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    • 9. 发明授权
    • Pick-up device for magnetically recorded information and method and
system for using same
    • 用于磁记录信息的拾取装置及其使用方法和系统
    • US4228473A
    • 1980-10-14
    • US952663
    • 1978-10-19
    • Masami HimuroToshiro YamadaYoshimi Makino
    • Masami HimuroToshiro YamadaYoshimi Makino
    • G11B5/02G11B5/39G11B5/49G11B11/10G11B11/105H01F10/22G11B5/32G11B7/02G11C11/14G11C11/42
    • G11B5/3916G11B11/10547G11B5/4946H01F10/22
    • A pick-up device for reading out information which has been recorded on a magnetic medium. The device comprises a substrate and a layer of soft magnetic material overlying a surface of the substrate, the easy axis or direction of magnetization being normal to the surface and the magnetic material having properties capable of having magnetic bubble domains generated and propagated therein, so that when the pick-up device is used to read out information from a magnetic medium, patterns of magnetic domains are formed in the layer of magnetic material corresponding to the patterns of the recorded information. Although the magnetic material is of the type capable of having magnetic bubble domains generated and propagated therein, there is no need to provide the usual bias field for maintaining the bubble domains or for providing domain-transport or domain-annihilating fields. In one use of the pick-up device, light is transmitted through the substrate and through the layer of magnetic material to be reflected from a layer of light-reflective material back through the magnetic material and the substrate, whereby the polarization of the reflected light is rotated, relative to the polarization of the transmitted light, by an amount determined by the patterns of magnetic domains formed in the layer of magnetic material. Hence, the recorded information can be optically read from the magnetic medium. In another use of this device, a magnetoresistive head is disposed on the substrate, the resistance of this magnetoresistive head being varied as a function of the patterns of magnetic domains formed in the layer of magnetic material.
    • 用于读出记录在磁性介质上的信息的拾取装置。 该装置包括衬底和覆盖在衬底表面上的软磁材料层,容易的轴线或磁化方向垂直于表面,磁性材料具有能够在其中产生和传播的磁性气泡域的特性,使得 当拾取装置用于从磁性介质读出信息时,磁性层的图案形成在与记录的信息的图案对应的磁性材料层中。 虽然磁性材料是能够在其中产生和传播的磁性气泡畴的类型,但是不需要提供用于维持气泡域的通常的偏置场或用于提供域传输或域消除场。 在拾取装置的一个用途中,光被透过基板并通过磁性材料层从光反射材料层反射回到磁性材料和基片上,由此反射光的偏振 相对于透射光的偏振旋转由磁性材料层中形成的磁畴的图案确定的量。 因此,记录的信息可以从磁介质光学读取。 在该器件的另一用途中,磁阻头被设置在衬底上,该磁阻磁头的电阻随着形成在磁性材料层中的磁畴的图案而变化。