Theoretical calculation for magnetometric sensor based in anhysteretic processes

In this work, we present a theoretical study to measure weak magnetic field based on measurements of anhysteretic states of a ferromagnetic nucleus. In order to improve this magnetometric sensor, cores of amorphous ribbons with different characteristics have been tested. The sensitivity of this device exhibits a great dependence on the magnetic anisotropy distribution of the core. The theoretical curves obtained are in good agreement with the experimental results, except in the proximity to zero field, where the magnetization processes are mainly due to domain walls displacements.