Patent ID: 7145332
Filing Date: 2006-12-05
Classification: G01R

Abstract:
1. A method for fabricating a magnetic field sensor comprising the steps of: forming a pattern on a semiconductor substrate, corresponding to a lower part of the magnetic field sensing coil, and forming the lower part by first-putting metal into the pattern; forming a first insulation film on the semiconductor substrate where the metal is first-put; accumulating a soft magnetic material film on the first insulation film, and forming a soft magnetic core by patterning and etching; forming a second insulation film on the semiconductor substrate where the soft magnetic core is formed; forming on the second insulation film a penetrating hole for fluidly communicating with the first-put metal forming the lower part, and also forming a penetrating hole for fluidly communicating with the soft magnetic core; forming a pattern corresponding to an upper part of the magnetic field sensing coil on the second insulation film, and forming the upper part by second-putting metal into the pattern; and forming a protection film on the semiconductor substrate where the metal is second-put.