公开(公告)号：US06280813B1

公开(公告)日：2001-08-28

申请号：US09416364

申请日：1999-10-08

申请人： Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Hal Jervis Rosen ,  Manfred Ernst Schabes

发明人： Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Hal Jervis Rosen ,  Manfred Ernst Schabes

IPC分类号： B32B302

CPC分类号： C23C28/021 ,  C23C28/00 ,  C23C28/023 ,  C23C28/42 ,  G11B5/66

摘要： 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.

摘要翻译： 用于数据存储的磁记录介质使用具有至少两个铁磁膜的磁记录层，其通过非铁磁间隔膜反铁磁耦合在一起。 两个反铁磁耦​​合薄膜的磁矩定向反平行，因此记录层的净残磁强度 - 厚度积（Mrt）是两个铁磁膜的Mrt值之差。 由于反铁磁耦合膜中的晶粒的体积增加，所以Mrt的这种减少是在记录介质的热稳定性降低的情况下完成的。 在磁记录刚性盘应用中，磁性层包括两个铁磁膜，每个是由溅射沉积的CoPtCrB合金的粒状膜，由具有厚度的Ru隔离膜隔开，以使两个CoPtCrB膜之间的反铁磁交换耦合最大化。 其中一个铁磁膜比另一个更厚，但是选择厚度使得零施加磁场的净力矩低，但非零。

公开(公告)号：US06594100B2

公开(公告)日：2003-07-15

申请号：US09903959

申请日：2001-07-11

申请人： Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Hal Jervis Rosen ,  Manfred Ernst Schabes

发明人： Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Hal Jervis Rosen ,  Manfred Ernst Schabes

IPC分类号： G11B503

CPC分类号： C23C28/021 ,  C23C28/00 ,  C23C28/023 ,  C23C28/42 ,  G11B5/66

摘要： A method for writing data on a magnetic recording medium includes providing a magnetic recording layer having at least two ferromagnetic films antiferromagnetically coupled together across a nonferromagnetic spacer film, with one of the ferromagnetic films having a greater magnetic moment than the other. A positive write field is applied to a first region to align the moments of both ferromagnetic films with the positive field, and then a negative write field is applied to an adjacent region to align the moments of both ferromagnetic films with the negative field. When the medium is moved away from the write fields, the moment of the ferromagnetic film with the lesser moment in each region flips to be antiparallel to the moment of the other ferromagnetic film in its region. The result is that the adjacent regions become adjacent magnetized domains with the transition between the domains representative of the written data.

摘要翻译： 一种在磁记录介质上写入数据的方法包括提供具有至少两个铁磁膜的磁记录层，所述至少两个铁磁膜在非铁磁隔离膜上反铁磁耦合在一起，其中一个铁磁膜具有比另一个更大的磁矩。 将正写入场施加到第一区域以将两个铁磁膜的力矩与正场对准，然后将负写入场施加到相邻区域以将两个铁磁膜的力矩与负场对准。 当介质从写入场移动时，每个区域中具有较小力矩的铁磁膜的力矩翻转成与其区域中的另一个铁磁膜的时刻反平行。 结果是相邻区域变成相邻的磁化域，其中代表写入数据的域之间的转变。

公开(公告)号：US06992866B2

公开(公告)日：2006-01-31

申请号：US10931315

申请日：2004-08-31

申请人： Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Thai Le ,  Stefan Maat ,  Philip Milton Rice

发明人： Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Thai Le ,  Stefan Maat ,  Philip Milton Rice

IPC分类号： G11B5/39

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G01R33/093 ,  G11B5/012 ,  G11B5/3903 ,  G11B5/3967 ,  H01F10/3277

摘要： An exchange-coupled magnetic structure includes a ferromagnetic layer, a coercive ferrite layer, such as cobalt-ferrite, for biasing the magnetization of the ferromagnetic layer, and an oxide underlayer, such as cobalt-oxide, in proximity to the coercive ferrite layer. The oxide underlayer has a lattice structure of either rock salt or a spinel and exhibits no magnetic moment at room temperature. The underlayer affects the structure of the coercive ferrite layer and therefore its magnetic properties, providing increased coercivity and enhanced thermal stability. As a result, the coercive ferrite layer is thermally stable at much smaller thicknesses than without the underlayer. The exchange-coupled structure is used in spin valve and magnetic tunnel junction magnetoresistive sensors in read heads of magnetic disk drive systems. Because the coercive ferrite layer can be made as thin as 1 nm while remaining thermally stable, the sensor satisfies the narrow gap requirements of high recording density systems.

摘要翻译： 交换耦合磁性结构包括强磁性层，用于偏置铁磁性层的磁化的钴铁氧体的矫顽铁氧体层以及邻近矫顽铁氧体层的氧化钴底层，例如氧化钴。 氧化物底层具有岩盐或尖晶石的晶格结构，并且在室温下不显示磁矩。 底层影响矫顽铁氧体层的结构，因此影响其磁特性，提供增强的矫顽力和增强的热稳定性。 结果，矫顽铁氧体层的热稳定性比没有底层要小得多的厚度。 交换耦合结构用于磁盘驱动系统读磁头中的自旋阀和磁隧道结磁阻传感器。 由于矫顽铁氧体层可以制成1nm的薄而保持热稳定性，所以传感器满足高记录密度系统的窄间隙要求。

公开(公告)号：US06836392B2

公开(公告)日：2004-12-28

申请号：US09841942

申请日：2001-04-24

申请人： Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Thai Le ,  Stefan Maat ,  Philip Milton Rice

发明人： Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Thai Le ,  Stefan Maat ,  Philip Milton Rice

IPC分类号： G11B539

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G01R33/093 ,  G11B5/012 ,  G11B5/3903 ,  G11B5/3967 ,  H01F10/3277

摘要： An exchange-coupled magnetic structure includes a ferromagnetic layer, a coercive ferrite layer, such as cobalt-ferrite, for biasing the magnetization of the ferromagnetic layer, and an oxide underlayer, such as cobalt-oxide, in proximity to the coercive ferrite layer. The oxide underlayer has a lattice structure of either rock salt or a spinel and exhibits no magnetic moment at room temperature. The underlayer affects the structure of the coercive ferrite layer and therefore its magnetic properties, providing increased coercivity and enhanced thermal stability. As a result, the coercive ferrite layer is thermally stable at much smaller thicknesses than without the underlayer. The exchange-coupled structure is used in spin valve and magnetic tunnel junction magnetoresistive sensors in read heads of magnetic disk drive systems. Because the coercive ferrite layer can be made as thin as 1 nm while remaining thermally stable, the sensor satisfies the narrow gap requirements of high recording density systems.

摘要翻译： 交换耦合磁性结构包括强磁性层，用于偏置铁磁性层的磁化的钴铁氧体的矫顽铁氧体层以及邻近矫顽铁氧体层的氧化钴底层，例如氧化钴。 氧化物底层具有岩盐或尖晶石的晶格结构，并且在室温下不显示磁矩。 底层影响矫顽铁氧体层的结构，因此影响其磁特性，提供增强的矫顽力和增强的热稳定性。 结果，矫顽铁氧体层的热稳定性比没有底层要小得多的厚度。 交换耦合结构用于磁盘驱动系统读磁头中的自旋阀和磁隧道结磁阻传感器。 由于矫顽铁氧体层可以制成1nm的薄而保持热稳定性，所以传感器满足高记录密度系统的窄间隙要求。

公开(公告)号：US07116532B2

公开(公告)日：2006-10-03

申请号：US10985195

申请日：2004-11-09

申请人： Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Thai Le ,  Stefan Maat ,  Philip Milton Rice

发明人： Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Thai Le ,  Stefan Maat ,  Philip Milton Rice

IPC分类号： G11B5/39

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G01R33/093 ,  G11B5/012 ,  G11B5/3903 ,  G11B5/3967 ,  H01F10/3277

摘要： An exchange-coupled magnetic structure includes a ferromagnetic layer, a coercive ferrite layer, such as cobalt-ferrite, for biasing the magnetization of the ferromagnetic layer, and an oxide underlayer, such as cobalt-oxide, in proximity to the coercive ferrite layer. The oxide underlayer has a lattice structure of either rock salt or a spinel and exhibits no magnetic moment at room temperature. The underlayer affects the structure of the coercive ferrite layer and therefore its magnetic properties, providing increased coercivity and enhanced thermal stability. As a result, the coercive ferrite layer is thermally stable at much smaller thicknesses than without the underlayer. The exchange-coupled structure is used in spin valve and magnetic tunnel junction magnetoresistive sensors in read heads of magnetic disk drive systems. Because the coercive ferrite layer can be made as thin as 1 nm while remaining thermally stable, the sensor satisfies the narrow gap requirements of high recording density systems.

公开(公告)号：US06773834B2

公开(公告)日：2004-08-10

申请号：US10059527

申请日：2002-01-29

申请人： Hoa Van Do ,  Eric Edward Fullerton ,  David Thomas Margulies ,  Hal Jervis Rosen

发明人： Hoa Van Do ,  Eric Edward Fullerton ,  David Thomas Margulies ,  Hal Jervis Rosen

IPC分类号： G11B566

CPC分类号： C23C28/021 ,  C23C28/023 ,  C23C28/42 ,  C23C28/44 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/265

摘要： A laminated magnetic recording medium for data storage has an antiferromagnetically-coupled (AFC) layer and a single ferromagnetic layer spaced apart by a nonferromagnetic spacer layer. The 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. In each of the two remanent magnetic states, the magnetic moments of the two antiferromagnetically-coupled films in the AFC layer are oriented antiparallel, and the magnetic moment of the single ferromagnetic layer and the greater-moment ferromagnetic film of the AFC layer are oriented parallel. The nonferromagnetic spacer layer between the AFC layer and the single ferromagnetic layer has a composition and thickness to prevent antiferromagnetic exchange coupling. The laminated medium has improved thermal stability and reduced intrinsic media noise.

摘要翻译： 用于数据存储的叠层磁记录介质具有反铁磁耦合（AFC）层和由非铁磁隔离层隔开的单个铁磁层。 AFC层由反铁磁耦合膜反铁磁耦合在一起的两个铁磁膜形成，其具有组成和厚度以诱导反铁磁耦合。 在两个剩余磁状态中的每一个中，AFC层中的两个反铁磁耦​​合膜的磁矩取向反平行，并且单个铁磁层的磁矩和AFC层的较大时刻铁磁膜的取向平行 。 AFC层和单个铁磁层之间的非铁磁间隔层具有防铁磁交换耦合的组成和厚度。 层压介质具有改善的热稳定性和降低的本征介质噪声。

公开(公告)号：US06372330B1

公开(公告)日：2002-04-16

申请号：US09626097

申请日：2000-07-26

申请人： Hoa Van Do ,  Eric Edward Fullerton ,  David Thomas Margulies ,  Hal Jervis Rosen

发明人： Hoa Van Do ,  Eric Edward Fullerton ,  David Thomas Margulies ,  Hal Jervis Rosen

IPC分类号： G11B566

CPC分类号： C23C28/021 ,  C23C28/023 ,  C23C28/42 ,  G11B5/66 ,  Y10T428/24942 ,  Y10T428/2495

摘要： 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.

摘要翻译： 用于数据存储的叠层磁记录介质使用具有至少两个由非铁磁隔离层隔开的反铁磁耦合（AFC）层的磁记录层。 每个AFC层形成为两个铁磁膜，其通过具有组成和厚度的反铁磁耦合膜反铁磁耦合在一起，以诱导第二膜与第一膜的反铁磁耦合。 每个AFC层中的两个反铁磁耦​​合膜的磁矩定向反平行，因此每个AFC层的净残磁强度 - 厚度积（Mrt）是两个铁磁膜的Mrt值之差。 相邻AFC层之间的非铁磁间隔层具有防止一个AFC层的铁磁膜与相邻AFC层的铁磁膜的任何反铁磁耦合的组成和厚度。

公开(公告)号：US06383668B1

公开(公告)日：2002-05-07

申请号：US09536868

申请日：2000-03-27

申请人： Eric Edward Fullerton ,  David Thomas Margulies ,  Ernesto Esteban Marinero ,  Manfred Ernst Schabes

发明人： Eric Edward Fullerton ,  David Thomas Margulies ,  Ernesto Esteban Marinero ,  Manfred Ernst Schabes

IPC分类号： G11B566

CPC分类号： G11B5/66 ,  Y10S428/90

摘要： 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.

摘要翻译： 磁记录盘具有形成在特殊多层“主体”层上的磁记录层。 主体层是“合成的反铁磁性”，即至少两个铁磁膜，其通过非铁磁隔离膜彼此交互耦合反铁磁（AF），使得它们的磁矩反向取向。 磁记录层与主体层中的顶部铁磁膜具有不同的组成，并与主体层的顶部铁磁膜铁磁耦合。 确定热稳定性的复合结构（磁记录层和主体层）的磁体积V将近似为磁记录层中的晶粒的体积和主体层的AF耦合铁磁性膜之和。 然而，复合结构的磁矩主要仅在磁记录层的时刻，因为主体层被设计成基本上没有净磁矩。

公开(公告)号：US06723450B2

公开(公告)日：2004-04-20

申请号：US10103186

申请日：2002-03-19

申请人： Hoa Van Do ,  Mary F. Doerner ,  Eric Edward Fullerton ,  David Thomas Margulies ,  William G. McChesney ,  Manfred Ernst Schabes ,  Kai Tang

发明人： Hoa Van Do ,  Mary F. Doerner ,  Eric Edward Fullerton ,  David Thomas Margulies ,  William G. McChesney ,  Manfred Ernst Schabes ,  Kai Tang

IPC分类号： G11B566

CPC分类号： G11B5/66 ,  G11B5/82 ,  Y10T428/12646 ,  Y10T428/12854 ,  Y10T428/12861 ,  Y10T428/12868 ,  Y10T428/12889 ,  Y10T428/12896 ,  Y10T428/24967

摘要： A magnetic recording medium for data storage uses a magnetic recording layer having at least two ferromagnetic films with different remanent magnetization-thickness (Mrt) values that are coupled antiparallel across a nonferromagnetic spacer film predominantly by the dipole field (Hd) from the grains of the higher-Mrt ferromagnetic film. The material compositions and thicknesses of the ferromagnetic films and the nonferromagnetic spacer film are selected so that Hd predominates over any antiferromagnetic exchange coupling field (Haf) and is greater than the coercive field of the lower-Mrt ferromagnetic film. As a result, the magnetizations of the two ferromagnetic films are antiparallel in the two remanent magnetic states, 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.

摘要翻译： 用于数据存储的磁记录介质使用具有至少两个铁磁膜的磁记录层，所述至少两个铁磁膜具有不同的剩余磁化厚度（Mrt）值，其主要由偶极场（Hd）与非磁性间隔膜 较高的Mrt铁磁膜。 选择铁磁膜和非铁磁隔离膜的材料组成和厚度，使得Hd优于任何反铁磁交换耦合场（Haf），并且大于下部Mrt铁磁膜的矫顽场。 结果，两个铁磁膜的磁化在两个剩余磁状态下是反平行的，因此记录层的净残磁强度 - 厚度乘积（Mrt）是两个铁磁膜的Mrt值之差。

公开(公告)号：US06440589B1

公开(公告)日：2002-08-27

申请号：US09324606

申请日：1999-06-02

申请人： Eric Edward Fullerton ,  David Thomas Margulies ,  Ernesto Esteban Marinero ,  Manfred Ernst Schabes

发明人： Eric Edward Fullerton ,  David Thomas Margulies ,  Ernesto Esteban Marinero ,  Manfred Ernst Schabes

IPC分类号： G11B566

CPC分类号： G11B5/66 ,  G11B5/746 ,  Y10S428/90 ,  Y10T428/24942 ,  Y10T428/265

摘要： 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.

摘要翻译： 磁记录盘具有磁记录层，该磁记录层包括铁磁性主体层和直接沉积在主体层上的铁磁覆层，其有效覆盖厚度在1-40埃的范围内。 在覆盖层中使用的铁磁材料包含Co，Fe和/或Ni，并且具有显着大于铁磁性主体层中的材料的磁矩的磁矩。 铁磁覆盖层通过桥接磁耦合晶粒来改善主体层中所含的超顺磁性晶粒的热稳定性。 介质的增强的热稳定性允许使用更薄的铁磁性主体层，并且导致较低的剩余磁化 - 厚度乘积（Mrt）值和更高的记录密度。