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    11.
    发明专利
    未知

    公开(公告)号：DE2554462A1

    公开(公告)日：1976-07-08

    申请号：DE2554462

    申请日：1975-12-04

    Applicant: IBM

    Inventor： KEEFE GEORGE EDWARD ,  LIN YEONG SHOW

    IPC: G11C11/14 ,  G11C19/08 ,  H01F10/00

    Abstract: It has been discovered that magnetic bubble domains can be moved in a magnetic medium without requiring shaped structure along which magnetic poles are created for movement of the domains, and without reliance on magnetic fields established by conductor patterns. If a magnetic field is applied in the plane of the magnetic medium, bubble domains will be stretched in a direction parallel or anti-parallel to the field direction depending on the bubble domain polarity. If this magnetic field has an asymmetry in its amplitude versus time waveform, or if an asymmetry is created by a propagation element, bubble domains can be moved in the magnetic material. This discovery can be used to move bubble domains in a magnetic medium without requiring structure having a particular shape for domain movement, and without requiring conductors. Also, improvements can be made to existing propagation structures to make them more useful.

    12.
    发明专利
    未知

    公开(公告)号：DE2333749A1

    公开(公告)日：1974-07-04

    申请号：DE2333749

    申请日：1973-07-03

    Applicant: IBM

    Inventor： BEAUSOLEIL WILLIAM FRANCIS ,  KEEFE GEORGE EDWARD ,  WALKER ERNEST LEE

    IPC: G11C11/14 ,  G01R33/09 ,  G11C19/08 ,  G11C21/00

    Abstract: A plurality of magneto-resistive sensing elements are connected in series and positioned adjacent magnetic bubble domain propagation paths in a compressor circuit. If a data representing bubble is injected into the beginning of the circuit, each bubble already present is forced over to the next idler position. As the bubbles pass the sensing elements their magnetization vectors are rotated producing corresponding changes in the resistance values of the sensors, which may be easily detected as a large magnitude signal indicating the presence of a data bubble.

    14.
    发明专利
    未知

    公开(公告)号：DE3872438T2

    公开(公告)日：1993-01-14

    申请号：DE3872438

    申请日：1988-04-21

    Applicant: IBM

    Inventor： DOVE DEREK BRIAN ,  KEEFE GEORGE EDWARD ,  YARMCHUK EDWARD JOHN

    IPC: B41J2/42 ,  B41J2/43 ,  B41J2/385

    Abstract: A magnetographic printing head (26) comprises an array of crossed elongated bar-shaped print elements (58, 62) each of which is individually magnetizable by electrical conductors (40) wound about respective ones of the print elements (58, 62). The print elements (58, 62) are arranged in two parallel arrays which are spaced apart from each other to define a passage (24) through which a magnetic medium (22) is to be passed for the imprinting of marks (66) thereon. A mark (66) can be imprinted at each cross point (64) of the crossed arrays upon application of sufficient magnetizing current to each of the print elements (58, 62) at the cross point (64). The print elements (58, 62) are specifically shaped to provide for concentration of magnetic fields at the cross points (64) in two dimensions to accomplish high resolution printing. The concentration of the fields is accomplished in one embodiment of the invention by the use of a knife-edge (68) configuration to opposed facing surfaces of the elements of the opposed arrays, and in a second embodiment by a set of pedestals (72) upstanding from the elements of one of the arrays. The resulting configuration of the print head (26) has structural simplicity which permits economical fabrication while retaining high resolution in the printing.

    18.
    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.

    19.
    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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