Resistivity due to a Domain Wall in Ferromagnetic Metal

Physics – Condensed Matter – Mesoscale and Nanoscale Physics

Scientific paper

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9 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.78.3773

The resistivity due to a domain wall in ferromagnetic metallic wire is calculated based on the linear response theory. The interaction between conduction electrons and the wall is expressed in terms of a classical gauge field which is introduced by the local gauge transformation in the electron spin space. It is shown that the wall contributes to the decoherence of electrons and that this quantum correction can dominate over the Boltzmann resisitivity, leading to a decrease of resisitivity by nucleation of a wall. The conductance fluctuation due to the motion of the wall is also investigated. The results are compared with recent experiments.

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