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We have observed a super-giant (~10,000,000%) negative magnetoresistance at39 mT field in Cu nanowires contacted with Au contact pads. In these nanowires,potential barriers form at the two Cu/Au interfaces because of Cu oxidationthat results in an ultrathin copper oxide layer forming between Cu and Au.Current flows when electrons tunnel through, and/or thermionically emit over,these barriers. A magnetic field applied transverse to the direction of currentflow along the wire deflects electrons toward one edge of the wire because ofthe Lorentz force, causing electron accumulation at that edge and depletion atthe other. This lowers the potential barrier at the accumulated edge and raisesit at the depleted edge, causing a super-giant magnetoresistance at roomtemperature.

nanotechnology

Super-giant magnetoresistance at room-temperature in copper nanowires  due to magnetic field modulation of potential barrier heights at  nanowire-contact interfaces