Microwave power generation by magnetic superlattices

Samuel Littlejohn, Alain Nogaret, Steven R Davies, M Henini, H E Beere, D A Ritchie

OAI: oai:purehost.bath.ac.uk:publications/9c41ae8e-c272-46a1-b727-c6d35e9ce39f • DOI: https://doi.org/10.1063/1.3670400

We report on microwave power emission by ballistic electrons as they cross a region of spatially inhomogeneous magnetic field. Magnetic finger gates were fabricated at the surface of high mobility GaAs/AlGaAs Hall bars embedded in a coplanar waveguide. By modulating the current injected through the Hall bar and measuring the second harmonic of the signal rectified by a Schottky detector, we obtain the microwave power emitted by the superlattice. This power (~6W.m-2) is compared to the fluorescence of electron spins that undergo spin resonance as they cross domains of opposite magnetic field.