leads to a decrease in the values of H_cI and B_r as the copper content increases.