Structural and magnetic studies of 1% Ho:Gd _0.99−x Lu _x alloys

Abstract

We present a study of the magnetic and structural properties of 1% Ho:Gd 0.99-x Lu x alloys. X-ray diffraction patterns for 1% Ho:Gd 0.99-x Lu x (x = 0.01, 0.39, and 0.59) show a single hexagonal type phase structure and the lattice parameters are found to depend on the Lutetium concentration. Magnetic measurements were made at temperatures between 100 K and 850 K using a vibrating sample magnetometer with a maximum field of 13.5 kOe. All the samples under investigation show a ferromagnetic behavior up to Curie temperature. The Curie temperature (T c ) and the saturation magnetization (M s ) are found to decrease with increasing the Lutetium concentration. The saturation magnetization is found to increase with decreasing the temperature (T) for all samples. The magnetic moment of 1% Ho:Gd 0.98 Lu 0.01 at 0 K was estimated, to be (7.05 ± 0.05) µ B /f.u., by extrapolating the M s versus T 3/2 to T = 0 K. The results clearly indicate the formation of solid solution alloys.

Structural and magnetic studies of 1% Ho:Gd0.99−xLax alloys

“…This study added a new detail to the phase diagram and revealed the existence of Ferro-I in addition to helical antiferromagnetic and canted ferromagnetic phases. Recently, we studied the magnetic and structural properties of Gd 0.99Àx Lu x Ho 0.01 and found that these alloys have single hexagonal type phase structure and the lattice parameters are found to depend on the Lutetium concentration [11]. We also found that the Curie temperature and the saturation magnetization decrease with increasing Lutetium concentration.…”

“…This study is part of a project on rare earth alloys using different techniques such as XRD, VSM, FMS and NMR [3,11].…”