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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
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.
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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.
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公开(公告)号：DE2553238A1
公开(公告)日：1976-07-08
申请号：DE2553238
申请日：1975-11-27
Applicant: IBM
Inventor： LIN YEONG SHOW , STANLAND JACKSON E
Abstract: 1522707 Magnetic storage arrangements INTERNATIONAL BUSINESS MACHINES CORP 31 Oct 1975 [31 Dec 1974] 45256/75 Heading H3B A lattice of magnetic bubbles may be expanded in one or both directions and subsequently contracted to its original dimensions. Expansion in the horizontal direction only is shown in Figs. 2A and 2B, expansion in the vertical direction being prevented by energized conductors 24, a magnetic overlay, or etched grooves in the bubble-supporting garnet or amorphous magnetic material. An arrangement permitting controlled expansion in both directions is shown in Fig. 3, lattice dimensional control being effected by three conductor loops L1, L2, L3 assisted by magnetic soft elements 34. Conductor loop L1 is normally energised to confine the lattice, but this current is gradually reduced and conductors L2, L3 energized in turn to effect controlled lattice expansion, Fig. 4A (not shown). A converse pattern of current energization reduces the lattice to its original dimensions, Fig. 4B (not shown). Included in Fig. 3 is a shift register SR the magnetic bubbles B' of which couple with magnetic bubbles 36 when the lattice of bubbles B is expanded. Shift registers extending between respective bubble generators and sensors may be provided along opposite faces of the expanded lattice, Fig. 5 (not shown). Data may be stored either within the lattice itself or in an information layer magnetically coupled to the lattice. Data stored within the lattice.-As described in Specification 1454451, information is contained within the lattice in the form of the bubble chiral state or the number of block lines within a bubble domain wall. In either case bubbles are distinguished according to direction of movement in a gradient magnetic field, such a field being provided by the conductor loops L1-L3 when a lattice is expanded. A bubble sensing arrangement is shown in Fig. 7, in which only those bubbles B of a specified character move in a direction 58 when the lattice is expanded such as to couple with respective magneto resistive sensors A1-A3, B1-B3 ... The remaining bubbles move in a direction 56 sufficiently angularly displaced from direction 58 as to avoid coupling with the sensor matrix 60 which is formed on a glass substrate 62. In an alternative arrangement, Fig. 8, the gradient field is provided by one or more scanning domains SB in a further magnetic bubble layer 70, a search domain following a scanning path 74 so as to couple in turn with each of the bubbles B in an expanded lattice. As each lattice bubble is influenced by a scanning bubble SB, it is deflected in a characterising direction so as to either couple or not with a magneto resistive sensor A1-A3 in a sensing matrix 60. Data stored in an adjacent layer.-In Fig. 9 the lattice is contained in bubble layer 20, and information is stored in adjacent bubble layer 80 in the form of presence or absence of bubbles Bi in a matrix pattern, each bubble Bi being located by magnetic coupling with an underlying lattice bubble B. The information layer additionally includes magneto-resistive sensors each positioned at a location which corresponds to that of a respective lattice bubble when the lattice is expanded. Consequently when expansion takes place the coupled information bubbles are similarly displaced and the information stored read out. If required lattice bubbles may be annihilated by nucleators 82. A further arrangement, Fig. 11A, has the lattice arranged so as to expand linearly into work areas 1 and 2. In a modification, Fig. 11B, expansion into buffer zones 110, 112 is effected by reducing stripe domains 114 which repulse the magnetic bubbles B, the domains being subsequently extended to contact the lattice. Two coordinate expansion is possible by this method. Such arrangements enable the information bubbles in the overlying information layer to move into work areas for nucleation writing and annihilation, Fig. 12. As shown a work area includes a matrix of magnetic elements 122 coupled to row and column conductors 1-16 and positioned over the bubble positions in an expanded lattice. By energising a selected row and a column line from digit and selection current sources 124, 126, the coincidently-energized magnetic element can nucleate or annihilate a magnetic information bubble in the expanded pattern to which it is coupled. An alternative arrangement, Fig. 13 (not shown), comprises a matrix of magneto resistive detectors in positions corresponding to the magnetic elements. In a combination of nucleators and detectors, Fig. 14 (not shown), a matrix of magnetic elements is located in one part of a work area and a similar matrix of magneto resistive elements in the other part.
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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
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.
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公开(公告)号：DE2459312A1
公开(公告)日：1975-07-10
申请号：DE2459312
申请日：1974-12-14
Applicant: IBM
Inventor： KEEFE GEORGE EDWARD , LIN YEONG SHOW , ROSIER LAURENCE LEE
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Patent Agency Ranking
公开(公告)号：DE2854753A1
公开(公告)日：1979-07-12
申请号：DE2854753
申请日：1978-12-19
Applicant: IBM
Inventor： ALMASI GEORGE STANLEY , LIN YEONG SHOW
IPC: G11C11/14 , G11C19/08 , G11C11/155
Abstract: A bubble domain storage system is described which has the best features of contiguous element bubble propagation systems and bubble lattice file systems. An array of magnetic bubble domains, such as a lattice, is moved along contiguous propagation patterns in response to the reorientation of a magnetic field in the plane of the bubble domain film. Adjacent rows of bubble domains in the array move in opposite directions to provide individual storage loops within the array. Information accessing can be achieved by the use of input/output registers similar to those used in other contiguous disk bubble domain storage systems. For example, the storage system can be a conventional major/minor loop organization using contiguous element propagation patterns for the storage registers and for the input/output registers. Every bit position in the storage registers is populated by a bubble domain where the average distance between adjacent bubble domains is less than that in a system where bubbles are isolated from one another. For example, the storage registers can be arranged so that the separation between adjacent bubble domains in the storage registers is 2-3 bubble diameters. The bubbles are coded in terms of the magnetic properties of individual bubble domains, or a double layer structure can be used in which an array of bubble domains is in one layer and information bubble domains are in the other layer, coded in accordance with presence/absence. Viewed another way, the invention is a bubble storage system using contiguous propagation elements which is fully populated by interacting bubble domains.
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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
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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公开(公告)号：DE2655572A1
公开(公告)日：1977-07-14
申请号：DE2655572
申请日：1976-12-08
Applicant: IBM
Inventor： GIESS EDWARD AUGUST , KEEFE GEORGE EDWARD , LIN YEONG SHOW
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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
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.
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公开(公告)号：DE2457163A1
公开(公告)日：1975-07-10
申请号：DE2457163
申请日：1974-12-04
Applicant: IBM
Inventor： LIN YEONG SHOW
Abstract: Gapless, double-sided propagation structures are provided for implementing the continuous movement of magnetic bubble domains under the control of a reorienting in-plane field. Propagation is achieved by using two identical disc circuits on both sides of the bubble material displaced from each other by one-half of periodicity. The discs in each circuit are disposed in tangential engagement with each other and the two circuits may follow any desired path provided the circuits are in alignment with each other.
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