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    • 30. 发明授权
    • Thin-film magnetic head
    • 薄膜磁头
    • US4490760A
    • 1984-12-25
    • US340367
    • 1982-01-18
    • Nobuyuki KaminakaKenji KanaiNoboru Nomura
    • Nobuyuki KaminakaKenji KanaiNoboru Nomura
    • G11B5/187G11B5/31H01F10/28G11B5/16G11B5/20G11B5/25
    • G11B5/31
    • A thin-film magnetic head having a magnetic substrate made from ferrite, iron-aluminum-silicon alloy or like material, and an upper magnetic layer formed on the magnetic substrate with a lower magnetic layer and a conductive layer interposed therebetween. A portion of the upper magnetic layer is jointed to the magnetic substrate while another portion of the upper magnetic layer is jointed to the lower magnetic layer through a non-magnetic layer of SiO.sub.2 or like material constituting a magnetic gap. The lower magnetic layer, magnetic substrate, upper magnetic layer and the non-magnetic layer in combination form a closed magnetic circuit. A groove is defined between the lower magnetic layer and the magnetic substrate, and formed in the side surface of the magnetic substrate adapted to face a magnetic recording medium. The recess is filled with a non-magnetic material such as glass. Accordingly, it is possible to realize a definite pole piece length to permit an improvement in short-wavelength reproduction characteristics.
    • 具有由铁氧体,铁 - 铝 - 硅合金等材料制成的磁性基板的薄膜磁头和在磁性基板上形成有较低磁性层和介于其间的导电层的上部磁性层。 上部磁性层的一部分与磁性基板接合,另一部分上部磁性层通过构成磁隙的SiO 2或类似材料的非磁性层与下部磁性层接合。 下磁层,磁性基板,上磁层和非磁性层组合形成闭合磁路。 在下磁性层和磁性基板之间形成凹槽,并且形成在适于面向磁记录介质的磁性基板的侧表面中。 该凹部填充有诸如玻璃之类的非磁性材料。 因此,可以实现确定的极片长度以允许改善短波长再现特性。