| 摘要 |
A shielded magnetic head (14) includes a magnetically shielded gap (7) and first to fourth conductive magnetic films (1,2,3,4) disposed in the gap. The first to fourth conductive magnetic films, each extending parallel to a tip face of a magnetic head to be opposed to a magnetic recording medium (8), are aligned at a distance from one another in a direction perpendicular to the tip face so as to be away from the tip face in ascending order and connected to one another so as to form a bridge circuit. The distance between the first conductive magnetic film and the tip face is set so that a signal magnetic field (10,11) from the magnetic recording medium is applied to the first conductive magnetic film (1). By canceling impedance components that do not vary depending on a magnetic field, the shielded magnetic head detects only impedance components that vary depending on a signal magnetic field. <IMAGE> <IMAGE>
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