| 摘要 |
A magnetic sensor includes a magnetoresistive effect layer (MR layer), on which permanent magnet layers are superimposed, the permanent magnet layers having slanted edges forming an angle phi with respect to the direction of an electric current I. The electrical resistance of the permanent magnet layers is higher than that of the MR layer. Due to the N and S polarities of the opposing slanted edges, sections of the MR layer located between the opposing slanted edges are magnetized with the angle phi such that a single magnetic domain is formed. The direction of magnetization M is at an angle phi of approximately 45 DEG with respect to the electric current I, so that it is possible to detect a change in the electrical resistance of the MR layer whenever there is a change in the external magnetic field H. Since the sections of the MR layer located between the opposing slanted edges are effected by the single magnetic domain in a direction having the angle phi relative to the direction of the applied current, a reduction in Barkhausen noise can be achieved.
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