We compute the magnetoresistance of a step-potential model of an FeCr multilayer. We use a Boltzmann-equation method incorporating exact quantum-mechanical wave functions obtained by a transfer-matrix method. The only parameters required are the (spin-dependent) potentials and effective masses of the bulk materials, and the bulk and surface densities of point scatterers. Oscillatory magnetoresistances of the order of several percent are obtained without spin-dependent scattering, due to Fermi-surface necking effects.

• Received 24 May 1993

DOI:https://doi.org/10.1103/PhysRevB.48.6672