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    13.
    发明专利
    未知

    公开(公告)号：DE2511402A1

    公开(公告)日：1975-10-02

    申请号：DE2511402

    申请日：1975-03-15

    Applicant: IBM

    Inventor： LIN YEONG SHOW ,  LIU CHAO-NING ,  TANG DONALD TAO-NAN

    IPC: G11C11/14 ,  G09C1/00 ,  G11C19/08

    Abstract: The data stored in a coincident block access bubble domain memory with bit-organized chips is encrypted by skewing or permuting selected word bits by predetermined amounts. This is implemented by providing an additional current loop on some or all of the chips which overlies the major loop pattern and has nodes at the similar vector poles of the major loop. The proper energization of selected ones of these additional current loops, under the control of a security key, inhibits or suppresses the advance of the bubble domains in the corresponding major loops for a predetermined number of cycles of the in-plane propagating field, thus skewing the word bits in these chips with respect to the remaining word bits in the unsuppressed chips. Decryption is accomplished by further inhibiting the same major loops for the necessary number of cycles to restore word bit synchronization throughout the memory.

    15.
    发明专利
    未知

    公开(公告)号：DE2241906A1

    公开(公告)日：1973-05-03

    申请号：DE2241906

    申请日：1972-08-25

    Applicant: IBM

    Inventor： ALMASI GEORGE STANLEY ,  KEEFE GEORGE EDWARD ,  LIN YEONG SHOW ,  THOMPSON DAVID ALLEN

    IPC: G11C11/14 ,  G01R33/09 ,  G11B5/02 ,  G11B5/39 ,  G11B5/30

    Abstract: 1369573 Magnetic storage devices INTERNATIONAL BUSINESS MACHINES CORP 28 Sept 1972 [26 Oct 1971] 44737/72 Heading H3B A sensor of small magnetic fields, such as bubble domains, comprises a magneto-resistive element whose dimensions are sufficiently small, e.g. 200 angstroms thick, 7À5 microns long and 5 microns wide, as to have both a uniaxial anisotropy field imparted during manufacture, and a shape anisotropy field determined by the relationship of its unequal length and width dimensions, the two anisotropy fields being mutually perpendicular and the larger of the two fields being substantially perpendicular to the magnetic field to be detected. As shown in Fig. 1A, a rectangular magnetoresistive element 18 is associated with an orthoferrite or garnet sheet 10 in which bubble domains are propagated by the combination of a permalloy T and I bar pattern and an in-plane rotating magnetic field H. A rectangular magnetoresistive sensor element 18 formed, e.g. of permalloy; and located on or adjacent to the sheet 10, is connected to a constant current source 20 by leads 19, changes of resistance due to magnetic field proximity being indicated to a utilization means 22 as a change of voltage Vs. The sensor element has an easy axis of magnetization E.A. transverse to its length, and has a shape anisotropy field greater than the uniaxial anisotropy field so that the magnetization vector M is normally directed along the length of the element. When a bubble domain 30, Fig. 1B, is moved into a position adjacent the sensor element 18, the external field H B of the domain coupled with the element causes rotation of its magnetization vector M and consequential change in the element resistance. It is stated that the use of both uniaxial and shape anisotropy enhances the detection sensitivity to small magnetic fields. In a modification. Figs. 2A and 2B, the sensor element is arranged so that it is parallel to an external domain field H B along its length dimension. As before the easy axis of magnetization E.A. extends across the width of the element, but in this case the shape anisotropy field is less than the uniaxial anisotropy field so that the normal position of the magnetization vector M is parallel to the easy direction of magnetization. This vector is rotated towards the length dimension of the element by an adjacent bubble domain 30 as shown in Fig. 2B. The sheet 10 is subjected to a bias field H z derived from a permanent magnet, an energized coil or an adjacent magnetic sheet. The sensor may be used to read out a pattern of domain reversals extending across a moving magnetic tape, Fig. 3A (not shown), in which case the sensor element is mounted with electrical connections on an insulating substrate. Such an element is formed by evaporation deposition on a magnetic sheet or insulating substrate in the presence of a magnetic field with the subsequent selective formation of electrical connections by masking, electroplating and etching.

    16.
    发明专利
    未知

    公开(公告)号：DE2227007A1

    公开(公告)日：1973-01-11

    申请号：DE2227007

    申请日：1972-06-02

    Applicant: IBM

    Inventor： CHANG HSU ,  KEEFE GEORGE EDWARD ,  LIN YEONG SHOW ,  ROSIER LAURENCE LEE

    IPC: G11C19/08 ,  H03M7/00 ,  G11C19/00

    Abstract: A decoder for cylindrical magnetic domain shift registers having means to clear the information from selected registers thus enabling new information to be written into those registers. The decoder is incorporated into 2N closed loop shift registers and uses only a small part of the storage area of the magnetic sheet in which domains exist. It is activated by 2N control lines (N pairs). Depending upon the activation of the decoder, the information in a selected shift register is passed to a clear means which sends it into one of two paths depending upon the activation of the clear means. One path brings the information to a detector for destructive readout, while the other path brings the information to a domain splitter. The domain splitter splits the input domains into two parts, one of which propagates to the detector while the other returns to the proper shift register. Thus, non-destructive readout (NDRO) or destructive read-out (DRO) is provided depending upon the activation of the clear means.

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