Patent ID: 7355822
Filing Date: 2008-04-08
Classification: A45B,B82Y,G01R,G11B,G11C,H01F,Y10T

Abstract:
1. A ferromagnetic thin-film based magnetic field sensor, said sensor comprising: an electrically insulative intermediate layer, said intermediate layer having two major surfaces on opposite sides thereof; an initial thin-film of an anisotropic ferromagnetic material on one of said intermediate layer major surfaces; and a small hysteresis thin-film formed of solely ferromagnetic material on that remaining one of said intermediate layer major surfaces of a ferromagnetic material such that said sensor has an electrical resistance versus applied external magnetic field characteristic that changes between relatively greater and smaller resistance values in response to external magnetic fields being applied thereto in opposite directions that reach field magnitudes at which said characteristic at least initially saturates with said external magnetic fields taking on zero magnitudes between reachings of said field magnitudes thereby, the differences in values of electrical resistance at said zero magnitudes of those applied external magnetic fields being less than five percent of those values of electrical resistance occurring at initial saturation in said electrical resistance versus applied external magnetic field characteristic of said sensor.