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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：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：AU4088001A
公开(公告)日：2001-10-08
申请号：AU4088001
申请日：2001-03-19
Applicant: IBM
Abstract: A magnetic recording disk has a magnetic recording layer formed on a special multilayered "host" layer. The host layer is a "synthetic antiferromagnetically", i.e., at least two ferromagnetic films 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 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. The magnetic volume V of the composite structure (magnetic recording layer and host layer) that determines the thermal stability will be approximately the sum of the volumes of the grains in the magnetic recording layer and the AF-coupled ferromagnetic films of the host layer. However, the magnetic moment of the composite structure is primarily just the moment from the magnetic recording layer because the host layer is designed to have essentially no net magnetic moment.
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Patent Agency Ranking
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：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：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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公开(公告)号：DE10026050A1
公开(公告)日：2000-12-28
申请号：DE10026050
申请日：2000-05-25
Applicant: IBM DEUTSCHLAND INFORMATIONSSY
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: Magnetic recording medium comprises a substrate (11), a support (13) on the substrate, a granular ferromagnetic base layer (15) made of a Co alloy on the support and having a thickness of 1-30 nm, and a ferromagnetic coating (17) formed on and in contact with the base layer and comprising an element selected from Co, Fe and Ni. The coating has an effective thickness of 1-40 angstroms. An Independent claim is also included for a process for the production of the recording medium.
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