公开(公告)号：JPH107456A

公开(公告)日：1998-01-13

申请号：JP4760997

申请日：1997-03-03

Applicant: IBM

Inventor： BEYERS ROBERT B ,  ENGLER EDWARD M ,  GRANT PAUL M ,  LIM GRACE S ,  PARKIN STUART S P

IPC: C01G1/00 ,  C01G3/00 ,  C04B35/00 ,  C04B35/45 ,  H01B12/00 ,  H01B13/00 ,  H01L39/12 ,  H01L39/24

Abstract: PROBLEM TO BE SOLVED: To produce a superconductive material substantially manifesting a single phase bulk superconductivity at a temperature not less than 77 deg.K and to provide the method for producing the superconductive material. SOLUTION: This superconductive material has a perovskite crystal structure, is represented by A1 ±x M2 ±x Cu3 Oy [A is a combination of Y, Lu, Sc or Yb or Y; M is a combination of Ba, Sr or Ca or Ba; (x) is within the range of 0

公开(公告)号：CA1269894A

公开(公告)日：1990-06-05

申请号：CA532014

申请日：1987-03-13

Applicant: IBM

Inventor： AHLERT RICHARD H ,  HOWARD JAMES K ,  LIM GRACE S

IPC: G11B5/66 ,  G11B5/64 ,  G11B5/73 ,  G11B5/738 ,  G11B5/82 ,  G11B5/62 ,  H01F41/14 ,  H01F10/16

Abstract: An improved cobalt-platinum (CoPt) thin film metal alloy media for horizontal magnetic recording has a coercivity substantially greater than prior CoPt thin film metal alloy media. A tungsten underlayer between the substrate and the CoPt magnetic layer improves the coercivity above that of media with conventional underlayers, such as chromium. The coercivity of the CoPt layer can be increased even further if the CoPt film is deposited in such a manner as to form an intermetallic compound of Co3W in the interface region between the tungsten underlayer and the CoPt magnetic layer. The tungsten underlayer also improves the magnetic properties of the media when the magnetic layer is an alloy of cobalt-platinum-chromium (CoPtCr).

公开(公告)号：CA1341623C

公开(公告)日：2011-10-11

申请号：CA558109

申请日：1988-02-04

Applicant: IBM

Inventor： BEYERS ROBERT B ,  ENGLER EDWARD M ,  GRANT PAUL M ,  LIM GRACE S ,  PARKIN STUART S P

IPC: C01G1/00 ,  C01G3/00 ,  C04B35/00 ,  C04B35/45 ,  H01B12/00 ,  H01B13/00 ,  H01L39/12 ,  H01L39/24

Abstract: Compositions having the formula A1 x m 2 x Cu3Oy, wherein A is Y, or a combination of Y, La, Lu, Sc or Yb; M is Ba, or a combination of Ba, Sr or Ca and y is sufficient to satisfy the valence demands, have been found to be bulk electrical superconductors at a temperature above 77°K. The compositions are single phase perovskite-like crystalline structures. They are made by a process involving intimately mixing the metal oxides or their precursors in the proper molar ratios, heating the mixture in the presence of oxygen to a temperature between about 800°C and about 1100°C and slowly cooling the mixture to room temperature in the presence of oxygen over a period of at least four hours.

公开(公告)号：AU1278388A

公开(公告)日：1988-09-15

申请号：AU1278388

申请日：1988-03-08

Applicant: IBM

Inventor： BEYERS ROBERT B ,  ENGLER EDWARD M ,  GRANT PAUL M ,  LIM GRACE S ,  PARKIN STUART S P

IPC: C01G1/00 ,  C01G3/00 ,  C04B35/00 ,  C04B35/45 ,  H01B12/00 ,  H01B13/00 ,  H01L39/12 ,  H01L39/24 ,  C01G3/02 ,  C01G57/00

Abstract: Compositions having the formula A1+/-xM2+/-xCu3Oy, wherein A is Y, or a combination of Y La, Lu, Sc or Yb; M is Ba, or a combination of Ba, Sr or Ca and y is sufficient to satisfy the valence demands, have been found to be bulk electrical superconductors at a temperature above 77K. The compositions are single phase perovskite-like crystalline structures. They are made by a process involving intimately mixing the metal oxides or their precursors in the proper molar ratios, heating the mixture in the presence of oxygen to a temperature between about 800 DEG C and about 1100 DEG C and slowly cooling the mixture to room temperature in the presence of oxygen over a period of at least four hours.

公开(公告)号：MX167372B

公开(公告)日：1993-03-19

申请号：MX1054288

申请日：1988-02-24

Applicant: IBM

Inventor： LIM GRACE S ,  PARKIN STUART S P ,  BEYERS ROBERT B ,  ENGLER EDWARD M ,  GRANT PAUL M

IPC: C01G1/00 ,  C01G3/00 ,  C04B35/00 ,  C04B35/45 ,  H01B12/00 ,  H01B13/00 ,  H01L39/12 ,  H01L39/24 ,  H03B15/00

Abstract: Compositions having the formula A1+/-xM2+/-xCu3Oy, wherein A is Y, or a combination of Y La, Lu, Sc or Yb; M is Ba, or a combination of Ba, Sr or Ca and y is sufficient to satisfy the valence demands, have been found to be bulk electrical superconductors at a temperature above 77K. The compositions are single phase perovskite-like crystalline structures. They are made by a process involving intimately mixing the metal oxides or their precursors in the proper molar ratios, heating the mixture in the presence of oxygen to a temperature between about 800 DEG C and about 1100 DEG C and slowly cooling the mixture to room temperature in the presence of oxygen over a period of at least four hours.

公开(公告)号：AU601553B2

公开(公告)日：1990-09-13

申请号：AU1278388

申请日：1988-03-08

Applicant: IBM

Inventor： BEYERS ROBERT B ,  ENGLER EDWARD M ,  GRANT PAUL M ,  LIM GRACE S ,  PARKIN STUART S P

IPC: C01G1/00 ,  C01G3/00 ,  C04B35/00 ,  C04B35/45 ,  H01B12/00 ,  H01B13/00 ,  H01L39/12 ,  H01L39/24 ,  C01G3/02 ,  C01G57/00 ,  C04B35/50

Abstract: Compositions having the formula A1+/-xM2+/-xCu3Oy, wherein A is Y, or a combination of Y La, Lu, Sc or Yb; M is Ba, or a combination of Ba, Sr or Ca and y is sufficient to satisfy the valence demands, have been found to be bulk electrical superconductors at a temperature above 77K. The compositions are single phase perovskite-like crystalline structures. They are made by a process involving intimately mixing the metal oxides or their precursors in the proper molar ratios, heating the mixture in the presence of oxygen to a temperature between about 800 DEG C and about 1100 DEG C and slowly cooling the mixture to room temperature in the presence of oxygen over a period of at least four hours.

公开(公告)号：CA1269895A

公开(公告)日：1990-06-05

申请号：CA532016

申请日：1987-03-13

Applicant: IBM

Inventor： AHLERT RICHARD H ,  HOWARD JAMES K ,  LIM GRACE S

IPC: G11B5/66 ,  G11B5/64 ,  G11B5/65 ,  G11B5/706 ,  G11B5/73 ,  G11B5/738 ,  B32B15/00

Abstract: A vertical magnetic recording medium is formed of multiple layers, each layer comprising a cobalt-platinum (CoPt) magnetic film formed on a hexagonal-close-packed (HCP) nucleating film. The thickness of each CoPt film in each layer is sufficiently thin to assure that the film has perpendicular magnetic anisotropy. The magnetic properties of the multilayered magnetic film structure can be varied by varying the thicknesses of the individual films and the number of layers.