Magnetization reversal behavior and first-order reversal curve diagrams in high-coercivity Zr-doped α-Fe/Nd2Fe14B nanocomposite alloys

• Published in: Rare metals 2021-05, Vol.40 (5), p.1232-1238
• Main Authors: Ji, Tian-Chi, Pan, Min-Xiang, Ge, Hong-Liang, Wu, Qiong, Zhang, Peng-Yue
• Format: Article
• Language: English
• Subjects: Biomaterials; Chemistry and Materials Science; Coercivity; Energy; Iron; Magnetic properties; Magnetism; Magnetization reversal; Materials Engineering; Materials Science; Melt spinning; Metallic Materials; Nanoalloys; Nanocomposites; Nanoscale Science and Technology; Physical Chemistry; Recoil; Zirconium
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-020-01405-5

In the present work, the magnetization reversal behavior for the melt spinning (Nd 0.8 Ce 0.2 ) 2 Fe 12 Co 2− x Zr x B ( x  = 0, 0.5) permanent alloys with high coercivity was investigated by analyzing the hysteresis curves and the recoil loops. Compared to the Zr-free alloy, the Zr-doped sample obtains higher magnetic properties: coercivity of H cj  = 650.5 kA·m −1 , squareness of H k / H cj  = 0.76 and maximum energy product of ( BH ) max  = 131.0 kJ·m −3 . The first-order reversal curves (FORCs) analysis was taken to identify optimal conditions of exchange coupling for the Zr-free and Zr-doped alloys. The coercivity mechanism of the α-Fe/Nd 2 Fe 14 B nanocomposite alloys was analyzed by the angular dependence of the coercive field as measured for the Zr-doped sample. The results show that the magnetic reverse process of the Zr-doped sample can be explained by the pinning model.