Study of the role of Ti doping on magnetic properties of some nanocomposite alloys of α-Fe/Nd2Fe14B type

In the present work, the (Nd0.8Ce0.2)2Fe12Co2−xTixB (x = 0-0.6) permanent alloys are prepared by melt-spinning method. Ti addition has proved to result in relevant improvements in the microstructure and magnetic properties. The enhanced coercivity Hcj of 7.13 kOe and maximum energy product (BH)max of 16.24 MGOe with a slight decrease in Br only have been obtained with the Ti content at x = 0.4. Microstructural observations reveal that the significant improvements of magnetic properties originate from the hard 2:14:1 magnetic phase refinement by introducing Ti element. The magnetization reversal behavior and energy loss characteristic have also been thoroughly investigated. The first-order reversal curves (FORCs) suggest that the Ti-doped sample with a higher maximum ρ of the major peak and the flat surface is responsible for the stronger inter-phase exchange coupling and better magnetic performance.