Patent ID: 7907370

Claim:
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 100-x Fe x having a Fe composition ratio X of about 50 at % to 90 at %, 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 100-Y Fe y ) z B 100-Z , the atomic ratio Y is about 25 to 100 at %, and the composition ratio Z is about 70 to 100 at %, 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.