Abstract
The extraordinary Hall effect in Fe-Pt thin films prepared by the ion-beam sputtering method was investigated. The Hall resistivity ρH at room temperature of disordered samples was larger than that of ordered samples in the composition range of 40 - 80 at% Pt. Disordered polycrystal line samples show a maximum ρH value of 3.6 μΩ·cm at a composition of around 60 at % Pt. The influence of the film thickness d on the Hall effect was also investigated. The Hall voltage VH increases with decreasing d, and a VH value of more than 100 mV was obtained at d = 25 Å. The saturation field Hk of the perpendicular magnetization decreases with decreasing d, which is considered to be attributable to the surface anisotropy.
