Abstract
The possibilities to improve the performance of certain fluxgate sensor types are still not exhausted. Two types of closed-path sensors – ring core and racetrack – were checked to reveal risky combination of material and construction parameters, and means to optimize the combination were tested. One-step field annealing of Co-based metallic glass was chosen to acquire low-magnetostrictive material with anisotropy required to reduce noise by favoring magnetization rotation. Locally misaligned anisotropy promoted incoherent rotation and handicapped racetrack noise performance. Despite the risk of bending stress aggravated by small – 12mm diameter, the ring cores fared better and reproducibly achieved noise 7pT/√Hz @ 1Hz when thoroughly fixed an annealed in an optimal sheath. As far as we know these are the lowest noise values achieved for this size of fluxgate sensors.
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