抄録
The dependence of the magnetic properties on the nanostructures of (Sm, Zr)Fe7Nx+α-Fe composite magnets have been investigated. As-quenched sample consists of TbCu7 type Sm-Fe phase (SmFe7 phase), amorphous phase and a-Fe phase. After heat treatment at 550°C for 1 h, amorphous phase turned into SmFe7 phase mainly. After nitrogenation, magnetic properties changed drastically with crystallization heat treatment temperature. These changes must be caused by phase transformations rather than change of nanostructures. Peak (BH)max value could be obtained by heat treatment at 700-800°C which are higher than crystallization temperature.
