Anomalous Hall Effect and Anisotropic Magnetoresistance in Perpendicularly Magnetized FePt_1-xPd_x Films

Abstract

  L1₀-ordered alloys with high uniaxial magnetic anisotropy (K_u) are key materials for future spintronic devices to realize large-scale integration. In this study, we investigated the anomalous Hall effect (AHE) and anisotropic magnetoresistance (AMR) effect for FePt_1-xPd_x (001) epitaxial films. Highly L1₀-ordered structures and perpendicular magnetization were obtained for all the compositions. The FePt film exhibited the highest K_u and the largest anomalous Hall angle (θ_AHE) among the present FePt_1-xPd_x samples, and the values of K_u and θ_AHE were gradually decreased as the Pd concentration increased. In addition, the composition dependence of the AMR ratio showed a similar tendency to those for K_u and AHE. We discuss possible scenarios to explain these composition dependencies.