Giant Hall effect of Fe-45.51(Al2O3)(54.49) nano-granular film

A series of Fe-45.51 (Al2O3)(54.49) nano-granular films were prepared using ion-beam sputtering technique. A saturated hall resistivity of about 12.5 mu Omega.cm at room temperature was observed. The transmission electron mic roscopy image showed that very small Fe particles of smaller than 1 nm are embedded in Al2O3 matrix, and connected into network. The measured rho - T curve indicated that this giant Hall effect may originate from the percolat ion phenomenon. With different annealing temperature (T-A) up to 300 degree s C, the saturated Hall resistivity decreased only a little. The good therm al stability of Fe-45.51 (Al-2 O-3)(54.49) nano-granular Films showed poten tial application for magnetic sensor.