Effect of a Domain Wall on the Conductance Quantization in a Ferromagnetic Nanowire

Details Effect of a Domain Wall on the Conductance Quantization in a Ferromagnetic Nanowire Effect of a Domain Wall on the Conductance Quantization in a Ferromagnetic Nanowire

1999-12-25

arxiv.org/abs/cond-mat/9912447v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures, Corrected typos and added references

Scientific paper

10.1103/PhysRevB.61.11278

The effect of the domain wall (DW) on the conductance in a ballistic ferromagnetic nanowire (FMNW) is revisited by exploiting a specific perturbation theory which is effective for a thin DW; the thinness is often the case in currently interested conductance measurements on FMNWs. Including the Hund coupling between carrier spins and local spins in a DW, the conductance of a FMNW in the presence of a very thin DW is calculated within the Landauer-B\"{u}ttiker formalism. It is revealed that the conductance plateaus are modified significantly, and the switching of the quantization unit from $e^2/h$ to ``about $2e^2/h$'' is produced in a FMNW by the introduction of a thin DW. This accounts well for recent observations in a FMNW.

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