Araujo, M. A. N., Dugaev, V. K., Vieira, V. R., Berakdar, J., Barnas, J.

The transmission of correlated electrons through a domain wall in a ferromagnetic one-dimensional system is studied theoretically in the limit of a domain wall width smaller or comparable to the electron Fermi wavelength. The domain wall gives rise to both potential and spin-dependent scattering of the charge carriers. Using a ''poor man's`` renormalization group approach for the electron-electron interactions, we obtain the low temperature behavior of the reflection and transmission coefficients. The results show that the low-temperature conductance is governed by the electron correlations, which may suppress charge transport without suppressing spin current. The results may account for a huge magnetoresistance associated with a domain wall in ballistic nanocontacts.

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