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.
|ジャーナル||Physica E: Low-Dimensional Systems and Nanostructures|
|出版ステータス||Published - 2004 4|
|イベント||15th International Conference on ELectronic Propreties - Nara, Japan|
継続期間: 2003 7 14 → 2003 7 18
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