Angular dependence of the Hall effect of La _0.8Sr _0.2MnO ₃ films

We find that the Hall effect resistivity (ρ _xy) of thin films of La _0.8Sr _0.2MnO ₃ varies as a function of the angle θ between the applied magnetic field and the film normal as ρ _xy=acosθ+bcos3θ, where |b| increases with increasing temperature and decreases with increasing magnetic field. We find that the angular dependence of the longitudinal resistivity and the magnetization cannot fully explain the surprising term b, suggesting it is a manifestation of an intrinsic transport property.