A radio-frequency high-temperature superconducting magnetometer is described. It is based on the generation of combination frequencies in a nonlinear ceramic-superconductor sensor with a resonance circuit at its input. Measurements at the combination frequency allows for an improvement of the noise and frequency characteristics as compared to a magnetometer based on the generation of the second harmonic in the superconductor. The instrument has a level of intrinsic noise of (2-4) ×10{sup}(-8) Oe/Hz{sup}(1/2) within a frequency range of 17 kHz.
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