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Co‐tunneling Enhancement of the Electrical Response of Nanoparticle Networks
Author(s) -
Pauly Matthias,
Dayen JeanFrançois,
Golubev Dimitry,
Beaufrand JeanBaptiste,
Pichon Benoit P.,
Doudin Bernard,
BéginColin Sylvie
Publication year - 2012
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201100931
Subject(s) - quantum tunnelling , materials science , conductance , nanoparticle , magnetoresistance , spintronics , nanotechnology , scaling , planar , condensed matter physics , charge (physics) , optoelectronics , ferromagnetism , physics , magnetic field , computer science , geometry , mathematics , computer graphics (images) , quantum mechanics
A co‐tunneling charge‐transfer process dominates the electrical properties of a nanometer‐sized “slice” in a nanoparticle network, which results in universal scaling of the conductance with temperature and bias voltage, as well as enhanced spintronics properties. By designing two large (10 μm) electrodes with short (60 nm) separation, access is obtained to transport dominated by charge transfer involving “nanoslices” made of three nanoparticles only. Magnetic iron oxide nanoparticle networks exhibit a magnetoresistance ratio that is not reachable by tunneling or hopping processes, thereby illustrating how such a size‐matched planar device with dominant co‐tunneling charge‐transfer process is optimal for realizing multifunctional devices with enhanced change of conductance under external stimulus.