Patent ID: 7911744

Claim:
A magneto-resistive effect device having a CPP (current perpendicular to plane) structure comprising a multilayer device assembly comprising a first ferromagnetic layer, a spacer layer, a second ferromagnetic layer and a cap layer stacked one upon another in order, with a sense current applied in a stacking direction of said multilayer device assembly, characterized in that in the rear of said multilayer device assembly, there is a refilled insulation layer formed, which is in contact with a rear end face of said multilayer device assembly and extends rearward, wherein: the uppermost position P of said refilled insulation layer that is in contact with the rear end face of said multilayer device assembly lies at a rear end face of the cap layer and is set in such a way as to satisfy a relation: 0.2≦(T2/T1)<1 where T1 is a thickness of the cap layer, and T2 is the absolute value of a distance from the uppermost portion of the cap layer down to the position P as viewed in a thickness direction.