Transport in Magnetic Nanoparticles Super-Lattices : Coulomb Blockade, Hysteresis and Magnetic Field Induced Switching

Abstract

We report on magnetotransport measurements on millimetric super-lattices of Co-Fe nanoparticles surrounded by an organic layer. At low temperature, the transition between the Coulomb blockade and the conductive regime becomes abrupt and hysteretic. The transition between both regime can be induced by a magnetic field, leading to a novel mechanism of magnetoresistance. Between 1.8 and 10 K, high-field magnetoresistance due to magnetic disorder at the surface of the particles is also observed. Below 1.8 K, this magnetoresistance abruptly collapses and a low-field magnetoresistance is observed.

arXiv comment9 pages (text, figures, figures legends and references). 3 figures reference 33 added : "arXiv:0710.1750v1"

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Cited by in corpus (4)

• Magnetoresistance and collective Coulomb blockade in super-lattices of ferromagnetic CoFe nanoparticles
• 3000 % high-field magnetoresistance in super-lattices of CoFe nanoparticles
• Voltage and Temperature Dependence of High-Field Magnetoresistance in Arrays of Magnetic Nanoparticles
• High-field and low field magnetoresistance of CoFe nanoparticles elaborated by organometallic chemistry