Magnetic sensor with member having magnetic contour anisotropy.

摘要

A counterpart yoke (20) is disposed above a magnet (10). The thickness of the counterpart yoke (20) is equal to or slightly smaller than the resolution. The counterpart yoke (20) has a magnetic contour anisotropy for restraining the divergence of the magnetic flux from the magnet (10). The resolution will not be reduced depending on the distance between a medium (16) and magnetoresistance element (MR1 and MR2). The magnet (10) can be miniaturized. The resolution is further improved when the magnetoresistance elements (MR1 and MR2) are disposed on the side of the counterpart yoke (20). <IMAGE>