公开(公告)号：CA961156A

公开(公告)日：1975-01-14

申请号：CA138504

申请日：1972-03-29

Applicant: IBM

Inventor： ALMASI GEORGE S ,  KEEFE GEORGE E

IPC: G11C19/08

公开(公告)号：CA960363A

公开(公告)日：1974-12-31

申请号：CA186211

申请日：1973-11-20

Applicant: IBM

Inventor： BEAUSOLEIL WILLIAM F ,  KEEFE GEORGE E ,  WALKER ERNEST L

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

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.

公开(公告)号：CA1068402A

公开(公告)日：1979-12-18

申请号：CA238129

申请日：1975-10-20

Applicant: IBM

Inventor： KEEFE GEORGE E ,  LIN YEONG S

IPC: G11C11/14 ,  G11C19/08

Abstract: MINIMUM STRUCTURE BUBBLE DOMAIN PROPAGATION 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, ant 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.

公开(公告)号：FR2376490A1

公开(公告)日：1978-07-28

申请号：FR7736207

申请日：1977-11-24

Applicant: IBM

Inventor： KEEFE GEORGE E ,  LIN YONG S

IPC: G11C11/14 ,  G11C19/08

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.

公开(公告)号：CA1007370A

公开(公告)日：1977-03-22

申请号：CA166577

申请日：1973-03-07

Applicant: IBM

Inventor： HENDEL ROBERT J ,  JAMBA THEODORE F JR ,  KEEFE GEORGE E ,  ROSIER LAURENCE L

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.

公开(公告)号：FR2296910A1

公开(公告)日：1976-07-30

申请号：FR7534736

申请日：1975-11-07

Applicant: IBM

Inventor： KEEFE GEORGE E ,  LIN YEONG S

IPC: G11C19/08 ,  G11C11/14

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.

公开(公告)号：CA1068830A

公开(公告)日：1979-12-25

申请号：CA268718

申请日：1976-12-24

Applicant: IBM

Inventor： GIESS EDWARD A ,  KEEFE GEORGE E ,  LIN YEONG S

IPC: G11C11/14 ,  G11C19/08 ,  H01F10/00 ,  H01F10/24 ,  H01L21/265

Abstract: ION IMPLANTED BUBBLE PROPAGATION STRUCTURE An improved ion implanted propagation structure for movement of magnetic bubble domains in a storage medium which comprises an additional magnetic layer capable of ion implantation in combination with a bubble domain storage layer in which the bubble domains exist and are moved by the ion implanted layer in response to the reorientation of a magnetic field in the plane of the ion implanted layer. The ion implanted layer (drive layer) can be in intimate contact with the storage layer and exchange coupled thereto, or can be separated from the storage layer by a non-magnetic spacer. The ion implanted layer can comprise different geometry propagation elements and its thickness, 4.pi.M, and other magnetic properties are generally selected to provide flux matching of a charged wall in the ion implanted layer with the flux emanating from the bubble domains to be moved. The charged wall is coupled to the bubble domain by exchange coupling and/or magnetostatic coupling.

公开(公告)号：FR2296911A1

公开(公告)日：1976-07-30

申请号：FR7536912

申请日：1975-11-28

Applicant: IBM

Inventor： ALMASI GEORGE S ,  HENDEL ROBERT J ,  KEEFE GEORGE E ,  LIN YEONG S ,  MCGOUEY RICHARD P

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

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.

公开(公告)号：FR2296909A1

公开(公告)日：1976-07-30

申请号：FR7534735

申请日：1975-11-07

Applicant: IBM

Inventor： KEEFE GEORGE E ,  KRYDER MARK H ,  LIN YEONG S

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.

公开(公告)号：CA960361A

公开(公告)日：1974-12-31

申请号：CA124398

申请日：1971-10-05

Applicant: IBM

Inventor： ALMASI GEORGE S ,  CHANG HSU ,  KEEFE GEORGE E ,  THOMPSON DAVID A

IPC: G11C11/14 ,  G11C19/08