Structure and magnetic properties of Y(Fe 1− xMn x) 12 compounds and their nitrides ( x = 0.2 and 0.4)

Abstract

The structural and magnetic properties of Y(Fe 1− x Mn x ) 12 compounds and their nitrides ( x = 0.2 and 0.4) have been studied by using X-ray diffraction and magnetic measurements. It is found that the lattice parameters increase, while the saturation magnetization and Curie temperature decrease with Mn content increment in Y(Fe 1− x Mn x ) 12 compounds. Y(Fe 0.8Mn 0.2) 12 compound shows a weak easy- c axis magnetization direction, but Y(Fe 0.6Mn 0.4) 12 compound is in a paramagnetic state at room temperature. Upon nitrogenation, the lattice parameters, Curie temperature are notably increased and the saturation magnetization is greatly increased by about 50%. The easy magnetization direction for both compound nitrides all lies in the basal plane at room temperature.