Abstract
We have studied the magnetoresistance oscillation (Weiss oscillation) in a two-dimensional electron gas (2DEG) subjected to a one-dimensional periodic modulation of magnetic field. Magnetic field modulation was produced by placing nickel grating on the surface of 2DEG wafer and applying a magnetic field B ‖ parallel to the 2DEG plane. We show that the amplitude of the magnetic modulation can be varied by rotating B ‖ with respect to the grating, independent of the perpendicular field B ⊥ used for the measurement of magnetoresistance. With decreasing magnetic modulation amplitude, the magnetoresistance oscillation loses its amplitude without shifting the phase, until peak-to-valley inversion takes place. This demonstrates that the magnetic modulation thus produced is spatially out-of-phase with the small residual electrostatic potential modulation inevitably brought about by the grating.
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