Effect of surface scattering on the extraordinary Hall coefficient in ferromagnetic films

The effect of surface scattering on the extraordinary Hall coefficient has been studied in thin films of nickel and granular Ni-SiO2 mixtures. The surface, scattering contributions to the Hall coefficient and longitudinal resistivity have been extracted from the respective total values. The temperature-independent linear relation between the two parameters has been found. Different scattering mechanisms need to be separated, and the applicability of the existing models for heterogeneous systems with spatially extended scattering centers should be reexamined.