Abstract
Magnetocrystalline anisotropy and spin-reorientation transitions (SRT) of the ErFe 11− x Co x TiH y ( x = 0 , 2, 4; y = 0 , 1) compounds with the ThMn 12-type structure were studied. The investigation of ErFe 11− x Co x TiH y compounds with x ≤ 2 show an “easy axis” anisotropy at room temperature and an “easy cone” anisotropy at temperatures below the spin-reorientation temperature ( T SR ). The ErFe 7Co 4Ti with x = 4 below the SRT exhibits an “easy plane” anisotropy with the easy direction oriented along the [1 0 0] axis. Hydrogen insertion into ErFe 9Co 2Ti leads to an increase of T SR whereas hydrogenation of ErFe 7Co 4Ti causes T SR decreasing down to 40 K and essential change of SRT character. ErFe 7Co 4TiH hydride has an “easy cone” anisotropy below T SR . It was found that the replacement of the Fe by Co and hydrogen insertion into the crystal lattice of Er(Fe,Co) 11Ti compounds has an opposite influence on the SRT temperature.
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