Magnetic properties and microstructure of the dual-phase nanocomposite magnet Sm3(Fe,Ti)29N x/α-Fe

A new dual-phase nanocomposite magnet, made up of the well-coupled Sm3(Fe,Ti)29N x and α-Fe nano-crystals, has been successfully fabricated by the melt-spun technique. Measurements of magnetic properties reveal that the hysteresis loop shows up the notable characteristics of single hard magnet in the well-crystallized samples. The electron microscopy investigations indicate that the grain sizes in our samples in general range from 30 to 60 nm for Sm3(Fe,Ti)29N x and from 10 to 20 nm for α-Fe, grain boundaries between the Sm3(Fe,Ti)29N x and α-Fe phases are clean without any impurities. These structural features are fundamentally compatible with direct exchange-coupling between these two magnetic phases