Copper permalloys for fluxgate magnetometer sensors

• Published in: Geoscientific instrumentation, methods and data systems Vol. 13; no. 1; pp. 131 - 161
• Main Authors: Narod, B. Barry, Miles, David M
• Format: Journal Article
• Language: English
• Published: Gottingen Copernicus GmbH 05.06.2024; Copernicus Publications
• Subjects: Alloys; Anisotropy; Copper; Cores; Ferromagnetism; Ferrous alloys; Fluxgate magnetometers; Investigations; Iron; Iron constituents; Laboratories; Magnetic alloys; Magnetic field; Magnetic fields; Magnetic properties; Magnetometers; Metallurgical constituents; Molybdenum; Molybdenum alloys; Molybdenum base alloys; Nickel; Noise; Noise measurement; Permeability; Power consumption; Sensors; United States > US
• DOI: 10.5194/gi-13-131-2024
• ISSN: 2193-0856

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 â¼30 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 s INTERMAGNET standard of less than 10 pT/Hz noise at 0.1 Hz.