I-V asymmetry and magnetoresistance in nickel nanoconstrictions

I-V asymmetry and magnetoresistance in nickel nanoconstrictions

We present a joint experimental and theoretical study on the transport properties of nickel nanoconstrictions. The samples show highly non-linear and asymmetric I-V characteristics when the conductance is smaller than G(0) = 2e(2)/h, and huge magneto resistance ratios exceeding 99.9%. We model a sin...

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Bibliographic Details
Main Authors: Cespedes, O, Rocha, A, Lioret, S, Viret, M, Dennis, C, Gregg, J, van Dijken, S, Sanvito, S, Coey, J
Format: Conference item
Published: 2004
Description
Summary:We present a joint experimental and theoretical study on the transport properties of nickel nanoconstrictions. The samples show highly non-linear and asymmetric I-V characteristics when the conductance is smaller than G(0) = 2e(2)/h, and huge magneto resistance ratios exceeding 99.9%. We model a single point contact in a two-band tight-binding model as a 2 x 2 nickel chain connected to two semi-infinite nickel leads. The magnetoresistance is calculated by using a non-equilibrium Green's function technique. (C) 2003 Published by Elsevier B.V.

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