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

Abstract

• Proper Ti content can refine the microstructure and improve the exchange coupling interaction, leading to enhance the magnetic properties . • The optimum ( BH ) max (16.24 MGOe) is obtained with the Ti addition at x = 0.4. • The magnetization reversal behaviors were investigated by analyzing the recoil loops and the FORC diagrams. In the present work, the (Nd 0.8 Ce 0.2 ) 2 Fe 12 Co 2−x Ti x B (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 H cj of 7.13 kOe and maximum energy product ( BH ) max of 16.24 MGOe with a slight decrease in B r 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.