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    • 11. 发明申请
    • Magnetic recording medium with high areal recording density and magnetic recording apparatus
    • 具有高面积记录密度的磁记录介质和磁记录装置
    • US20060051620A1
    • 2006-03-09
    • US11223407
    • 2005-09-09
    • Tatsuya HinoueJo InagakiHiroyuki SuzukiKohei Tozawa
    • Tatsuya HinoueJo InagakiHiroyuki SuzukiKohei Tozawa
    • G11B5/66G11B5/23
    • G11B5/7325G11B5/23G11B5/656G11B5/66
    • A magnetic recording medium for attaining high areal recording density and a magnetic recording apparatus are provided. In one embodiment, a magnetic recording medium is provided which includes underlayers, a first magnetic layer, a first intermediate layer, a second magnetic layer, a second intermediate layer, a third magnetic layer, a protective layer and a lubricant layer formed in sequence on a substrate. The first magnetic layer comprises a cobalt-based alloy, and the second magnetic layer and the third magnetic layer each comprises a Co-based alloy containing platinum, chromium and boron. The concentration of chromium contained in the third magnetic layer is less than that in the second magnetic layer, the concentration of chromium contained in the third magnetic layer is about 15 at. % or less, and the first intermediate layer comprises ruthenium or an alloy having ruthenium as a main ingredient.
    • 提供了用于实现高面积记录密度的磁记录介质和磁记录装置。 在一个实施例中,提供了一种磁记录介质,其包括底层,第一磁性层,第一中间层,第二磁性层,第二中间层,第三磁性层,保护层和润滑剂层, 底物。 第一磁性层包括钴基合金,第二磁性层和第三磁性层各自包含含有铂,铬和硼的Co基合金。 第三磁性层中含有的铬的浓度小于第二磁性层中的铬浓度,第三磁性层中含有的铬的浓度为约15at。 %以下,第一中间层包含钌或以钌为主要成分的合金。
    • 13. 发明授权
    • Magnetic recording medium for high density recording
    • 用于高密度记录的磁记录介质
    • US07704613B2
    • 2010-04-27
    • US11415604
    • 2006-05-01
    • Hiroyuki SuzukiHidekazu KashiwaseAkira MorinagaTatsuya Hinoue
    • Hiroyuki SuzukiHidekazu KashiwaseAkira MorinagaTatsuya Hinoue
    • G11B5/66
    • G11B5/7325G11B5/656G11B5/66
    • A bit error rate is improved and, at the same time, an aging change due to thermal fluctuation is decreased. In one embodiment, a magnetic recording medium has first, second, third, and fourth magnetic layers stacked over the underlayer film on a substrate. The product (Brt2) of the residual magnetic flux density and film thickness of the second magnetic layer is smaller than the product (Brt3) of the residual magnetic flux density and film thickness of the third magnetic layer. The second magnetic layer has a thickness larger than that of the third magnetic layer and is anti-ferromagnetically coupled with the first magnetic layer by way of the first non-magnetic intermediate layer. The fourth magnetic layer is formed by way of a second non-magnetic intermediate layer above the third magnetic layer. The product (Brt4) of the residual magnetic flux density and film thickness of the fourth magnetic layer is from about 47% to 52% of the product (Brt_total) of the residual magnetic flux density and film thickness of the entire magnetic layers in a state of residual magnetization with the external magnetic field removed.
    • 改善了误码率,同时由于热波动引起的老化变化也降低。 在一个实施例中,磁记录介质具有层叠在基底上的下层膜上的第一,第二,第三和第四磁性层。 第二磁性层的剩余磁通密度和膜厚的乘积(Brt2)小于第三磁性层的剩余磁通密度和膜厚的乘积(Brt3)。 第二磁性层的厚度大于第三磁性层的厚度,并通过第一非磁性中间层与第一磁性层反铁磁耦合。 第四磁性层通过在第三磁性层上方的第二非磁性中间层形成。 剩余磁通密度和第四磁性层的膜厚的乘积(Brt4)为剩余磁通密度的乘积的约47%至52%(Brt_total)和处于整个状态的整个磁性层的膜厚度 的剩余磁化与外部磁场去除。
    • 15. 发明申请
    • Magnetic recording medium and manufacturing method thereof
    • 磁记录介质及其制造方法
    • US20090214895A1
    • 2009-08-27
    • US12378777
    • 2009-02-18
    • Tatsuya HinoueHiroshi KanaiToshinori OnoHiroyuki SuzukiHiroshi Inaba
    • Tatsuya HinoueHiroshi KanaiToshinori OnoHiroyuki SuzukiHiroshi Inaba
    • G11B5/66C23C14/04
    • G11B5/855C23C14/3414C23C30/00G11B5/66H01F41/34
    • Embodiments of the present invention produce discrete track media and bit patterned media having both excellent read/write performance and reliability. According to one embodiment, the medium comprises a magnetic layers formed by at least two ferromagnetic alloy layers with different compositions on a substrate. The ferromagnetic alloy layer located closest to the medium surface has more concentrated parts and less concentrated parts of nonmagnetic element in the in-plane direction. The more concentrated parts of the nonmagnetic element contain more nonmagnetic elements than the other parts except for an intermediate layer in the magnetic recording layer. The more concentrated parts and the less concentrated parts of the nonmagnetic element in the ferromagnetic alloy layer located closest to the medium surface are formed substantially concentric. The more concentrated parts of the nonmagnetic element is formed by being doped with ions of nonmagnetic element.
    • 本发明的实施例产生具有优异的读/写性能和可靠性的离散轨道介质和位图案化介质。 根据一个实施例,介质包括由衬底上具有不同组成的至少两个铁磁性合金层形成的磁性层。 位于最靠近介质表面的铁磁合金层在面内方向具有更多的集中部分和更少的非磁性元件的集中部分。 除了磁记录层中的中间层之外,非磁性元件的集中部分比其他部分含有更多的非磁性元件。 位于最靠近介质表面的铁磁性合金层中的非磁性元件的集中部分和较不集中的部分基本上是同心的。 通过掺杂非磁性元素的离子形成非磁性元件越集中的部分。