3000 % high-field magnetoresistance in super-lattices of CoFe nanoparticles - Condensed Matter > Materials ScienceReport as inadecuate




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Abstract: We report on magnetotransport measurements on millimetre-large super-latticesof CoFe nanoparticles surrounded by an organic layer. Electrical properties aretypical of Coulomb blockade in three dimensional arrays of nanoparticles. Alarge high-field magnetoresistance, reaching up to 3000 %, is measured between1.8 and 10 K. This exceeds by two orders of magnitude magnetoresistance valuesgenerally measured in arrays of 3d metals ferromagnetic nanoparticles. Themagnetoresistance amplitude scales with the magnetic field - temperature ratioand displays an unusual exponential dependency with the applied voltage. Themagnetoresistance abruptly disappears below 1.8 K. We propose that themagnetoresistance is due to some individual paramagnetic moments localizedbetween the metallic core of the nanoparticles, the origin of which isdiscussed.



Author: Reasmey P. Tan, Julian Carrey, Marc Respaud, Celine Desvaux, Philippe Renaud, Bruno Chaudret

Source: https://arxiv.org/







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