Resistance resonance effects through magnetic edge states

We report on the magnetoresistance of a two-dimensional electron gas subjected to an abrupt magnetic field gradient arising from a ferromagnetic stripe fabricated at its surface. A sharp resistance resonance effect is observed at B-p due to the formation of two types of magnetic edge states that drift in opposite directions perpendicular to the magnetic field gradient for B < B-p and B > B-p. A semiclassical drift-diffusion model gives a good description of the effects of the magnetic confinement on both the diagonal and off-diagonal components of the resistivity tensor.