Hall Effect of (Co _0.34 Fe _0.66 ) _0.42 (SiO ₂ ) _0.58 Granular Films

Abstract

The (Co0.34Fe0.66)0.42(SiO2)0.58 (volume fraction) granular films were fabricated by using the magnetron sputtering technique, and a saturated Hall resistivity ρxys of about 29 µΩ·cm was observed at room temperature, which was almost three orders of magnitude greater than that in the pure ferromagnetic sample. The measured linear dependence of resistivity ρxx versus log10T and magnetoresistance effect indicated that the the Co0.34Fe0.66 volume fraction in the films was near percolation threshold. The giant Hall effect in the (Co0.34Fe0.66)0.42(SiO2)0.58 granular film may originate from the percolation phenomenon.