Effect of Hydrogen on the Magnetocrystalline Anisotropy and Magnetic Phase Transitions of RFe_(11)Ti Single Crystals

摘要

A systematic investigation of the intrinsic magnetic properties of RFe_(11)TiH (x=0, 1) single crystal has been performed by means of torque and pendulum magnetometery techniques and high-field magnetization measurements. The magnetization and magnetic anisotropy fields of the iron sublattice are determined for the Y and Lu compounds. A complex temperature dependence of spin structure was observed for DyFe_(11)Ti, TbFe_(11)Ti, NdFe_(11)Ti and ErFe_(11)Ti. Marked changes of the main magnetic properties of the RFe_(11)Ti compounds are induced by hydrogen insertion. The analysis of the temperature dependence of the experimental torque curves for RFe_(11)Ti and RFe_(11)TiH_(1-δ ) single crystals were used to obtain magnetic phase diagrams. Among them the SmFe_(11)TiH_(1-δ ) compound seemed to be the most potentially useful candidate for high-quality permanent magnets.