Abstract
Magnetic and crystallographic measurements have been made on new pseudoternary compounds Nd 2 (Fe 1-x Cu x ) 14 B in order to study the systematic variation of magnetic properties with Cu substitution. X-ray powder diffraction data indicate that the tetragonal Nd 2 Fe 14 B-type phase exists only for x≤0.05. Partial replacement of Fe by nonmagnetic Cu significantly decreases the saturation magnetization value with little change in ferromagnetic Curie temperature T C . Low-temperature spin orientation temperature (T sr ) decreases from 135 K for x=0.00 to 130 K for x=0.03, and 122 K for x=0.05, and the tilt angle of the easy magnetization direction from the tetragonal c axis decreases accordingly.