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Effect of Co and W additions on the structure and magnetic properties of Nd2Fe14B/-Fe nanocomposite magnets

The effect of Co addition combined with W on the microstructure and magnetic properties of nanocomposite magnets with composition of (1-x wt%)Nd8.55 Fe84.49 W0.60 B0.636 +x wt% Co, prepared by mechanical alloying, has been investigated. The addition of W can increase the unit cell volume of soft and hard phases in nanocomposite magnets, and cause the anisotropy field of the hard phase component to increase. Therefore, the addition of W can improve coercivity. On the other hand, addition of Co leads to a decrease of the grain size of the -Fe soft phase component in nanocomposite magnets annealed at temperatures lower than 670 °C. It leads further to a decrease of the optimal annealing temperatures, an increase of the remanence and maximum magnetic energy product, and a slight decrease of the coercivity. With increasing the content of Co, the dependence of remanence Jr on annealing temperature Ta changes from a convex shape, giving a maximum, to a monotonically decreasing one. These phenomena have been explained in terms of the variation of grain growth and exchange coupling between the grains, due to the addition of Co and W.