Relationship between Sensor Output of a Fluxgate Magnetic Sensor and the Magnetic Domain Structure of its Core

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Abstract

  We investigated the dependence of the sensitivity and noise of fluxgate sensors on the saturation flux density and magnetostriction of an amorphous ribbon core. The relationship between the sensing properties and the domain structures were also investigated with a Kerr microscope. The noise at the zero field increased with the increase in the magnetostriction properties of the core material. The sensitivity decreased with the increase in magnetostriction. Highly magnetostrictive amorphous ribbons had maze domains that were difficult to move by applying a low magnetic field of a few Oersteds. This caused a decrease in the sensitivity of the sensors, and affected noise such as the noise that caused zero drift.

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