Numerical studies of transport properties through point contacts of magnetic metals

Kyu Ueno, Mikio Eto

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


We theoretically study the electric transport through atomic-size point contacts of magnetic metals. The conductance in spin-polarized states is examined using Green's function method, considering the electron-electron interaction within the unrestricted Hartree-Fock approximation (Stoner magnetization). In a single band model, the conductance quantization is observed in units of e2/h per spin direction. In a two-band model, in which broad and narrow bands coexist at the Fermi level, the conductance is considerably suppressed by the interband scattering around the point contact when electrons are spin-polarized in one direction in the whole system. When the spin polarization on one side of the contact is anti-parallel to that on the other side, the interband scattering is not relevant and the conductance is quantized. This is in accordance with experimental results using Ni break-junctions.

Original languageEnglish
Pages (from-to)276-279
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Issue number1-3
Publication statusPublished - 2004 Apr
Event15th International Conference on ELectronic Propreties - Nara, Japan
Duration: 2003 Jul 142003 Jul 18


  • Break junction
  • Conductance quantization
  • Point contact
  • Stoner magnetization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics


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