Magnetic properties of R2Co17-xGax and RCo5-xGax alloys (R = Y, Tb) in high magnetic fields

 

Chem. Met. Alloys 1 (2008) 111-114

 

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

 

Magnetic properties of R2Co17-xGax and RCo5-xGax alloys, where R = Y and Tb, have been investigated in steady and pulsed magnetic fields up to 14 and 34 T, respectively. For the Y2Co17-xGax 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 YCo5-xGax alloys and the Curie temperatures were lower than for the corresponding 2:17 phases. The Curie temperatures of the TbCo5-xGax 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 TbCo5-xGax 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.

 

Подпись: m (mB/f.u.)Подпись: m (mB/f.u.)

Magnetic moment of Y2Co17-xGax and YCo5-yGay 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