Granular magnetoresistance in cobalt/poly „3-hexylthiophene, 2, 5-diyl... hybrid thin films prepared by a wet chemical method

Cobalt/poly 3-hexylthiophene, 2, 5-diyl P3HT hybrid thin films were prepared by a wet chemical method. Their microstructure consists of a nanoscale mixture of a crystalline P3HT matrix, interspersed with amorphous P3HT regions containing the cobalt nanoparticles. Magnetic and transport measurements are consistent with this microstructure and the temperature dependence of the resistance of these hybrid systems is well-fitted R2=0.9993 to the fluctuation induced tunneling model. Moreover, by applying a magnetic field, a magnetoresistance ratio of 3% was observed in 17 vol % Co hybrid films at 10 K. © 2009 American Institute of Physics. DOI: 10.1063/1.3213561