Micromagnetic study for magnetic properties of exchange coupled nanocomposite magnetic systems with Nd_2Fe_(14)B grains embedded in α-Fe matrix

摘要

Developing high efficiency rare earth alloy magnets at low cost is an economically hopeful way to expand their application area. In this study, magnetic properties of nanocomposite isotropic exchange coupled systems with the structure of Nd_2Fe_(14)B crystalline grains embedded in α-Fe matrices have been simulated by micromagnetic finite element method (FEM). The results have been analyzed by means of the effect of volume fraction of nanosized exchange coupling area between the magnetically hard Nd_2Fe_(14)B and soft α-Fe phase on magnetic properties of the exchange coupled Nd_2Fe_(14)B/α-Fe magnetic systems. The results show that the magnetic systems with the structure of Nd_2Fe_(14)B grains embedded in α-Fe matrices can have comparatively advanced magnetic properties with small amount of Nd_2Fe_(14)B components, because of efficient inter-phase exchange coupling between magnetically hard Nd_2Fe_(14)B grains and soft α-Fe matrix.