公开(公告)号：DE2817862A1

公开(公告)日：1978-12-14

申请号：DE2817862

申请日：1978-04-24

Applicant: IBM

Inventor： BEALL GREGORY WALTER ,  COHEN MITCHELL SIMMONS ,  KRYDER MARK HOWARD

IPC: G11C11/14 ,  G11C19/08 ,  H03K17/84 ,  H01F10/00

Abstract: SLM field access bubble devices which include at least one conductor crossing a bubble propagation path have severely limited operating margins (especially for small bubbles) for the bubble in the vicinity of the conductor. Apparatus and method for operating such a bubble device is disclosed which improves the device operation in this region. The improved apparatus and method provides an additional field source with a sense and magnitude to support the bubble when it reaches the conductor region. Such a field source, as disclosed, includes a current pulse in the conductor.

公开(公告)号：DE2917062A1

公开(公告)日：1979-11-15

申请号：DE2917062

申请日：1979-04-27

Applicant: IBM

Inventor： DEUTSCH ALINA ,  KRYDER MARK HOWARD ,  NYSTROM WALTER

IPC: G11C11/14 ,  G11C19/08 ,  G11C19/28 ,  G11C11/155

Abstract: A magnetic bubble domain storage system comprising an array of rows and columns of logical chips are organized into logical half-chips with even numbered bits in one half-chip and odd numbered bits in the other half-chip. Alternating rows of half-chips are used for storing even numbered bits and odd numbered bits, respectively. Each half-chip has its own bubble domain generator, but a common generator current line serves all generators for a row of even half-chips and all generators for a row of odd half-chips. Thus, information is written into even half-chips and odd half-chips at the same time by pulsing the generator current line common to a row of even half-chips and a row of odd half-chips. Each half-chip has a sensing element and all the sensing elements corresponding to a row of half-chips are connected in series. The series connection of sensors in any row forms one leg of a bridge circuit, and another leg of the bridge circuit is another series connection of sensors in another row of the storage array. One of these legs corresponds to sensors from a row of even half-chips while the other leg corresponds to sensors from a row of odd half-chips. The other two legs of the bridge circuit are comprised of dummy resistors. Even though two rows of sensors are connected to the same bridge circuit, even numbered bits and odd numbered bits will be read at alternating times.

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.

公开(公告)号：DE2917621A1

公开(公告)日：1979-11-08

申请号：DE2917621

申请日：1979-05-02

Applicant: IBM

Inventor： KRYDER MARK HOWARD

IPC: G11C11/14 ,  G11C19/08 ,  G11C11/15

Abstract: A magnetic bubble domain chip having two levels of metallurgy fabricated in a single masking step and including a replicate type bubble generator. The bubble generator includes a magnetic disk which holds a seed domain during reorientation of a magnetic drive field in the plane of the magnetic bubble material, and a conductor located at the leading, i.e., cutting, edge of the magnetic disk. Current in the conductor is used to assist the splitting operation whereby a new domain is split from the stretched seed domain. The conductor includes a first portion having a relatively wide cross-section where most of the current flows through a highly conductive material, such as gold. In the area of the generator, the conductor is narrow and the current path is through the magnetic material comprising the disk. Use of the magnetic material as a conductor path reduces problems due to electromigration and the generator is particularly suitable for use in providing magnetic bubble domains having diameters 2 microns and less.

公开(公告)号：CH597672A5

公开(公告)日：1978-04-14

申请号：CH682876

申请日：1976-06-01

Applicant: IBM

Inventor： KRYDER MARK HOWARD

IPC: G11C11/14 ,  G11C19/08 ,  H01F10/06 ,  G11C11/155

Abstract: A nucleator for producing reverse magnetized domains in an amorphous magnetic material capable of supporting such domains. The nucleator is comprised of a current carrying conductor whose current carrying path includes a portion of the amorphous magnetic medium. The amount of current which flows through the conductor and through the amorphous medium is sufficient to nucleate magnetic domains therein. The nucleator can be fabricated as a portion of magnetic elements used to move bubble domains in an amorphous magnetic material and can be implemented using single level metallurgy. Thus, a current conducting nucleator is provided in which current flows through the bubble material itself.

公开(公告)号：DE2653506A1

公开(公告)日：1977-07-07

申请号：DE2653506

申请日：1976-11-25

Applicant: IBM

Inventor： KRYDER MARK HOWARD

IPC: G11C11/14 ,  G01R33/07 ,  G01R33/09 ,  G11C19/08 ,  H01F10/00

Abstract: An improved thick film sensor for detection of magnetic bubble domains which can be configured to provide soft error detection and full data rate sensing. The sensor can be fabricated using single level masking techniques and is typically a magnetoresistive sensor comprised of NiFe. In its basic configuration, the sensor is comprised of two sets of magnetoresistive elements, each set including a sensor element and a dummy element, where both the sensor element and the dummy element provide a signal due to the bubble domain to be sensed. The magnetoresistive elements are arranged in a bridge circuit to give full data rate sensing and soft error detection. In a preferred embodiment, chevron expander-detectors are used, although the geometry of the sensor and dummy elements is not limited to chevron-type geometries.

公开(公告)号：DE2966227D1

公开(公告)日：1983-11-03

申请号：DE2966227

申请日：1979-10-12

Applicant: IBM

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

IPC: G11C11/14 ,  G11C19/08

公开(公告)号：DE2625112A1

公开(公告)日：1977-01-27

申请号：DE2625112

申请日：1976-06-04

Applicant: IBM

Inventor： KRYDER MARK HOWARD

IPC: G11C11/14 ,  G11C19/08 ,  H01F10/06 ,  H01F10/00

Abstract: A nucleator for producing reverse magnetized domains in an amorphous magnetic material capable of supporting such domains. The nucleator is comprised of a current carrying conductor whose current carrying path includes a portion of the amorphous magnetic medium. The amount of current which flows through the conductor and through the amorphous medium is sufficient to nucleate magnetic domains therein. The nucleator can be fabricated as a portion of magnetic elements used to move bubble domains in an amorphous magnetic material and can be implemented using single level metallurgy. Thus, a current conducting nucleator is provided in which current flows through the bubble material itself.