Magnetic properties and reverse magnetization process of anisotropic nanocomposite permanent magnet

Abstract

Abstract The effects of microstructure parameter upon the magnetic properties of anisotropic nanocomposite permanent magnet (ANPM) Pr2Fe14B/α-Fe were investigated by Micromagnetic finite-element method. The results show that soft magnetic phase filling in the intergranular layer between the hard magnetic phase grains is more favorable for obtaining excellent ANPM Pr2Fe14B/α-Fe. The maximum energy product ((BH)max) of ANPM Pr2Fe14B/α-Fe can reach 762 kJ/m3 for the ideally oriented magnet with the mean grain size of 5 nm and the intergranular layer thickness of 2 nm. The larger (BH)max mainly derives from the contribution of higher remanence which is ascribed to the intergranular exchange coupling between soft and hard magnetic phase. In addition, the reverse magnetization process of ANPM Pr2Fe14B/α-Fe has been studied. It is found that the magnetic moments coherently reverse in reversal magnetization process for ANPM Pr2Fe14B/α-Fe. The study takes the specific composition Pr2Fe14B/α-Fe as an example, however, the results about reasonable microstructure and demagnetization mechanism are still applicable to ANPM with other different hard and soft magnetic phase materials.