Patent ID: 7907370
Filing Date: 2011-03-15
Classification: B82Y,G01R,G11B,H01F,H01L

Abstract:
1. A tunneling magnetic sensing element comprising: a first magnetic layer, an insulating barrier disposed over the first magnetic layer, and a second magnetic layer disposed over the insulating barrier; wherein the first magnetic layer constitutes at least a part of a pinned magnetic layer having a pinned magnetization direction; wherein the second magnetic layer constitutes at least a part of a free magnetic layer having a magnetization direction being changed by an external magnetic field; wherein the insulating barrier is composed of Mg—O; wherein the second magnetic layer is composed of Co wherein the insulating barrier has a body-centered cubic structure in which an equivalent crystal plane typically represented as a {100} plane is preferentially oriented in the direction parallel to the interface, wherein the second magnetic layer has a body-centered cubic structure in which an equivalent crystal plane typically represented as a {100} plane is preferentially oriented in the direction parallel to the interface, wherein the first magnetic layer has an amorphous structure, wherein the first magnetic layer is composed of (Co wherein the second magnetic layer is an enhance layer, and the free magnetic layer contains the enhance layer and a soft-magnetic layer which is composed of a NiFe-alloy and is disposed on the enhance layer, the Ni composition ratio in the NiFe-alloy is 81.5% to 100%, and wherein the second magnetic layer is directly in contact with the insulating barrier, the soft-magnetic layer is directly in contact with the second magnetic layer.