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___________________________________________________________________________ The possibilities to improve the performance of certain fluxgate sensor types are still not exhausted. Two types of closed-path sensorsring core and racetrackwere 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 -12 mm -diameter, the ring cores fared better and reproducibly achieved noise 7 pT / √Hz @ 1Hz when thoroughly fixed and 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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The ferromagnetic anisotropy of resistivity as well as the effective resistivity of nanocrystalline Fe-based metallic glasses with different volumetric fraction of crystalline phase have been studied. It has been shown that the ferromagnetic anisotropy of resistivity can be considered as a sum of two independent contributions of the opposite sign positive, originating from the residual amorphous matrix and negative from the crystallites.