Copper permalloys for fluxgate magnetometer sensors

Abstract

Abstract. Fluxgate magnetometers are commonly used to provide high-fidelity vector magnetic field measurements. The magnetic noise of the measurement is typically dominated by that intrinsic to a ferromagnetic core used to modulate (gate) the local field as part of the fluxgate sensing mechanism. A polycrystalline molybdenum-nickel-iron alloy (6.0–81.3 Mo Permalloy) has been used in fluxgates since the 1970s for its low magnetic noise. Guided by previous investigations of high permeability copper-nickel-iron alloys, we investigate alternative materials for fluxgate sensing by examining the magnetic properties and fluxgate performance of that permalloy regime in the range 28–45 % Cu by weight. Optimizing the alloy constituents within this regime enables us to create fluxgate cores with both lower noise and lower power consumption than equivalent cores based on the traditional molybdenum alloy. Racetrack geometry cores using six layers of ~30 mm long foil washers consistently yield magnetic noise around 4–5 pT/√Hz at 1 Hz and 6–7 pT/√Hz at 0.1 Hz meeting the 2012 1-second INTERMAGNET standard of less than 10 pT/√Hz noise at 0.1 Hz.

First In Situ Measurements of the Prototype Tesseract Fluxgate Magnetometer on the ACES-II Low Sounding Rocket

“…New advances in fluxgate core technology (Miles et al 2022;Narod and Miles 2023) are enabling new designs for fluxgate sensors not previously possible with ring cores. Miles et al, 2019 enabled the manufacturing of new miniature racetrack geometry cores which were found to have a more consistent yield and lower noise performance cores than the traditional ring core manufacturing process (Miles et al 2022).…”