Hall effect of asymmetric La 0.7Sr 0.3MnO 3/SrTiO 3/SrRuO 3 and La 0.7Sr 0.3MnO 3/BaTiO 3/SrRuO 3 superlattices

The Hall resistivity and magnetization of high quality asymmetric La 0.7Sr 0.3MnO 3/SrTiO 3/SrRuO 3 and La 0.7Sr 0.3MnO 3/BaTiO 3/SrRuO 3 superlattices were investigated. The Hall resistivity hysteresis curves have a complex magnetic field dependence in an intermediate temperature regime that is not reflected in the global magnetization. We interpret this as arising either from the formation of complex magnetization textures that lead to the appearance of a topological Hall effect or from the shift of the Weyl nodes in SrRuO 3 by the coupling to the adjacent La 0.7Sr 0.3MnO 3 magnetization.