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    2.
    发明专利
    未知

    公开(公告)号：DE2553754A1

    公开(公告)日：1976-07-08

    申请号：DE2553754

    申请日：1975-11-29

    Applicant: IBM

    Inventor： ALMASI GEORGE STANLEY ,  HENDEL ROBERT JAMES ,  KEEFE GEORGE EDWARD ,  LIN YEONG SHOW ,  MCGOUEY RICHARD PETER

    IPC: G11C11/14 ,  G11C19/08 ,  H01F10/10 ,  H01F41/14 ,  H01F41/34 ,  H01F10/00

    Abstract: A method for making a high density magnetic bubble domain system including the functions of read, write, storage, transfer, and annihilation. Only three masking steps are required, of which only one requires critical alignment. The proces makes use of the fact that magnetic disks can be placed on non ion implanted regions without adversely affecting the propagation properties of the implanted regions. Thus, the magnetic disks can be used to define ion implantation masks as well as for providing functions such as generation, propagation, reading, and annihilation. Magnetic elements for generation, storage and propagation, reading and annihilation are deposited in the same non-critical masking step, while all condutors used for writing, reading, and transfer are deposited by a single masking step requiring critical alignment.

    3.
    发明专利
    未知

    公开(公告)号：DE2553257A1

    公开(公告)日：1976-07-08

    申请号：DE2553257

    申请日：1975-11-27

    Applicant: IBM

    Inventor： KEEFE GEORGE EDWARD ,  KRYDER MARK HOWARD ,  LIN YEONG SHOW

    IPC: G11C11/14 ,  C10M159/20 ,  G11C19/08 ,  H01F10/00

    Abstract: A magnetic bubble domain propagation device which is single sided and can be used to move bubble domains in amorphous magnetic films. The propagation structure is comprised of either one or two layers located on a single side of the amorphous magnetic medium. Preferably, the propagation elements in each layer are contiguous to one another to provide maximum density. In a preferred embodiment, the propagation elements are circular, but other geometries can be used. The amorphous magnetic material is deposited over these underlayer propagation elements in order to create a change in the profile of the amorphous material. This change in profile of the amorphous material acts as a restraining barrier to bubble domain movement, so that the bubble domains will move along the proper channel without drifting to other propagation channels, and will move from one propagation element to the next without merely idling at any of the propagation elements.

    4.
    发明专利
    未知

    公开(公告)号：DE2310191A1

    公开(公告)日：1974-01-24

    申请号：DE2310191

    申请日：1973-03-01

    Applicant: IBM

    Inventor： HENDEL ROBERT JAMES ,  JAMBA JUN THEODORE FRANK ,  KEEFE GEORGE EDWARD ,  ROSIER LAURENCE LEE

    IPC: G11C11/14 ,  G11C19/08

    Abstract: A structure for increasing the reliability of a magnetic bubble domain memory system in which the operating margins of various components within the system are enlarged so that the margins of the components will have a larger area of overlap. For components in which a lessening of the effect of the bias field Hz is desirable (splitters, generators, corner propagation elements, etc.), a thin layer of magnetically soft material (for instance, permalloy) is provided which extends over the area of the magnetic sheet in which the component function takes place. This thin layer is in addition to the overlay elements used to provide the function. In a memory system, selectively placed "thin patches" of permalloy or strips of permalloy are used in the critical component areas to improve operating margins of these components.

    5.
    发明专利
    未知

    公开(公告)号：DE2243979A1

    公开(公告)日：1973-05-03

    申请号：DE2243979

    申请日：1972-09-07

    Applicant: IBM

    Inventor： ALMASI GEORGE STANLEY ,  KEEFE GEORGE EDWARD

    IPC: G11C11/14 ,  G01R33/12 ,  G11C19/08 ,  G11B5/12

    Abstract: A magnetoresistive sensing device for detection of cylindrical magnetic domains (bubble domains) in magnetic bubble sheets. Cancellation of noise due to fields (such as the propagation (drive) field) which intercept the sensing element is achieved by using two magnetoresistive sensing elements whose combined voltage (or current) output is constant in the absence of a bubble domain. In one sensing element, the measuring current through the element is substantially parallel to the magnetization direction of that element, while in the second element, the measuring current is substantially perpendicular to the magnetization direction of the second element. In a preferred embodiment, two sensing elements are electrically connected in series and the sum of their resistances is constant when the device is being operated, in the absence of domains. When a domain is present, the sum of the resistances is different, so the output of the device changes. Each sensor can be associated with a different information channel (or group of channels) in which domains are propagated.

    6.
    发明专利
    未知

    公开(公告)号：DE3872438D1

    公开(公告)日：1992-08-06

    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.

    7.
    发明专利
    未知

    公开(公告)号：DE2756132A1

    公开(公告)日：1978-07-13

    申请号：DE2756132

    申请日：1977-12-16

    Applicant: IBM

    Inventor： KEEFE GEORGE EDWARD ,  LIN YEONG SHOW

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

    Abstract: A switch for transferring magnetic bubble domains from one propagation path to another using a magnetic charged wall is described. The magnetic charged wall bridges the two propagation paths and causes the domain to strip out along the charged wall. By pulsing an overlying conductor, the charged wall and the associated strip domain will shrink away from one side of the conductor in order to translate the domain to the other side. In contrast with previous transfer gates using current carrying conductors where the magnetic field produced by current through the conductors served as the major bubble translational force, the present switch utilizes a magnetic charged wall as the driving source, the current through the conductor being used only for modification of the charged wall. Therefore, the switching margins are maximized to be substantially the same as the bubble propagation margins and the switching currents required are reduced from those in previously used transfer gates. The present switch is particularly useful as a transfer gate in a major/minor loop memory which is fabricated using ion implanted propagation patterns. Various propagation element geometries can be used to provide the bridging charged wall.

    9.
    发明专利
    未知

    公开(公告)号：DE2820597A1

    公开(公告)日：1978-12-07

    申请号：DE2820597

    申请日：1978-05-11

    Applicant: IBM

    Inventor： ALMASI GEORGE STANLEY ,  KEEFE GEORGE EDWARD ,  LIN YEONG SHOW

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

    Abstract: An improved magnetic bubble domain nucleator is provided which uses a magnetic wall, such as a charged wall, Neel wall, or Bloch wall, to assist nucleation. In a preferred embodiment, a magnetic charged wall is produced in an ion implanted region of a magnetic material with an in-plane magnetic field, and an applied nucleating magnetic field is produced by current in a conductor. The combination of the first magnetic field associated with the charged wall and the second magnetic field produced by current through the conductor is sufficient to nucleate a bubble domain in the magnetic medium whereas each of these fields acting alone is not sufficient for nucleation. Since the first magnetic field provides a component of the total nucleating field, the amount of nucleation current required in the conductor is reduced. Any structure that can be used to provide the magnetic charged wall, including ion implanted regions of a magnetic material, or an apertured layer of magnetically soft material is suitable in the practice of this invention. The structure for providing the second magnetic field is conveniently provided by a current carrying conductor, or by a magnetic element having a stray field associated therewith, or even by another magnetic bubble domain. Thus, this invention seeks to use naturally occurring magnetic walls to assist bubble nucleation rather than using additional structure.

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