Abstract
We report on magnetotransport measurements on CoFe nanoparticles surrounded by an insulating organic layer. Samples were obtained by evaporating a solution of nanoparticles on a patterned substrate. Typical behavior of Coulomb blockade in array of nanoparticles is observed. High- and low-field magnetoresistances have been evidenced. Below 10K, a large high-field magnetoresistance is measured, reaching up to 500%. Its amplitude decreases strongly with increasing voltage. At 1.6K, this high-field magnetoresistance vanishes and an inverse low-field tunneling magnetoresistance is observed.
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