The reluctance effective die magnetometric sensor and structure membrane of the spin valve die enormous reluctance

摘要

PROBLEM TO BE SOLVED: To manufacture a spin valve type giant magnetoresistive effect type magnetic sensor, as well as a magnetoresistive effect type magnetic head, which uses an anti- ferromagnetic layer for stabilizing bias, capable of, in a limited manner, electrifying a sense current in the region of high sensitivity. SOLUTION: There are provided a process where a mask layer which comprises a wide head part and a narrow neck part nearer to a base part is formed on a magnetization free layer 14, a process where an antiferromagnetic layer 42 for stabilizing bias to the magnetization free layer 14 is formed from above the mask layer, across the entire surface, by a coating method having directivity in the direction almost vertical to the surface of a component film, a process where an insulating layer 43 is formed from above the mask layer, across the entire surface, by a coating method diagonally incident on the surface of the component film, and a process where the antiferromagnetic layer 42 for stabilizing bias and the insulating layer 43 which stick to the mask layer are selectively removed. A sense current is limitedly electrified in the region where the antiferromagnetic layer 42 for stabilizing bias and the insulating layer 43 are removed, to improve sensitivity and for stabilization.