Magnetostriction and magnetic anisotropy in TbFe11TiHX (x=0, 1) single crystals

Single crystals of TbFe11Ti and its hydride with tetragonal ThMn12-type structure were obtained. Magnetostriction measurements have been made on TbFe11TiHX (x=0, 1) single crystals by the applied strain gauge method in the temperature range from 77 to 400 K and in magnetic fields up to 13 kOe. Magnetization measurement along the main crystallographic directions of the tetragonal structure have been performed on RFe11TiHx (x=0, 1) single crystals in applied high magnetic fields up to 120 kOe in the temperature range from 4.2 to 300 K. It was concluded that hydrogenation results in an increase in rare-earth anisotropy that leads to the disappearance of the spin-reorientation transition in the TbFe11TiH single crystal. Hydrogenation lead to a change in sign of the magnetic anisotropy constant K3 and the magnetostriction constant λ2α,2.