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公开(公告)号：CA1056502A
公开(公告)日：1979-06-12
申请号：CA201980
申请日：1974-06-07
Applicant: IBM
Inventor： BAJOREK CHRISTOPHER H , THOMPSON DAVID A
Abstract: Elimination of crosstalk in an integrated array of magnetoresistive reading heads by the use of regions of high coercivity material between the active areas of closely spaced magnetoresistive sensors so as to prevent flux coupling between such closely spaced sensors.
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公开(公告)号：FR2395580A1
公开(公告)日：1979-01-19
申请号：FR7816945
申请日：1978-05-29
Applicant: IBM
Inventor： HEMPSTEAD ROBERT D , KRONGELB SOL , NEPELA DANIEL A , THOMPSON DAVID A , VALSTYN ERICH P
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公开(公告)号：CA943665A
公开(公告)日：1974-03-12
申请号：CA154654
申请日：1972-10-24
Applicant: IBM
Inventor： ALMASI GEORGE S , KEEFE GEORGE E , LIN YEONG S , THOMPSON DAVID A
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.
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公开(公告)号：AT192260T
公开(公告)日：2000-05-15
申请号：AT97307860
申请日：1994-02-16
Applicant: IBM
Inventor： BAJOREK CHRISTOPHER H , FONTANA ROBERT E , SNYDER CLINT D , THOMPSON DAVID A , WILLIAMS MASON L , YEACK-SCRANTON CELIA E
IPC: G11B5/10 , G11B5/127 , G11B5/255 , G11B5/31 , G11B5/39 , G11B5/48 , G11B5/49 , G11B17/32 , G11B5/105 , G11B15/64 , G11B5/40
Abstract: A magnetic transducer and suspension assembly suitable for use in both contact recording and in winchester-type applications is described. A generally rectangular elongated flat suspension member includes a vertical-type inductive read/write transducer formed integrally with the suspension member and is embedded in one end of the suspension member. The vertical inductive transducer is suitable for vertical recording applications. The transducer vertical magnetic pole tip and magnetic yoke structure are formed at one end of the suspension member with the vertical pole tip extending to and exposed at an air bearing surface formed on the lower surface of a slider-shaped protrusion extending from the lower surface of the end of the suspension member. The integral transducer/suspension assembly can be adapted for either flying above the recording media or for use in continuous contact with the recording media. The air bearing surface is formed on the lower surface of a wear pad. The fabrication of the transducer/suspension assembly is adapted to be performed at the wafer level.
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公开(公告)号：CA2110135C
公开(公告)日：1998-09-15
申请号：CA2110135
申请日：1993-11-26
Applicant: IBM
Inventor： BAJOREK CHRISTOPHER H , FONTANA ROBERT E , SNYDER CLINT D , THOMPSON DAVID A , WILLIAMS MASON L , YEACK-SCRANTON CELIA E
Abstract: An integral combination magnetic transducer and suspension assembly suitable for use in both contact recording and in winchester-type applications is described. A generally rectangular elongated flat suspension member includes a vertical-type inductive read/write transducer formed integrally with the suspension member and is embedded in one end of the suspension member. The vertical inductive transducer is suitable for vertical recording applications. The transducer vertical magnetic pole tip and magnetic yoke structure are formed at one end of the suspension member with the vertical pole tip extending to and exposed at an air bearing surface formed on the lower surface of a slider-shaped protrusion extending from the lower surface of the end of the suspension member. The integral transducer/suspension assembly can be adapted for either flying above the recording media or for use in continuous contact with the recording media. The air bearing surface is formed on the lower surface of a wear pad. The fabrication of the transducer/suspension assembly is adapted to be performed at the wafer level.
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Patent Agency Ranking
公开(公告)号：CA1111969A
公开(公告)日：1981-11-03
申请号：CA309350
申请日：1978-08-15
Applicant: IBM
Inventor： THOMPSON DAVID A
Abstract: BISTABLE MAGNETOSTRICTIVE DEVICE AND METHODS OF MANUFACTURE A device includes a core, such as a wire or cylinder of a solid material such as nonmagnetic metal, coated with a film of a material having a high degree of magnetostriction and a uniaxial helical magnetic anisotropy at an oblique angle to the longitudinal axis of the core. The device has the characteristic of being magnetically bistable and of providing a large magnetic pulse as it changes to one of its stable states in response to passage of a magnetic field by it. To achieve a helical magnetic anisotropy, the magnetostrictive film can be applied to a nonmagnetic wire by plating the wire while it is under torsion, twisting a plated wire after plating, or by applying an electric current and a magnetic field to the wire as the film is being plated or annealed.
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公开(公告)号：FR2354663A1
公开(公告)日：1978-01-06
申请号：FR7713457
申请日：1977-04-26
Applicant: IBM
Inventor： FRANASZEK PETER A , THOMPSON DAVID A
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公开(公告)号：CA1009749A
公开(公告)日：1977-05-03
申请号：CA186207
申请日：1973-11-20
Applicant: IBM
Inventor： BAJOREK CHRISTOPHER H , ROMANKIW LUBOMYR T , THOMPSON DAVID A
Abstract: 1450204 Magnetic heads INTER. NATIONAL BUSINESS MACHINES CORP 9 Nov 1973 [29 Dec 1972] 52064/73 Heading G5R [Also in Division H3] A magnetic sensing head comprises a unitary structure of a layer of magneto-resistive material 16 for sensing a magnetic field and an adjacent biasing layer 14 of permantly magnetized material to bias the layer 16 magnetically to a required operating range, layers 14 and 16 being in direct contact with one another. The layers 14 and 16 may be co-planar or laminated, with the direction of magnetization, arrow M h , of bias layer 14 parallel or perpendicular to the easy axis and sense current direction, arrow I, of layer 16. Layer 16 is of permalloy material, e.g. Ni-Fe, Ni-Co or Ni-Fe-Co, and the bias layer 14 may be of ferrite. Layers 14,16, may be evaporated, sputtered or electroplated on a substrate 12 with thicknesses of 200 to 2000 and 50 to 400 Šngstroms respectively. The bias may be established due to exchange or epitaxially coupled layers 14, 16, there being direct atomic contact between the layers. In another form the biasing layer 14 is a composite layer comprising exchange or epitaxially coupled films with a magnetically soft film atomically coupled to a magnetically hard film, e.g. Ni-Fe deposited on a Fe 2 O 3 , a Fe 2 O 3 on Ni-Fe, Co or Co-rich Ni-Co on vanadium or chromium, or binary Co-P. In a further form, the bias layer, or two bias layers with the sensing layer therebetween, is or are formed by preferentially oxiding one or both surfaces of a permalloy sensor strip. Alternatively such surfaces may have localized zones with a raised coercivity produced by chemical reaction with chlorides or sulphates, etching to roughen the surfaces, or by selective deposition of materials which exchange couple to the sensing layer. The combined sensing and bias layers may be surrounded by a magnetic shield (8) in a record head, Fig. 1 (not shown). The head may be used for reading tapes, discs, magnetic ink, or sheets capable of generating and transporting magnetic bubble domains.
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公开(公告)号：FR2298845A1
公开(公告)日：1976-08-20
申请号：FR7540377
申请日：1975-12-23
Applicant: IBM
Inventor： ROMANKIW LUBOMYR T , SLUSARCZUK MARKO M G , THOMPSON DAVID A
IPC: G11C11/08 , G02F1/09 , G02F1/167 , G09F9/37 , G11C19/02 , G11C19/08 , G09F13/24 , G09X , G11C11/14
Abstract: A magnetizable fluid which serves as a display liquid and which includes a suspension of colloidal magnetic particles is used in a display device. The magnetic fluid is opaque to provide optical contrast. A host liquid is substantially immiscible with the display liquid. The display liquid is carried in a reservoir section which is distributed about the periphery of a display field in the reservoir. Each propagation line of the display field is provided with a bubble generator, which passes bubbles by the input end of each line. A bubble switch coil draws selected bubbles across a gap to reach the associated propagation line in response to a signal impressed on the coil. A uniform rotating magnetic field is provided by a permanent magnet beneath the display or by orthogonal magnetic coils.
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公开(公告)号：AT171297T
公开(公告)日：1998-10-15
申请号：AT94301109
申请日：1994-02-16
Applicant: IBM
Inventor： BAJOREK CHRISTOPER H , FONTANA ROBERT E , SNYDER CLINT D , THOMPSON DAVID A , WILLIAMS MASON L , YEACK-SCRANTON CELIA E
IPC: G11B5/10 , G11B5/127 , G11B5/255 , G11B5/31 , G11B5/39 , G11B5/48 , G11B5/49 , G11B17/32 , G11B5/105 , G11B15/64
Abstract: A magnetic transducer and suspension assembly suitable for use in both contact recording and in winchester-type applications is described. A generally rectangular elongated flat suspension member includes a vertical-type inductive read/write transducer formed integrally with the suspension member and is embedded in one end of the suspension member. The vertical inductive transducer is suitable for vertical recording applications. The transducer vertical magnetic pole tip and magnetic yoke structure are formed at one end of the suspension member with the vertical pole tip extending to and exposed at an air bearing surface formed on the lower surface of a slider-shaped protrusion extending from the lower surface of the end of the suspension member. The integral transducer/suspension assembly can be adapted for either flying above the recording media or for use in continuous contact with the recording media. The air bearing surface is formed on the lower surface of a wear pad. The fabrication of the transducer/suspension assembly is adapted to be performed at the wafer level.
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