INFLUENCE OF HYDROGEN ON MAGNETOCRYSTALLINE ANISOTROPY OF TbFe₆Co₅Ti SINGLE CRYSTAL

Single crystals of TbFe11-xCoxTiHy (x = 5; y = 0, 1) with the tetragonal ThMn12-type structure were obtained. Magnetisation measurements along main crystallographic directions of TbFe6CO5TiHy (y = 0, 1) single crystals have been performed in the temperature range 5-340 K. It was established that TbFe6Co5Ti compounds show "easy axis" anisotropy in whole temperature range below Curie temperature (T-C). It was concluded that hydrogenation leads to an increase of magnetic anisotropy, and TbFe6CO5TiH hydride demonstrates "easy plane" anisotropy with the easy axis oriented along the [100] crystallographic direction. It was found that the replacement of the Fe by Co and hydrogen insertion into the crystal lattice of Tb(Fe,Co)(11) Ti compounds have an opposite influence on the magnetocrystalline anisotropy.