Patent ID: 6600314
Filing Date: 2003-07-29
Classification: B82Y,G01R,H01F,Y10S

Abstract:
A tunneling magnetoresistive effect device comprising:a soft magnetic layer for assisting magnetic field sensing operations, the soft magnetic layer being stacked on a surface of a substrate; a first spin polarization layer that is stacked on the soft magnetic layer, and has a higher coercive force and a higher spin polarization rate than the soft magnetic layer; a tunneling layer that covers the soft magnetic layer and the first spin polarization layer, and is made of an insulating material or a dielectric material; and a second spin polarization layer that is stacked on the tunneling layer, wherein a magnetism sensing unit is formed by the lamination structure comprising the soft magnetic layer, the first spin polarization layer, the tunneling layer, and the second spin polarization layer, and a thickness of the first spin polarization layer is smaller than either a thickness of the tunneling layer or 2 nm.