Patent ID: 6579728
Filing Date: 2003-06-17
Classification: G06K,G11B,H01L

Abstract:
A method for fabricating a magnetoresistive sensor from a silicon wafer having a first side and a second side, comprising the steps of:masking the first side of the silicon wafer with a plurality of substantially parallel strips of masking material spaced from one another; scribing the second side of the silicon wafer with a first set of substantially parallel scribe lines spaced from one another, said scribed lines being substantially perpendicular to said strips of masking material; cleaving the wafer along every other scribe line in said first set to produce a plurality of silicon bars with cleaved edges; coating the silicon bars with permalloy to cover the first side and the cleaved edges; scribing the coated silicon bars with a second set of substantially parallel scribe lines; cleaving the bars along said second set of scribe lines to produce a plurality of silicon blocks; and removing the parallel strips of masking material and cleaving each of said blocks along remaining scribe lines in said first set to produce a plurality of magnetoresistive sensors for use as credit card readers.