Patent ID: 6638691
Filing Date: 2003-10-28
Classification: H01L,Y10T

Abstract:
A method for fabricating a plate type magnetic resistance sensor chip, comprising the steps of:establishing sensing parts by depositing a characteristic membrane composed of NiCo and NiFe on a surface of a glass wafer, exposing the membrane to light, and etching the membrane in a predetermined pattern; forming a protective film atop each of the sensing parts by depositing a SiO2 membrane over the glass wafer, exposing the SiO2 membrane to light, and etching the SiO2 membrane in the same pattern as in the sensing part; subjecting the resulting structure to sand blasting to form through-holes at every corner of the sensing parts; depositing a NiFe film around the through-holes on both sides of the glass wafer and within the through-holes; and dicing the glass wafer into individual rectangular magnetic resistance sensor chips in such a way that each magnetic resistance sensor chip has four arc corners with a NiFe conductor established at every arch corner on both sides of the glass wafer, said NiFe conductor serving as a terminal part.