Power consumption is a key factor which influences overall performance of micro fluxgate sensors. To reduce power consumption

must assure thin film iron core of the device can reach saturation state under small excitation current

by reducing saturation magnetic intensity Hsof iron core to achieve this aim. Design micro fluxgate with porous film core and it is found through finite element simulation analysis. Porous structure can be effectively used as a method to decrease value of saturation magnetic intensity Hs

so as to obtain low saturation excitation current

assure sensitivity of micro fluxgate sensor and effectively reduce power consumption at the same time.