| 摘要 |
A central region susceptible to medium magnetic field is formed. End regions (13 to 15) sandwich and extend from the ends of the central region, and apply a vertical bias to the central region. These regions are formed on a substrate (1 to 5). The central region comprises a laminate layer having a SAL layer (5), a magnetic separation layer (6), a magnetoresistance layer (8), and an insulating layer (9), these layers being nearer the substrate in the mentioned order. The thicknesses of the individual layers, particularly the thickness of the insulating layer, are controlled to satisfy a relation of the thicknesses and ion milling rates of the layers given as:( delta a/Ra)+( delta b/Rb)<( delta c/Rc)+( delta d/Rd)where delta a and Ra are respectively thickness and ion milling rate of the horizontal bias layer, delta b and Rb are those of the magnetic separation layer, delta c and Rc are those of the magnetoresistance layer, and delta d and Rd are those of the insulating layer.
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