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Reproducible high-temperature superconducting multilayer flux transformers were fabricated using chemical mechanical polishing. The measured magnetic field noise of the flip-chip magnetometer based on one such flux transformer with a 9 Â 9 mm 2 pickup loop coupled to a bicrystal dc SQUID was 15 fT/Hz 1/2 above 2 kHz. We present an investigation of excess 1/f noise observed at low frequencies and its relationship with the microstructure of the interlayer connections within the flux transformer.doi:10.1063/1.4738782 fatcat:ecdnv64qcnd23gar6thfldatba