In granular NiFe-SiO_2 films which display giant Hall effect, extraordinary Hall resistivity rho _xys,normal Hall resistivity rho _xys, and magnetoresistivity DELTA rho , were all found to follow power law dependencieson resistivity rho . Namely,- rho ~0.81,- rho _xys approx rho ~0.64 and - DELTA rho approx rho ~1.15. We propose that the presence of nanometer sized particles in the percolating conduction channels gives rise to the giant enhancement for both ordinary and extraordinary Hall effect in magnetic metal-insulator nanocomposite films. THis physical picture describes qualitatively well the general featurers of GHE, and its correlation with resistivity and magnetoresistivity.
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