Microwave power generation by magnetic superlattices

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

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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.
Original languageEnglish
Article number242107
Number of pages3
JournalApplied Physics Letters
Issue number24
Publication statusPublished - 12 Dec 2011


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