公开(公告)号：US20070292721A1

公开(公告)日：2007-12-20

申请号：US11789891

申请日：2007-04-25

申请人： Andreas Berger ,  Xiaoping Bian ,  Qing Dai ,  Hoa Do ,  Eric Fullerton ,  Bernd Heinz ,  Yoshihiro Ikeda ,  David Margulies ,  Mary Minardi ,  Mohammad Mirzamaani ,  Hal Rosen ,  Natacha Supper ,  Kentaro Takano ,  Min Xiao

发明人： Andreas Berger ,  Xiaoping Bian ,  Qing Dai ,  Hoa Do ,  Eric Fullerton ,  Bernd Heinz ,  Yoshihiro Ikeda ,  David Margulies ,  Mary Minardi ,  Mohammad Mirzamaani ,  Hal Rosen ,  Natacha Supper ,  Kentaro Takano ,  Min Xiao

IPC分类号： G11B5/66 ,  G11B5/706

CPC分类号： G11B5/66 ,  G11B5/65 ,  G11B5/7325 ,  G11B5/851

摘要： A perpendicular magnetic recording medium including improvements to the recording layer (RL), exchange break layer (EBL), soft underlayer (SUL), overcoat (OC), adhesion layer (AL) and the combination of the layers. Advances in the RL include a cap layer. Improvements in the EBL include a multiple layer EBL.

摘要翻译： 包括对记录层（RL），交换破坏层（EBL），软底层（SUL），外涂层（OC），粘合层（AL）以及这些层的组合的改进的垂直磁记录介质。 RL的进步包括盖层。 EBL的改进包括多层EBL。

公开(公告)号：US20060210835A1

公开(公告)日：2006-09-21

申请号：US11084402

申请日：2005-03-18

申请人： Hoa Do ,  Eric Fullerton ,  David Margulies ,  Natacha Supper

发明人： Hoa Do ,  Eric Fullerton ,  David Margulies ,  Natacha Supper

IPC分类号： G11B5/66

CPC分类号： G11B5/656 ,  G11B5/66

摘要： 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.

摘要翻译： 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。

公开(公告)号：US20060210834A1

公开(公告)日：2006-09-21

申请号：US11084401

申请日：2005-03-18

申请人： Hoa Do ,  Eric Fullerton ,  David Margulies ,  Natacha Supper

发明人： Hoa Do ,  Eric Fullerton ,  David Margulies ,  Natacha Supper

IPC分类号： G11B5/66

CPC分类号： G11B5/656 ,  G11B5/66

摘要： 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.

摘要翻译： 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。

公开(公告)号：US20060199042A1

公开(公告)日：2006-09-07

申请号：US11073890

申请日：2005-03-07

申请人： Eric Fullerton ,  David Margulies ,  Natacha Supper ,  Hoa Do

发明人： Eric Fullerton ,  David Margulies ,  Natacha Supper ,  Hoa Do

IPC分类号： G11B5/66 ,  C23C14/00

CPC分类号： G11B5/66 ,  G11B5/732 ,  G11B5/7325 ,  G11B5/851

摘要： A method and apparatus for improving the signal-to-noise ratio in a longitudinal recording media is disclosed. The apparatus includes a first recording layer of the longitudinal recording media residing at the top of a recording media structure. The first recording layer includes an upper sublayer comprised of a CoPtCrB-based alloy material. The first recording layer also includes a lower sublayer comprised of a CoPtCrB-based alloy material and a middle sublayer comprised of a CoCrB-alloy. The middle sublayer is coupled to the upper sublayer and to the lower sublayer and is substantially thinner than the upper sublayer and the lower sublayer.

公开(公告)号：US20060177700A1

公开(公告)日：2006-08-10

申请号：US11051536

申请日：2005-02-04

申请人： Eric Fullerton ,  Hoa Do ,  David Margulies ,  Natacha Supper

发明人： Eric Fullerton ,  Hoa Do ,  David Margulies ,  Natacha Supper

IPC分类号： G11B5/66

CPC分类号： G11B5/66 ,  G11B5/656 ,  Y10T428/24975

摘要： A laminate structure is disclosed comprising multiple ferromagnetic layers achieving incoherent reversal while maintaining good SNR. A high magnetic moment density, low anisotropy field material may form a thin overlayer deposited over a high-anisotropy media layer. The media layer may have a lower magnetic moment density than the overlayer and have decoupled magnetic grains. A coupling layer may be interposed between the overlayer and the media layer to modulate the exchange there between, thereby reducing the pass-through of noise while still promoting incoherent reversal to achieve reduced write energy requirements.

摘要翻译： 公开了一种层叠结构，其包括多个铁磁层，同时保持良好的SNR，实现非相干反转。 高磁矩密度低的各向异性场材料可以形成沉积在高各向异性介质层上的薄覆盖层。 介质层可以具有比覆盖层更低的磁矩密度并且具有去耦的磁性颗粒。 耦合层可以插入在覆盖层和介质层之间以调制其间的交换，从而减少噪声的通过，同时仍然促进不相干的反转以实现降低的写入能量需求。

公开(公告)号：US20070037017A1

公开(公告)日：2007-02-15

申请号：US11204979

申请日：2005-08-15

申请人： Hoa Do ,  Eric Fullerton ,  David Margulies ,  Natacha Supper

发明人： Hoa Do ,  Eric Fullerton ,  David Margulies ,  Natacha 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。

公开(公告)号：US20050259362A1

公开(公告)日：2005-11-24

申请号：US10853431

申请日：2004-05-24

申请人： Hoa Do ,  David Margulies ,  Hal Rosen ,  Natacha Supper

发明人： Hoa Do ,  David Margulies ,  Hal Rosen ,  Natacha Supper

IPC分类号： G11B5/64 ,  G11B5/66 ,  G11B5/82

CPC分类号： G11B5/66 ,  G11B5/656 ,  G11B5/82

摘要： 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.

摘要翻译： 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。}

公开(公告)号：US20060177704A1

公开(公告)日：2006-08-10

申请号：US11231516

申请日：2005-09-21

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

发明人： Andreas Berger ,  Eric Fullerton ,  Hoa 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：US20050259351A1

公开(公告)日：2005-11-24

申请号：US10853631

申请日：2004-05-24

申请人： Hoa Do ,  David Margulies ,  Hal Rosen ,  Natacha Supper

发明人： Hoa Do ,  David Margulies ,  Hal Rosen ,  Natacha Supper

IPC分类号： G11B5/66 ,  G11B17/00

CPC分类号： G11B5/66

摘要： 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.

摘要翻译： 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。}

公开(公告)号：US20070212574A1

公开(公告)日：2007-09-13

申请号：US11372295

申请日：2006-03-09

申请人： Andreas Berger ,  Hoa Do ,  Eric Fullerton ,  Yoshihiro Ikeda ,  Byron Lengsfield ,  Natacha Supper

发明人： Andreas Berger ,  Hoa Do ,  Eric Fullerton ,  Yoshihiro Ikeda ,  Byron Lengsfield ,  Natacha Supper

IPC分类号： G11B5/66

CPC分类号： G11B5/66

摘要： 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.

摘要翻译： 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。