| 摘要 |
A magnetic sensor comprises a spin-valve type magnetoresistive element arranged on a substrate, wherein a bias magnetic layer made of a permanent magnet film is connected with both ends of the magnetoresistive element so as to detect the magnitude of a magnetic field. The bias magnetic layer is formed on an embedded layer made of a non-magnetic material, which comprises a thick first layer and a thin second layer that are sequentially formed and laminated together. The bias magnetic layer is composed of a CoCrPt alloy, and the thickness thereof ranges from 800 Å to 900 Å; the embedded layer is composed of Cr or a Cr alloy; the thickness of the first layer ranges from 2 nm to 10 nm. Thus, it is possible to freely set the combination of the coercive force and residual magnetism in the bias magnetic layer without changing the composition of a target.
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