Giant magnetoresistance in an electrochemically synthesized regimented array of nickel quantum dots |
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Affiliation: | Department of Chemical Engineering, Department of Electrical Engineering, University of Notre Dame, Notre Dame, Indiana 46556, U.S.A. |
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Abstract: | Giant magnetoresistance (GMR) due toremotespin dependent scattering of electrons has been observed in an electrochemically synthesized structure consisting of a two-dimensional, quasi-periodic array of nickel dots (diameter ∼100 Å) overlayed with a thin copper layer. Current flows exclusively in the copper layer, but the electrons scatter from the magnetic moments on the remote, underlying nickel quantum dots. Since the scattering cross-section depends on the magnetization of the dots, the resistance of the structure can be altered with a magnetic field which then gives rise to the GMR. The magnetoresistance is about 3% of the zero-field resistance up to a magnetic flux density of 2 tesla at room temperature. |
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