Patent ID: 8045300
Filing Date: 2011-10-25
Classification: B82Y,G01R,H01F

Abstract:
1. A tunneling magnetic sensing element comprising: a pinned magnetic layer; an insulating barrier layer; and a free magnetic layer, the insulating layer being disposed between the pinned magnetic layer and the free magnetic layer; wherein the insulating barrier layer is composed of Mg—O, wherein the free magnetic layer has a first magnetic region and a second magnetic region, the first magnetic region is in contact with the insulating barrier layer, located between the second magnetic region and the insulating barrier layer, and composed of Co—Fe or Fe, and the second magnetic region is remote from the insulating barrier layer, in contact with the first magnetic region, and composed of Co—Fe—B or Fe—B, and wherein the second magnetic region has a compositionally modulated portion where the B concentration decreases gradually as the distance from the interface between the free magnetic layer and the insulating barrier layer decreases.