Structural and magnetic properties of Nd_3(Fe_(1-x)Al_x)_(27.5)Ti_(1.5) (x=0.1-0.4)

摘要

The structural and magnetic properties of Nd_3(Fe_(1-x)Al_x)_(27.5)Ti_(1.5) (x=0.1-0.4) were investigated by x-ray diffraction, magnetization, and Curie temperature (T_C) measurements. The unit cell volume increases with the Al substitution, in accordance with the larger atomic radius of Al. The saturation magnetization and the Curie temperature decrease with increasing Al content, and the decrease is attributed to the modification of the density of states of 3d band due to the 3p band of Al and to the magnetic dilution effect. The easy direction of magnetization is along the b axis for x=0.4. The anisotropy field (H_A) decreases with increasing Al concentration.