Magnetotransport Properties of ${\hbox {Y}}_{2}{\hbox {Fe}}_{17-{{x}}}{\hbox {Co}}_{{x}}$ Single Crystals

We find a large Hall effect anisotropy in Y₂Fe_17-xCo_x single crystals with x les 2. The anomalous Hall effect resistivity rho_xy , obtained with an applied magnetic field H perpendicular to the c-axis, is almost one order of magnitude larger than the one for a magnetic field along c-axis (hard magnetization direction). rho_xy peaks close to the Curie temperature for both orientations. The variation of rho_xy with the longitudinal resistivity, in the zero magnetic field limit, shows that skew scattering dominates Hall resistivity for Hperpc whereas intrinsic Hall effect is important for H||c. This likely arises from a large planar anisotropy shown by these alloys.