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：US08263239B2

公开(公告)日：2012-09-11

申请号：US11475281

申请日：2006-06-26

申请人： Andreas Klaus Berger ,  Hoa Van Do ,  Eric Edward Fullerton ,  David Thomas Margulies ,  Natacha Frederique Supper

发明人： Andreas Klaus Berger ,  Hoa Van Do ,  Eric Edward Fullerton ,  David Thomas Margulies ,  Natacha Frederique Supper

IPC分类号： G11B5/66

CPC分类号： G11B5/66 ,  G11B5/84

摘要： A laminated magnetic recording structure for use in perpendicular or longitudinal recording is described. A small amount of ferromagnetic coupling is added between the two magnetic layers that are sufficiently decoupled to switch independently. In one embodiment the coupling is achieved by doping the spacer layer with a ferromagnetic material. Ruthenium (Ru), which is a preferred nonmagnetic material for spacer layers with cobalt (Co) being the preferred magnetic material. The weak ferromagnetic coupling can also be achieved through the use of platinum, palladium and alloys thereof for the spacer layer without the addition of a ferromagnetic element, but alternatively they can also be doped with ferromagnetic elements. For embodiments for perpendicular recording the spacer layer further can additionally comprise oxides of one or more elements selected from the group consisting of Si, Ta, Ti, Nb, Cr, V and B.

摘要翻译： 描述了用于垂直或纵向记录的层叠磁记录结构。 在两个磁性层之间添加少量铁磁耦合，这两个磁性层被充分地去耦以独立地开关。 在一个实施例中，通过用铁磁材料掺杂间隔层来实现耦合。 钌（Ru），其是用于具有钴（Co）的优选磁性材料的间隔层的优选非磁性材料。 弱铁磁耦合也可以通过使用铂，钯及其合金作为间隔层，而不添加铁磁性元件，但也可以掺杂铁磁元件。 对于垂直记录的实施例，间隔层还可另外包含选自Si，Ta，Ti，Nb，Cr，V和B中的一种或多种元素的氧化物。

公开(公告)号：US20080057349A1

公开(公告)日：2008-03-06

申请号：US11470310

申请日：2006-09-06

申请人： Andreas Klaus Berger ,  Hoa Van Do ,  Yoshihiro Ikeda ,  Byron Hassberg Lengsfield ,  Hal Jervis Rosen ,  Kentaro Takano ,  Min Xiao

发明人： Andreas Klaus Berger ,  Hoa Van Do ,  Yoshihiro Ikeda ,  Byron Hassberg Lengsfield ,  Hal Jervis Rosen ,  Kentaro Takano ,  Min Xiao

IPC分类号： G11B5/65

CPC分类号： G11B5/65 ,  G01R33/1207

摘要： A high performance perpendicular media with optimal exchange coupling between grains has improved thermal stability, writeability, and signal-to-noise ratio in a selected range of allowable intergranular exchange between the grains for high performing media. The writeability and byte error rate of a TaOx media are demonstrated to be substantially better than that of other designs.

摘要翻译： 具有晶粒之间的最佳交换耦合的高性能垂直介质在高性能介质的晶粒之间允许的晶间交换的选定范围内提高了热稳定性，可写性和信噪比。 证明了TaO x x介质的可写性和字节错误率显着优于其他设计。

公开(公告)号：US06721144B2

公开(公告)日：2004-04-13

申请号：US09755556

申请日：2001-01-04

申请人： Matthew Joseph Carey ,  Hoa Van Do ,  Robin Frederick Charles Farrow ,  Bruce Alvin Gurney ,  David Thomas Margulies ,  Ronald Franklin Marks ,  Philip Milton Rice ,  Ren Xu

发明人： Matthew Joseph Carey ,  Hoa Van Do ,  Robin Frederick Charles Farrow ,  Bruce Alvin Gurney ,  David Thomas Margulies ,  Ronald Franklin Marks ,  Philip Milton Rice ,  Ren Xu

IPC分类号： G11B539

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  B82Y40/00 ,  G01R33/093 ,  G11B5/012 ,  G11B5/3932 ,  G11B5/3967 ,  H01F10/3268 ,  H01F41/302 ,  Y10T29/49032 ,  Y10T29/49039 ,  Y10T29/49043 ,  Y10T29/49044 ,  Y10T29/49046 ,  Y10T29/49071

摘要： An exchange-coupled magnetic structure of a cobalt-ferrite layer adjacent a magnetic metal layer is used in magnetorestive sensors, such as spin valves or tunnel junction valves. The exchange-coupled magnetic structure is used in a pinning structure pinning the magnetization of a ferromagnetic pinned layer, or in an AP pinned layer. A low coercivity ferrite may be used in an AP free layer. Cobalt-ferrite layers may be formed by co-sputtering of Co and Fe in an oxygen/argon gas mixture, or by sputtering of a CoFe2 composition target in an oxygen/argon gas mixture. Alternatively, the cobalt-ferrite layer may be formed by evaporation of Co and Fe from an alloy source or separate sources along with a flux of oxygen atoms from a RF oxygen atom beam source. Magnetoresistive sensors including cobalt-ferrite layers have small read gaps and produce large signals with high efficiency.

摘要翻译： 邻近磁性金属层的钴铁氧体层的交换耦合磁性结构被用于诸如自旋阀或隧道结阀的磁力回转传感器中。 交换耦合磁结构用于钉扎铁磁钉扎层或AP钉扎层的磁化的钉扎结构。 低矫顽力铁氧体可用于AP自由层。 钴 - 铁氧体层可以通过在氧/氩气混合物中共同溅射Co和Fe，或者通过在氧/氩气混合物中溅射CoFe 2组合物靶来形成。 或者，钴 - 铁素体层可以通过从合金源蒸发Co和Fe以及来自RF氧原子束源的氧原子束的分离源来形成。 包括钴 - 铁氧体层的磁阻传感器具有小的读取间隙，并产生高效率的大信号。

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：US20130235490A1

公开(公告)日：2013-09-12

申请号：US13385860

申请日：2012-03-09

申请人： Hoa Van Do ,  Kentaro Takano ,  Qi-Fan Xiao ,  Chu Sy Tran

发明人： Hoa Van Do ,  Kentaro Takano ,  Qi-Fan Xiao ,  Chu Sy Tran

IPC分类号： G11B5/012 ,  G11B5/66 ,  G11B5/84

CPC分类号： G11B5/82 ,  G11B5/7379

摘要： An embodiment of the invention provides an apparatus that includes: a perpendicular magnetic recording medium including a substrate, a soft under layer above the substrate, a seed layer structure above the soft under layer, wherein the seed layer structure contains Ruthenium; and a magnetic recording layer above the seed layer structure.

摘要翻译： 本发明的一个实施例提供了一种装置，其包括：垂直磁记录介质，其包括基板，在所述基板上方的软下层，在所述软下层上方的晶种层结构，其中所述晶种层结构包含钌; 和种子层结构之上的磁记录层。

公开(公告)号：US07989096B2

公开(公告)日：2011-08-02

申请号：US12691603

申请日：2010-01-21

申请人： Andreas Berger ,  Eric Edward Fullerton ,  Hoa Van Do ,  Natacha Supper

发明人： Andreas Berger ,  Eric Edward Fullerton ,  Hoa Van Do ,  Natacha Supper

IPC分类号： G11B5/66

CPC分类号： G11B5/66 ,  G11B5/656

摘要： A recording medium providing improved writeability in perpendicular recording applications includes a magnetic recording layer having an axis of magnetic anisotropy substantially perpendicular to the surface thereof, an exchange-spring layer ferromagnetically exchange coupled to the magnetic recording layer and having a coercivity less than the magnetic recording layer coercivity, and a coupling layer between the magnetic recording layer and the exchange-spring layer. The coupling layer regulates the ferromagnetic exchange coupling between the magnetic recording layer and the exchange-spring layer.

摘要翻译： 在垂直记录应用中提供改善的写入能力的记录介质包括具有基本上垂直于其表面的磁各向异性轴的磁记录层，耦合到磁记录层并具有小于磁记录的矫顽磁力的磁性交换弹簧层 层矫顽力和磁记录层与交换弹簧层之间的耦合层。 耦合层调节磁记录层与交换弹簧层之间的铁磁交换耦合。

公开(公告)号：US07758982B2

公开(公告)日：2010-07-20

申请号：US11218702

申请日：2005-09-02

申请人： Qing Dai ,  Hoa Van Do ,  Min Xiao ,  Bing K Yen

发明人： Qing Dai ,  Hoa Van Do ,  Min Xiao ,  Bing K Yen

IPC分类号： G11B5/716

CPC分类号： G11B5/72 ,  G11B5/8408

摘要： A SiON overcoat for use on magnetic media for magnetic recording. The SiON overcoat is deposited by pulsed DC sputtering while applying a negative DC bias. The SiON overcoat is especially useful on perpendicular magnetic recording media because of its ability to deposit thinly and evenly on a rough, granular high coercivity recording media while maintaining excellent corrosion protection properties. A SiON overcoat can be applied less than 3 nm thick while still maintaining excellent mechanical and corrosion protection. The overcoat also has a very high density and water contact angle.

摘要翻译： 用于磁性介质磁记录的SiON外套。 通过脉冲DC溅射沉积SiON外涂层，同时施加负DC偏压。 SiON外涂层在垂直磁记录介质中特别有用，因为它能够在粗糙的颗粒状高矫顽力记录介质上薄薄均匀地沉积，同时保持优异的防腐蚀性能。 SiON外涂层可以施加小于3nm厚，同时仍然保持优异的机械和腐蚀保护。 外套也具有非常高的密度和水接触角。

公开(公告)号：US07556870B2

公开(公告)日：2009-07-07

申请号：US11204979

申请日：2005-08-15

申请人： Hoa Van Do ,  Eric Edward Fullerton ,  David Thomas Margulies ,  Natacha Frederique Supper

发明人： Hoa Van Do ,  Eric Edward Fullerton ,  David Thomas Margulies ,  Natacha Frederique Supper

IPC分类号： G11B5/66

CPC分类号： G11B5/66

摘要： An embodiment of the invention is a layered magnetic thin film structure that uses antiferromagnetically coupled (AFC) magnetic layers where the top layer structure consists of an upper magnetic layer that is weakly ferromagnetically coupled via a nonmagnetic or weakly magnetic exchange coupling layer (interlayer) to a ferromagnetic exchange enhancing layer that is in turn, AF coupled to the lower ferromagnetic layer of the AFC structure. Preferred materials for the weak coupling layer include alloys of cobalt such as CoRu, CoBRu and CoCr in which the Co content is below the point at which the material would be ferromagnetic. A second embodiment of the invention is a laminated, AF-coupled media structure. In this structure the lower AFC layer that makes up the lower laminate layer includes: the middle magnetic layer, the weak ferromagnetic coupling layer, and the exchange enhancing layer.

摘要翻译： 本发明的一个实施方案是使用反铁磁耦合（AFC）磁性层的层状磁性薄膜结构，其中顶层结构由通过非磁性或弱磁性交换耦合层（中间层）弱铁磁耦合的上部磁性层组成， 铁磁交换增强层，其依次是AF耦合到AFC结构的下铁磁层。 用于弱耦合层的优选材料包括诸如CoRu，CoBRu和CoCr的钴的合金，其中Co含量低于材料将是铁磁性的点。 本发明的第二实施例是层叠的AF耦合介质结构。 在该结构中，构成下层叠层的下部AFC层包括：中间磁性层，弱铁磁性结合层和交换增强层。

公开(公告)号：US07482071B2

公开(公告)日：2009-01-27

申请号：US11135750

申请日：2005-05-24

申请人： Hoa Van Do ,  Bernd Heinz ,  Yoshihiro Ikeda ,  Kentaro Takano ,  Min Xiao

发明人： Hoa Van Do ,  Bernd Heinz ,  Yoshihiro Ikeda ,  Kentaro Takano ,  Min Xiao

IPC分类号： G11B5/66

CPC分类号： G11B5/65 ,  G11B5/656 ,  G11B5/66 ,  G11B5/667 ,  G11B5/732

摘要： A perpendicular magnetic recording disk has an improved recording layer of a granular CoPtCr-based ferromagnetic alloy with inter-granular material made up of one or more oxides of Cr and one or more oxides of one or more of a segregant of Si, Ta, Ti, B, Nb or Hf, wherein the amount of oxygen present in the recording layer is greater than about 22 atomic percent and less than about 35 atomic percent. The amount of oxygen in the recording layer is substantially greater than the amount required for the stoichiometric oxide or oxides of the segregant or segregants, and a substantial portion of the oxygen present in the recording layer is present in the inter-granular material. The recording layer exhibits high signal-to-noise ratio (SNR), a coercivity Hc greater than about 5000 Oe and a nucleation field Hn greater (more negative) than about −1500 Oe.

摘要翻译： 垂直磁记录盘具有改进的基于CoPtCr的铁磁性合金的记录层，其具有由一种或多种Cr的一种或多种氧化物和一种或多种Si，Ta，Ti分离的一种或多种氧化物构成的颗粒间材料 ，B，Nb或Hf，其中存在于记录层中的氧的量大于约22原子％且小于约35原子％。 记录层中的氧气量基本上大于分离器或分离器的化学计量氧化物或氧化物所需的量，并且记录层中存在的大部分氧气存在于颗粒间材料中。 记录层显示出高的信噪比（SNR），矫顽力Hc大于约5000Oe，成核场Hn大于（大于负））大于约-1500Oe。