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Harmonic and radio frequency generation in superconducting films by low-frequency magnetic field

Recently, an electromagnetic generation was detected from superconducting films caused by low-frequency oscillating magnetic fields. We propose a possible explanation of this interesting effect based on the nonlinear dependence of the magnetization curve of the superconducting film caused by the vortices motion in a film made from type II superconductors. Our calculations can explain the experimentally observed voltage spectral density and the generation of odd harmonics in it.