Abstract
We have studied oscillatory magnetoresistance (Weiss oscillation) in a two-dimensional electron gas (2DEG) subjected to a one-dimensional periodic modulation of both electric and magnetic fields. The relative amplitude of the two types of modulation can be controlled by applying a bias voltage to a gate consisting of a periodic array of ferromagnetic metal stripes. Allowing the magnetic modulation to dominate by applying +500 mV to the gate, we succeeded in observing magnetic Weiss oscillation which is characterized by peak/valley inversion in the magnetoresistance oscillation and not with regard to its well-known electric counterpart. The oscillation curve shows continuous phase shift with smaller gate biases, until it reaches the peak/valley location of electric Weiss oscillation at about −250 mV.
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