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    • 2. 发明申请
    • Disk drive with laminated magnetic thin films with sublayers for magnetic recording
    • 具有层叠磁性薄膜的磁盘驱动器,具有用于磁记录的子层
    • US20060210835A1
    • 2006-09-21
    • US11084402
    • 2005-03-18
    • Hoa DoEric FullertonDavid MarguliesNatacha Supper
    • Hoa DoEric FullertonDavid MarguliesNatacha Supper
    • G11B5/66
    • G11B5/656G11B5/66
    • The invention includes a disk drive with a magnetic recording disk with an upper and lower sublayer in at least one magnetic layer of a laminated magnetic layer structure that includes a spacer layer that substantially decouples the magnetic layers. The lower sublayer has a lower boron content than the upper sublayer and a preferred embodiment is CoPtCrBTa. The upper sublayer is deposited onto the lower sublayer and is preferably CoPtCrB with a higher boron content than the lower sublayer. The composition of the lower sublayer gives it a very low moment with low intrinsic coercivity which would not be useful as a recording layer on its own. The upper sublayer is a higher moment alloy with high intrinsic coercivity. An embodiment of the invention includes a laminated magnetic layer structure which is antiferromagnetically coupled to a lower ferromagnetic layer.
    • 本发明包括具有磁记录盘的磁盘驱动器,该磁盘驱动器具有在层叠磁性层结构的至少一个磁性层中具有上和下子层的磁记录盘,该磁层包括使磁性层基本上分离的间隔层。 下层具有比上层更低的硼含量,优选实施方案是CoPtCrBTa。 上部子层沉积在下部子层上,优选的是具有比下部子层更高的硼含量的CoPtCrB。 下层的组成使得其具有低固有矫顽力的非常低的力矩,其本身不会用作记录层。 上层是具有高固有矫顽力的较高的力矩合金。 本发明的实施例包括层叠的磁性层结构,其被反铁磁耦合到下铁磁层。
    • 3. 发明申请
    • Laminated magnetic thin films with sublayers for magnetic recording
    • 具有用于磁记录的子层的层压磁性薄膜
    • US20060210834A1
    • 2006-09-21
    • US11084401
    • 2005-03-18
    • Hoa DoEric FullertonDavid MarguliesNatacha Supper
    • Hoa DoEric FullertonDavid MarguliesNatacha Supper
    • G11B5/66
    • G11B5/656G11B5/66
    • The invention uses an upper and lower sublayer in at least one magnetic layer of a laminated magnetic layer structure that includes a spacer layer that substantially decouples the magnetic layers in a magnetic recording medium. The lower sublayer has a lower boron content than the upper sublayer and a preferred embodiment is CoPtCrBTa. The upper sublayer is deposited onto the lower sublayer and is preferably CoPtCrB with a higher boron content than the lower sublayer. The composition of the lower sublayer gives it a very low moment with low intrinsic coercivity which would not be useful as a recording layer on its own. The upper sublayer is a higher moment alloy with high intrinsic coercivity. An embodiment of the invention includes a laminated magnetic layer structure which is antiferromagnetically coupled to a lower ferromagnetic layer.
    • 本发明使用层叠磁性层结构的至少一个磁性层中的上部和下部子层,其包括使磁性记录介质中的磁性层基本上分离的间隔层。 下层具有比上层更低的硼含量,优选实施方案是CoPtCrBTa。 上部子层沉积在下部子层上,优选的是具有比下部子层更高的硼含量的CoPtCrB。 下层的组成使得其具有低固有矫顽力的非常低的力矩,其本身不会用作记录层。 上层是具有高固有矫顽力的较高的力矩合金。 本发明的实施例包括层叠的磁性层结构,其被反铁磁耦合到下铁磁层。
    • 6. 发明申请
    • Antiferromagnetically coupled media for magnetic recording with weak coupling layer
    • 用于具有弱耦合层的磁记录的反铁磁耦合介质
    • US20070037017A1
    • 2007-02-15
    • US11204979
    • 2005-08-15
    • Hoa DoEric FullertonDavid MarguliesNatacha Supper
    • Hoa DoEric FullertonDavid MarguliesNatacha Supper
    • G11B5/66
    • G11B5/66
    • 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.
    • 本发明的一个实施例是使用反铁磁耦合(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。
    • 7. 发明申请
    • Laminated magnetic recording medium having improved signal-to-noise ratio
    • 具有提高的信噪比的层压磁记录介质
    • US20050259362A1
    • 2005-11-24
    • US10853431
    • 2004-05-24
    • Hoa DoDavid MarguliesHal RosenNatacha Supper
    • Hoa DoDavid MarguliesHal RosenNatacha Supper
    • G11B5/64G11B5/66G11B5/82
    • G11B5/66G11B5/656G11B5/82
    • A magnetic recording medium has a laminated magnetic structure with at least three magnetic layers, wherein the magnetic layers have decreasing intrinsic coercivity H0 with distance from the write head. The write field at the center of each magnetic layer is greater than that layer's H0. The magnetic layers have different compositions and/or thicknesses and thereby different values of H0. The alloys used in the middle and upper magnetic layers are relatively “high-moment” alloys that would not ordinarily be used in magnetic recording media because they have relatively low S0NR, but the overall S0NR of the laminated magnetic structure is improved because of the effect of lamination. The middle and upper magnetic layers can be made substantially thinner, which enables the magnetic layers to be located closer to the write head, thereby exposing each of the magnetic layers to a higher write field.
    • 磁记录介质具有至少三个磁性层的层叠磁性结构,其中磁性层具有与写头距离更小的固有矫顽力H 0 0。 每个磁性层的中心处的写入场大于该层的H 0 0。 磁性层具有不同的组成和/或厚度,从而具有不同的H 0 O值。 在中上层磁性层中使用的合金是相对“高力矩”的合金,它们通常不会用于磁记录介质,因为它们具有相对较低的S O N,但总体上S 0得到改善。 可以使中上层磁性层和上磁性层实质上更薄,这使得磁层能够更靠近写入头位置,从而将每个磁性层暴露于较高的写入场。
    • 9. 发明申请
    • Magnetic recording system with three-layer laminated media having improved signal-to-noise ratio
    • 具有提高的信噪比的具有三层层压介质的磁记录系统
    • US20050259351A1
    • 2005-11-24
    • US10853631
    • 2004-05-24
    • Hoa DoDavid MarguliesHal RosenNatacha Supper
    • Hoa DoDavid MarguliesHal RosenNatacha Supper
    • G11B5/66G11B17/00
    • G11B5/66
    • A magnetic recording system uses a magnetic recording medium having a laminated magnetic structure with at least three magnetic layers, wherein the magnetic layers have decreasing intrinsic coercivity H0 with distance from the write head. The write field at the center of each magnetic layer is greater than that layer's H0. The magnetic layers have different compositions and/or thicknesses and thereby different values of H0. The alloys used in the middle and upper magnetic layers are relatively “high-moment” alloys that would not ordinarily be used in magnetic recording media because they have relatively low S0NR, but the overall S0NR of the laminated magnetic structure is improved because of the effect of lamination. The middle and upper magnetic layers can be made substantially thinner, which enables the magnetic layers to be located closer to the write head, thereby exposing each of the magnetic layers to a higher write field.
    • 磁记录系统使用具有至少三个磁性层的层叠磁性结构的磁记录介质,其中磁层具有与写入头距离更小的固有矫顽力H 0 0。 每个磁性层的中心处的写入场大于该层的H 0 0。 磁性层具有不同的组成和/或厚度,从而具有不同的H 0 O值。 在中上层磁性层中使用的合金是相对“高力矩”的合金,它们通常不会用于磁记录介质,因为它们具有相对较低的S O N,但总体上S 0得到改善。 可以使中上层磁性层和上磁性层实质上更薄,这使得磁层能够更靠近写入头位置,从而将每个磁性层暴露于较高的写入场。
    • 10. 发明申请
    • Perpendicular magnetic recording medium with multiple exchange-coupled magnetic layers having substantially similar anisotropy fields
    • 具有多个具有基本相似的各向异性场的交换耦合磁性层的垂直磁记录介质
    • US20070212574A1
    • 2007-09-13
    • US11372295
    • 2006-03-09
    • Andreas BergerHoa DoEric FullertonYoshihiro IkedaByron LengsfieldNatacha Supper
    • Andreas BergerHoa DoEric FullertonYoshihiro IkedaByron LengsfieldNatacha Supper
    • G11B5/66
    • G11B5/66
    • A perpendicular magnetic recording medium has an “exchange-spring” type magnetic recording layer (RL) formed of two ferromagnetic layers with substantially similar anisotropy fields that are ferromagnetically exchange-coupled by a nonmagnetic or weakly ferromagnetic coupling layer. Because the write head produces a larger magnetic field and larger field gradient at the upper portion of the RL, while the field strength decreases further inside the RL, the upper ferromagnetic layer can have a high anisotropy field. The high field and field gradient near the top of the RL, where the upper ferromagnetic layer is located, reverses the magnetization of the upper ferromagnetic layer, which then assists in the magnetization reversal of the lower ferromagnetic layer. Because both ferromagnetic layers in this exchange-spring type RL have a high anisotropy field, the thermal stability of the medium is not compromised. The medium shows improved writability, i.e., a low switching field, as well as lower intrinsic media noise, over a medium with a conventional single-layer RL.
    • 垂直磁记录介质具有由具有基本相似的各向异性场的两个铁磁层形成的“交换弹簧”型磁记录层(RL),其通过非磁性或弱铁磁耦合层进行铁磁交换耦合。 由于写头在RL的上部产生较大的磁场和较大的场梯度,而在RL内的场强进一步降低,所以上铁磁层可以具有高的各向异性场。 在RL的顶部附近的高场磁场梯度,其中上铁磁层位于其上,反转上铁磁层的磁化,其随后有助于下铁磁层的磁化反转。 由于这种交换弹簧型RL中的两个铁磁层具有高各向异性场,所以介质的热稳定性不受影响。 在具有常规单层RL的介质上,介质显示改进的可写性,即低切换场,以及较低的固有介质噪声。