The hard magnetic properties of nanocomposite Nd3:6Pr5:4Fe83Co3B5 ribbons prepared by melt spinning

Nanocomposite Nd3:6Pr5:4Fe83Co3B5 ribbons were prepared by direct melt spinning at different wheel speeds. The hysteresis loop of the ribbons prepared at wheel speed V D 20 m=s shows a single hard magnetic behavior with high coercivity. The values of remanence Mr D 11:3 kG s, intrinsic coercivity iHc D 6:0 kOe and energy product.BH/max D 17:2 MG Oe are obtained at room temperature. Transmission electron microscopy and magnetic force microscopy have been employed to image the microstructure and magnetic domains in the ribbons. Due to the unnegligible inter-grain exchange coupling, interaction domains are observed. The shape of the demagnetization curve in the second quadrant at different temperature gives more information about inter-grain exchange coupling. The coercivity mechanis