Preprints
https://doi.org/10.5194/egusphere-2023-2191
https://doi.org/10.5194/egusphere-2023-2191
28 Sep 2023
 | 28 Sep 2023

Copper permalloys for fluxgate magnetometer sensors

B. Barry Narod and David M. Miles

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.

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B. Barry Narod and David M. Miles

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-2191', Anonymous Referee #1, 30 Oct 2023
    • AC1: 'Reply on RC1', David Miles, 23 Nov 2023
  • RC2: 'Comment on egusphere-2023-2191', Anonymous Referee #2, 03 Nov 2023
    • AC2: 'Reply on RC2', David Miles, 23 Nov 2023

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-2191', Anonymous Referee #1, 30 Oct 2023
    • AC1: 'Reply on RC1', David Miles, 23 Nov 2023
  • RC2: 'Comment on egusphere-2023-2191', Anonymous Referee #2, 03 Nov 2023
    • AC2: 'Reply on RC2', David Miles, 23 Nov 2023
B. Barry Narod and David M. Miles
B. Barry Narod and David M. Miles

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Short summary
We present experimental results of a new copper-based alloy suitable for use in high-precision magnetic sensing. It out-performs the current state of the art by providing lower magnetic noise and superior power consumption. Prototype sensors constructed from this material can meet an exacting standard, the 2012 1-second INTERMAGNET standard, for magnetic observatories.