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公开(公告)号：WO0173762A3
公开(公告)日：2002-04-04
申请号：PCT/GB0101180
申请日：2001-03-19
Inventor： FULLERTON ERIC EDWARD , MARGULIES DAVID THOMAS , MARINERO ERNESTO ESTEBAN , SCHABES MANFRED ERNST
CPC classification number: G11B5/66 , Y10S428/90
Abstract: A magnetic recording disk has a magnetic recording layer formed on a special multilayered "host" layer (30). The host layer comprises at least two ferromagnetic films (32, 34) that are exchange-coupled antiferromagnetically (AF) to one another across a nonferromagnetic spacer film so that their magnetic moments are oriented antiparallel. The magnetic recording layer (25) has a different composition from the top ferromagnetic film in the host layer and is ferromagnetically coupled to the top ferromagnetic film of the host layer.
Abstract translation: 磁记录盘具有形成在特殊的多层“主体”层（30）上的磁记录层。 主体层包括至少两个铁磁膜（32,34），其通过非铁磁隔离膜彼此交互耦合反铁磁（AF），使得它们的磁矩反平行取向。 磁记录层（25）与主体层中的顶部铁磁膜具有不同的组成，并且与主体层的顶部铁磁膜铁磁耦合。
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公开(公告)号：JP2001148110A
公开(公告)日：2001-05-29
申请号：JP2000307398
申请日：2000-10-06
Applicant: IBM
Inventor： CAREY MATTHEW JOSEPH , FULLERTON ERIC EDWARD , GURNEY BRUCE ALVIN , ROSEN HAL JERVIS , SCHABES MANFRED ERNST
IPC: G11B5/708 , C23C28/00 , C23C28/02 , G11B5/64 , G11B5/65 , G11B5/66 , G11B5/673 , G11B5/738 , H01F10/26
Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording medium for keeping good thermal stability and SNR and supporting ultra high-density recording. SOLUTION: This magnetic recording medium for a data storage device is constituted of at least two magnetic recording layers of ferromagnetic films, which are adhered to each other in an antiferromagnetic manner, while interposing a nonferromagnetic spacer film. Magnetic moment of one ferromagnetic film works in the direction antiparallel to that of the magnetic moment of the other ferromagnetic film. The balanced magnetic moment is shown as the difference between Mrt values of two ferromagnetic films, when the magnetic moment is shown by net product (Mrt) of residual magnetism (Mr) and thickness (t) in the magnetic recording layer. The decrease in Mrt is achieved, while the thermal stability of the recording medium is not deteriorated, because the volume of particles in ferromagnetic films adhered to each other in an antiferromagnetic manner is increased constructively. Very sharp magnetic transitions can be achieved by the reduced antimagnetic field and higher density of the bit lines can be obtained in this medium as a result.
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公开(公告)号：JP2001023144A
公开(公告)日：2001-01-26
申请号：JP2000159518
申请日：2000-05-30
Applicant: IBM
Inventor： FULLERTON ERIC EDWARD , MARGULIES DAVID THOMAS , MARINERO ERNESTO ESTEBAN , MANFRED ERNST SHABESU
IPC: G11B5/64 , G11B5/65 , G11B5/66 , G11B5/73 , G11B5/738 , G11B5/851 , H01F10/14 , H01F10/16 , H01F10/28 , H01F10/30 , H01F41/16 , H01F41/32
Abstract: PROBLEM TO BE SOLVED: To obtain a magnetic recording medium comprising a thin magnetic layer having a high coersive force, a high squareness ratio and a low product (Mrt) of a low residual magnetization and thickness to realize a writing operation keeping the thermally stable and extremely high recording density. SOLUTION: This magnetic recording medium comprises a magnetic recording layer having a ferro-magnetic host layer 15 and a ferro-magnetic overlay 17 which is attached in direct on the host layer 15 and has an effective thickness in the range of 1 to 40 Å. The ferro-magnetic overlay material includes Co, Fe or Ni or combination of these materials and also has a magnetic moment which is larger than that of the ferro-magnetic host layer 15. The ferro-magnetic overlay 17 improves thermal stability through magnetic coupling of ferro-magnetic host particles having small bridging. When the thermal stability of a medium increases, use of a thinner ferro-magnetic host layer 15 can be realized and thereby a higher recording density can be obtained from the product (Mrt) of smaller residual magnetization and thickness.
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公开(公告)号：CA2398950A1
公开(公告)日：2001-10-04
申请号：CA2398950
申请日：2001-03-19
Applicant: IBM
Inventor： FULLERTON ERIC EDWARD , MARGULIES DAVID THOMAS , MARINERO ERNESTO ESTEBAN , SCHABES MANFRED ERNST
Abstract: A magnetic recording disk has a magnetic recording layer formed on a special multilayered "host" layer (30). The host layer comprises at least two ferromagnetic films (32, 34) that are exchange-coupled antiferromagnetically (AF) to one another across a nonferromagnetic spacer film so that their magnetic moments are oriented antiparallel. The magnetic recording layer (25 ) has a different composition from the top ferromagnetic film in the host laye r and is ferromagnetically coupled to the top ferromagnetic film of the host layer.
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公开(公告)号：GB2355018B
公开(公告)日：2004-02-11
申请号：GB0015023
申请日：2000-06-21
Applicant: IBM
Inventor： CAREY MATTHEW JOSEPH , FULLERTON ERIC EDWARD , GURNEY BRUCE ALVIN , ROSEN HAL JERVIS , SCHABES MANFRED ERNST
IPC: G11B5/708 , C23C28/00 , C23C28/02 , G11B5/64 , G11B5/65 , G11B5/66 , G11B5/673 , G11B5/738 , H01F10/26 , C23C14/14 , C23C14/16 , G11B5/62 , G11B5/84
Abstract: A magnetic recording medium for data storage uses a magnetic recording layer having at least two ferromagnetic films antiferromagnetically coupled together across a nonferromagnetic spacer film. The magnetic moments of the two antiferromagnetically-coupled films are oriented antiparallel, and thus the net remanent magnetization-thickness product (Mrt) of the recording layer is the difference in the Mrt values of the two ferromagnetic films. This reduction in Mrt is accomplished without a reduction in the thermal stability of the recording medium because the volumes of the grains in the antiferromagnetically-coupled films add constructively. In a magnetic recording rigid disk application, the magnetic layer comprises two ferromagnetic films, each a granular film of a sputter deposited CoPtCrB alloy, separated by a Ru spacer film having a thickness to maximize the antiferromagnetic exchange coupling between the two CoPtCrB films. One of the ferromagnetic films is made thicker than the other, but the thicknesses are chosen so that the net moment in zero applied magnetic field is low, but nonzero.
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Patent Agency Ranking
公开(公告)号：GB2355018A
公开(公告)日：2001-04-11
申请号：GB0015023
申请日：2000-06-21
Applicant: IBM
Inventor： CAREY MATTHEW JOSEPH , FULLERTON ERIC EDWARD , GURNEY BRUCE ALVIN , ROSEN HAL JERVIS , SCHABES MANFRED ERNST
IPC: G11B5/708 , C23C28/00 , C23C28/02 , G11B5/64 , G11B5/65 , G11B5/66 , G11B5/673 , G11B5/738 , H01F10/26 , C23C14/14 , C23C14/16 , G11B5/62 , G11B5/84
Abstract: A magnetic recording medium for data storage uses a magnetic recording layer having at least two ferromagnetic films antiferromagnetically coupled together across a nonferromagnetic spacer film. The magnetic moments of the two antiferromagnetically-coupled films are oriented antiparallel, and thus the net remanent magnetisation-thickness product (Mrt) of the recording layer is the difference in the Mrt values of the two ferromagnetic films. This reduction in Mrt is accomplished without a reduction in the thermal stability of the recording medium because the volumes of the grains in the antiferromagnetically-coupled films add constructively. In a magnetic recording rigid disk application, the magnetic layer comprises two ferromagnetic films, each a granular film of a sputter deposited coPtCrB alloy, separated by a Ru spacer film having a thickness to maximise the antiferromagnetic exchange coupling between the two CoPtCrB films. One of the ferromagnetic films is made thicker than the other, but the thicknesses are chosen so that the net moment in zero applied magnetic field is low, but nonzero. In general the first and second ferromagnetic films are made of a material selected from Co, Fe, Ni and their alloys. Apart from ruthenium the spacer film may be formed of Cr, Rh, Ir, Cu and their alloys. The medium may be in the form of a disk which has an underlayer on the substrate and a protective overcoat formed on the magnetic recording layer.
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公开(公告)号：DE10026050A8
公开(公告)日：2004-09-02
申请号：DE10026050
申请日：2000-05-25
Applicant: IBM
Inventor： FULLERTON ERIC EDWARD , MARGULIES DAVID THOMAS , MARINERO ERNESTO ESTEBAN , SCHABES MANFRED ERND
IPC: G11B5/64 , G11B5/65 , G11B5/66 , G11B5/73 , G11B5/738 , G11B5/851 , H01F10/14 , H01F10/16 , H01F10/28 , H01F10/30 , H01F41/16 , H01F41/32 , G11B5/62
Abstract: A magnetic recording disk has a magnetic recording layer that includes a ferromagnetic host layer and a ferromagnetic overlay deposited directly on the host layer with an effective overlay thickness in the range of 1-40 Angstroms. The ferromagnetic material used in the overlay contains Co, Fe and/or Ni and has a magnetic moment significantly greater than that of the material in the ferromagnetic host layer. The ferromagnetic overlays improve the thermal stability of superparamagnetic grains contained within the host layers by magnetically coupling the grains through bridging. The enhanced thermal stability of the media allows for the use of thinner ferromagnetic host layers, and leads to lower remanent magnetization-thickness product (Mrt) values and higher recording densities.
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公开(公告)号：AU7265701A
公开(公告)日：2002-02-18
申请号：AU7265701
申请日：2001-07-23
Applicant: IBM
Inventor： FULLERTON ERIC EDWARD , MARGULIES DAVID THOMAS
Abstract: A magnetic recording medium for data storage uses a magnetic recording layer having at least two ferromagnetic films exchange coupled together antiferromagnetically across a nonferromagnetic spacer film. In this antiferromagnetically-coupled (AFC) recording layer the magnetic moments of the two ferromagnetic films are oriented antiparallel, and thus the net remanent magnetization-thickness product (Mrt) of the AFC recording layer is the difference in the Mrt values of the two ferromagnetic films. This reduction in Mrt is accomplished without a reduction in thermal stability of the recording medium. The lower ferromagnetic film in the AFC recording layer is a boron-free ferromagnetic CoCr alloy that does not require a nucleation layer between it and the Cr alloy underlayer. The ferromagnetic CoCr alloy has sufficient saturation magnetization (Ms) to produce excellent magnetic recording performance for the AFC recording layer, while also serving as a template or nucleation layer to induce the growth of the spacer layer and top ferromagnetic boron-containing ferromagnetic film.
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公开(公告)号：CA2392487A1
公开(公告)日：2001-12-27
申请号：CA2392487
申请日：2001-06-01
Applicant: IBM
Inventor： WELLER DIETER KLAUS , TERRIS BRUCE DAVID , FULLERTON ERIC EDWARD
Abstract: A magnetic recording disk is patterned into discrete magnetic and nonmagneti c regions with the magnetic regions serving as the magnetic recording data bit s. The magnetic recording layer (20) comprises two ferromagnetic films (22, 24) separated by a nonferromagnetic spacer film (26). The spacer film (26) material composition and thickness is selected such that the first and secon d ferromagnetic films (22, 24) are antiferromagnetically coupled across the spacer film (26). After this magnetic recording layer (20) has been formed o n the disk substrate (11), ions (62) are irradiated onto it through a patterne d mask (60). The ions disrupt the spacer film (62) and thereby destroy the antiferromagnetic coupling between the two ferromagnetic films (22, 24). As a result, in the regions (55) of the magnetic recording layer (20) that are io n- irradiated the first and second ferromagnetic films (22, 24) are essentially ferromagnetically coupled so that the magnetic moments from the ferromagneti c films (22, 24) are parallel and produce a magnetic moment that is essentiall y the sum of the moments from the two films (22, 24). In the non-irradiated regions (52, 54) of the magnetic recording layer (20), the first and second ferromagnetic films (22, 24) remain antiferromagnetically coupled so that their magnetic moments are oriented antiparallel. The composition and thicknesses of the first and second ferromagnetic films (22, 24) are selecte d such that essentially no magnetic field is detectable at a predetermined distance above the magnetic recording layer (20) corresponding to the height that the magnetic recording head would be located.
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公开(公告)号：AU6929901A
公开(公告)日：2002-02-05
申请号：AU6929901
申请日：2001-07-06
Applicant: IBM
Inventor： FULLERTON ERIC EDWARD , MARGULIES DAVID THOMAS , ROSEN HAL JERVIS
IPC: G11B5/65 , C23C28/00 , C23C28/02 , G11B5/64 , G11B5/66 , G11B5/673 , G11B5/708 , G11B5/738 , H01F10/26
Abstract: A laminated magnetic recording medium for data storage uses a magnetic recording layer having at least two antiferromagnetically-coupled (AFC) layers spaced apart by a nonferromagnetic spacer layer. Each AFC layer is formed as two ferromagnetic films antiferromagnetically coupled together across an antiferromagnetically coupling film that has a composition and thickness to induce antiferromagnetic coupling of the second film to the first film. The magnetic moments of the two antiferromagnetically-coupled films in each AFC layer are oriented antiparallel, and thus the net remanent magnetization-thickness product (Mrt) of each AFC layer is the difference in the Mrt values of the two ferromagnetic films. The nonferromagnetic spacer layer between neighboring AFC layers has a composition and thickness to prevent any antiferromagnetic coupling of the ferromagnetic films of one AFC layer with the ferromagnetic films of the neighboring AFC layer.
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