| 摘要 |
There are provided a magnetic reproducing head and a magnetic recording head, which are easy to manufacture and suited for recording and reproducing by means of magnetic recording medium of narrow track size. The magnetic reproducing head is constituted by a GMR or TMR magnetic sensor, and a flux guide for introducing a magnetic flux into the magnetic sensor, wherein at least a portion of the flux guide is constituted by a material which is capable of permitting the magnetic flux to pass therethrough at a temperature of not lower than a predetermined temperature Tp, but not permitting the magnetic flux to pass therethrough at a temperature of lower than Tp. Light is irradiated to only a portion of the flux guide to cause the temperature of the irradiated portion to rise up to Tp or more, thereby permitting a magnetic flux to pass only through the irradiated portion, thus narrowing the track width of magnetic reproducing head on the occasion of detecting a magnetic recording information from the magnetic recording medium.
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