Abstract
The magnetic anisotropy of the DyFe11Ti intermetallic has been studied by measuring the angular dependence of the components of the magnetization parallel and perpendicular to the applied magnetic field. The measurements were performed on two plate-shaped samples with the surfaces parallel to the (110) and (001) planes, respectively. From the measurements in the (110) plane the thermal dependence of the spin reorientation angle has been obtained. The magnetic field dependence of M/sub /// and Mperpendicular to showed a first-order magnetization process (FOMP). A single-ion model for the crystal-electric-field interaction and a mean-field model for the exchange interaction have been used to explain theoretically the experimental results. An in-depth study of the character of the spin reorientation transition from easy cone to easy plane has been undertaken. From our study we show that for temperatures near this spin reorientation temperature, two magnetic phases (planar and conical phases) coexist in the sample, giving rise to an average angle that evolves continuously with temperature. A similar behaviour has been also observed for magnetic fields near the critical field of the FOMP, producing a continuous change of the magnetization instead of a jump at the critical field.
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