Effects of Annealing Temperature on Amorphous Co₆₇Fe₃Cr₃B₁₂Si₁₅ Alloys for Flux-gate Magnetometers

The magnetic properties of amorphous alloy Co67Fe3Cr3B12Si15 samples, which were produced by the melt-spinning method and annealed at various temperatures, are analyzed. We found the best annealing temperature for Co67Fe3Cr3B12Si15 was 350 degrees C for 1 hour at 30 mTorr. We also produced a flux-gate magnetometer with the annealed samples with the best magnetic properties. The flux-gate sensor shows a noise level of 2.4 pT root Hz at 1 Hz, and 0.1 nT(p-p), in the frequency domain with 1 Hz bandwidth.