Effects of spin polarization on electron transport in modulation-doped Cd1−xMnxTe/Cd1−yMgyTe:I heterostructures

We examine and identify magnetoresistance mechanisms in 2D system containing a sizable concentration of magnetic ions. We argue that some of these mechanisms can serve as a tool to measure spin polarization. Lack of spin degeneracy and enhanced localization make it possible to detect an additional Quantum Hall Effect plateau associated with extended states floating-up in vanishing magnetic field.