Anomalous magnetoresistance by dephasing in a disordered layer with ferromagnetic boundary

The dephasing effect of the electron by boundary magnetic field is investig ated theoretically in a multilayer structure of a nonmagnetic conduction la yer sandwiched by ferromagnetic layers. The induced moment at the interface is shown to cause dephasing if a spin mixing mechanism such as spin-orbit interaction is present. This effect suppresses the anti-localization due to the spin-orbit interaction anti is stronger when the magnetization of the two layers are parallel to each other, contributing to an anomalous positiv e magnetoresistance close to a switching field at low temperatures.