Effects of domain wall and pinning center on electron transport in ferromagnetic wire

The effects of the domain wall and its pinning center on the electron conduction are studied in a framework of the random phase approximation. We show that the domain wall enhances the resistance due to the spin fluctuation around it. Furthermore, the pinning center plays an important role of suppression of the spin fluctuation, which leads to the reduction of the resistance when the domain wall locates at the pinning center. The results obtained are consistent with the experimental findings