I - V asymmetry and magnetoresistance in nickel nanoconstrictions

O. Céspedes*, A. R. Rocha, S. Lioret, M. Viret, C. Dennis, J. F. Gregg, S. van Dijken, S. Sanvito, J. M D Coey

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

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 = 2e2/h, and huge magnetoresistance ratios exceeding 99.9%. We model a single point contact in a two-band tight-binding model as a 2 × 2 nickel chain connected to two semi-infinite nickel leads. The magnetoresistance is calculated by using a non-equilibrium Green's function technique.

Original languageEnglish
Pages (from-to)1571-1572
Number of pages2
JournalJournal of Magnetism and Magnetic Materials
Volume272-276
Issue numberPart 2
DOIs
Publication statusPublished - May 2004
MoE publication typeA1 Journal article-refereed

Keywords

  • Ballistic magnetoresistance
  • Electron transport theory
  • Nickel nanocontact
  • Spin polarized transport

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