Abstract
Coherent microwave radiation has been directly detected from superconducting Nb films in the frequency range up to 600 MHz. The mixed state in the films has been influenced by a superposition of two alternating magnetic fields directed perpendicular to film surface. First of them, which slowly varies in time, sets up a vortex structure in the film, while the second high-frequency electromagnetic field provides a synchronization of Abrikosov vortex motion. The simultaneous action of the fields results in either the amplification or generation of electromagnetic radiation. Harmonic mixing of the radiation is also detected.
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