Fabrication and Magnetic Properties of $\text{Nd}_2\text{Fe}_{14}\text{B/Fe}_{65}\text{Co}_{35}$ Hard Magnetic Ribbons

Abstract

Nd$_2$Fe$_{14}$B/Fe$_{65}$Co$_{35}$ hard magnetic ribbons were fabricated by melt-spinning technique using Nd$_{16}$Fe$_{76}$B$_{8 }$ and Fe$_{65}$Co$_{35}$ pre-alloys as starting materials. The results showed that the formation of the interactive hard/soft nanocomposite with the homogeneous distribution of the Fe-Co phase throughout the Nd$_{2}$Fe$_{14}$B matrix provided the Curie temperature ($T_{c})$ as high as 747 K, the magnetic remanence (B$_{r}$) of 8.88 kG and the maximum energy product, (BH)$_{\max}$, of 16.75 MG.Oe for the fabricated Nd$_{2}$Fe$_{14}$B/Fe$_{65}$Co$_{35}$ ribbons at the optimal speed of 25 m/s. In addition, the intrinsic coercivity ($_{i}$H$_{c}$) of 9.27 kOe and remanence coercivity ($_{b}$H$_{c}$) of 6.94 kOe were found for these ribbons. The roles of the soft Fe$_{65}$Co$_{35}$ phase in the increasing of $T_{c}$, $B_{r}$ as well as in the (00l) preferred crystallographic orientation of hard magnetic grains on the free surface side of the fabricated ribbons were also discussed.