Abstract
We systematically study the magnetic properties, electron transport, and the anomalous Hall effect (AHE) in FexPt100-x solids over a wide composition range. These solids are characterized by strong spin-orbit interaction and enhanced magnetic moments from both elements. In our study, we vary the thickness and the composition of the thin films, the temperature of measurement, and the magnitude of the magnetic field in various directions. We have determined the Hall angle, the spin diffusion length, and the electron mean free path in this alloy system. The AHE is more than 3 orders of magnitude larger than the normal Hall effect, making FexPt100-x a good candidate for spintronic applications. The Hall angle determined in the FexPt100-x solids is comparable to that in pure Pt. From the analysis on the correlation between the AHE and electron transport, we find that the AHE is dominated by both the intrinsic Karplus-Luttinger (Berry phase) mechanism and the extrinsic side-jump mechanism.
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