Preparation and Magnetic Properties of Anisotropic SmCo5/Co Composite Particles

摘要

Anisotropic SmCo_5/Co nanocomposite powders have been prepared by electroless Co deposition on commercial SmCo_5 powders with hydrazine as reducer. The Co particles are mainly in the range of 8–27 nm and form dense/continuous soft magnetic coatings on the surface of SmCo_5 powders. Exchange coupling happened between the coated Co soft magnetic particles and the SmCo_5 hard phase. As a result, SmCo_5/Co nanocomposite powders with remanence of73.58 emu/g and energy product of 13.74 MGOe were obtained in the optimum condition, as compared with those of70.52 emu/g and 13.40 MGOe for uncoated SmCo_5 powders. The effects of Co adding amount on Co particle size, coating morphology, and magnetic properties of SmCo_5/Co products were investigated.