Magnetic properties of R₂Co_17-xGa_x and RCo_5-xGa_x alloys (R = Y, Tb) in high magnetic fields

Chem. Met. Alloys 1 (2008) 111-114

https://doi.org/10.30970/cma1.0038

W. SUSKI, N. VITYK, R. GLADYSHEVSKII, A. GILEWSKI, T. MYDLARZ, K. WOCHOWSKI

Magnetic properties of R₂Co_17-xGa_x and RCo_5-xGa_x alloys, where R = Y and Tb, have been investigated in steady and pulsed magnetic fields up to 14 and 34 T, respectively. For the Y₂Co_17-xGa_x alloys saturation is reached in relatively low magnetic fields and the saturation magnetic moment decreases with increasing Ga content. No saturation was observed for the YCo_5-xGa_x alloys and the Curie temperatures were lower than for the corresponding 2:17 phases. The Curie temperatures of the TbCo_5-xGa_x samples were also lower than for the corresponding 2:17 materials. The Tb compounds did not reach saturation even in the highest magnetic field. The minimum in the temperature dependence of the magnetization is an indication of ferrimagnetic character. The substitution of Ga for Co in TbCo_5-xGa_x increases the magnetic moment, which may be explained as a result of the replacement of Co atoms with magnetic moments antiparallel to those of the Tb atoms.

Magnetic moment of Y₂Co_17-xGa_x and YCo_5-yGa_y vs. pulsed magnetic field at 4.2 K. The solid lines are for the former alloys and the dashed lines for the latter ones.

Keywords

Rare-earth alloys and compounds / Magnetic measurements / Magnetization