Hall Effect of (Co_0.34Fe_0.66)_0.42(SiO₂)_0.58 Granular Films

The (Co_0.34Fe_0.66)_0.42(SiO₂)_0.58 (volume fraction) granular films were fabricated by using magnetron sputtering technique, and a saturated Hall resistivity ρ_xys of about 29μΩ.cm was observed at room temperature, which was almost 3 orders of magnitude greater than that in the pure ferromagnetic sample. The measured linear dependence of resistivity ρ_xx vs log₁₀T and magnetoresistance effect indicated that the Co_0.34Fe_0.66 volume fraction in the films were near percolation threshold. The giant Hall effect in (Co_0.34Fe_0.66)_0.42(SiO₂)_0.58 granular film may originate from percolation phenomenon.