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    1.
    发明专利
    未知

    公开(公告)号：DE2432259A1

    公开(公告)日：1975-04-10

    申请号：DE2432259

    申请日：1974-07-05

    Applicant: IBM

    Inventor： BROCK GEORGE WILLIAM ,  SHELLEDY FRANK BOYD ,  SMITH SIDNEY HENRY ,  WILLS ARTHUR BARTON

    IPC: G11B5/33 ,  G11B5/39 ,  G11B5/30 ,  G11B5/28

    Abstract: A magnetoresistive (MR) head with an unusually desirable spatial resolution includes a shield on each side of the MR element. Information is carried on a magnetizable medium as recorded magnetic areas. The shields are spaced apart by a distance on the order of and less than the shortest recorded wavelength for which the head is meant to be used. The MR element and the shields have their edges nearest the medium in a common plane perpendicular to the vertical component of a signal from the recorded area. An additional shunt bias layer may be provided immediately adjacent and coextensive the MR element, and the head may serve one or many tracks.

    INTERNALLY BIASED MAGNETORESISTIVE MAGNETIC TRANSDUCER
    9.
    发明专利
    INTERNALLY BIASED MAGNETORESISTIVE MAGNETIC TRANSDUCER 未知

    公开(公告)号：AU6061373A

    公开(公告)日：1975-03-27

    申请号：AU6061373

    申请日：1973-09-24

    Applicant: IBM

    Inventor： O'DAY RICHARD LEWIS ,  SHELLEDY FRANK BOYD

    IPC: G01R33/09 ,  G11B5/02 ,  G11B5/03 ,  G11B5/39 ,  H01F1/00 ,  G11B5/30 ,  G11B5/34

    Abstract: A magnetic transducer exhibiting the magnetoresistive (MR) effect includes at least two thin film layers. A three-legged MR film in electrical contact with a higher resistivity layer is magnetically biased by a portion of the MR sense current shunted through the nonmagnetic layer. The need for an accurate and stable bias to reduce distortion is eliminated by subjecting similar adjacent MR elements to opposite currents. Each element is then symmetrically and oppositely biased so that a differential resistance sensing circuit provides an output signal relatively immune to distortion.

    10.
    发明专利
    未知

    公开(公告)号：DE2341648A1

    公开(公告)日：1974-04-25

    申请号：DE2341648

    申请日：1973-08-17

    Applicant: IBM

    Inventor： ABBOTT CHESTER DANIEL ,  BROCK GEORGE WILLIAM ,  ROBINSON NEIL LLOYD ,  SHELLEDY FRANK BOYD ,  SMITH SIDNEY HENRY

    IPC: B24B49/00 ,  G11B5/187 ,  G11B5/23 ,  G11B5/31 ,  G11B5/42

    Abstract: 1420130 Making magnetic heads INTERNATIONAL BUSINESS MACHINES CORP 11 Sept 1973 [11 Oct 1972] 42651/73 Heading G5R In a method of making magnetic heads to obtain a desired throat height an electrically conductive film 2, 3, 4 is deposited on a substrate 1 to form a plurality of heads 2, 3 each having a transducing element conductive film portion with an initial excess of material on one side, and there being a bridge conductive film portion 4 connecting the transducing element portions of adjacent heads, the bridge being located on the side with the initial excess of material, a respective pair of leads 5, 6, 7, 8 for each head are arranged so that the leads are connected by the transducing element portion of the respective head, the resistance of the bridge portion is then monitored through two leads connected to different heads whilst removing material at a first rate from the bridge portion and substrate until the monitored resistance indicates circuit discontinuity between the transducing element portions of the heads initially connected by the bridge portion, and then the resistance of at least one transducing element portion is monitored through the leads eonnected thereto whilst removing material at a second rate from the one side of the transducing element portions and substrate until the resistance or resistances being monitored has or have reached a predetermined value indicative of the desired throat height. The method may be applied to multiturn heads or single turn heads, e.g. as disclosed in Specifications 1,343,860 and 1,372,474, and of inductive type having a copper film 2, 3 single turn with a nickel-iron alloy magnetic yoke 9, 9 1 , or of magnetoresistive type having a single magnetoresistive turn on a nickel-iron substrate. The material removal may be by grinding, lopping or weaving or by electrochemical techniques. Bridges 4 between adjacent conductor elements 2, 3 of a multitrack head may be rough ground whilst monitoring the resistance of each bridge in turn, e.g. via leads 5, 8 and scanning switchgear, Fig. 4 (not shown), until a desired number of bridges break, indicated by open circuits. The heads are then fine ground whilst monitoring the resistance of each element 2, 3 in turn. The head assembly may be adjusted in any of two or three axes during grinding to provide uniform material removal and compensation for fabrication tolerances, uneven removal being indicated by different monitored resistances. The grinding operations may be computer controlled.

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