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公开(公告)号：US09311948B2
公开(公告)日：2016-04-12
申请号：US12347141
申请日：2008-12-31
申请人： Erol Girt , Dieter K. Weller , Alexander Y. Dobin , Bogdan F. Valcu , Thomas F. Ambrose , Yingguo Peng , Yukiko A. Kubota , Abebe Hailu
发明人： Erol Girt , Dieter K. Weller , Alexander Y. Dobin , Bogdan F. Valcu , Thomas F. Ambrose , Yingguo Peng , Yukiko A. Kubota , Abebe Hailu
摘要： A perpendicular magnetic recording layer of a magnetic recording medium includes a plurality of bit-patterned magnetic islands, wherein each of the plurality of islands overlay a soft magnetic under-layer. Each of the magnetic islands includes a first magnetic sub-layer adjacent a second magnetic sub-layer, wherein the first sub-layer has a relatively high magnetic anisotropy that is greater than a magnetic anisotropy of the second sub-layer. The magnetic recording layer further includes a third sub-layer, which extends to connect each of the plurality of islands. The third sub-layer may have a magnetic anisotropy that is less than that of the second sub-layer of each of the magnetic islands and/or may serve as an interlayer, extending between the first sub-layer and the soft magnetic under-layer of the recording medium, and having a structure to help to produce the greater anisotropy first magnetic sub-layer.
摘要翻译： 磁记录介质的垂直磁记录层包括多个位图形磁岛，其中多个岛中的每一个覆盖软磁底层。 每个磁岛包括与第二磁性子层相邻的第一磁性子层，其中第一子层具有大于第二子层的磁各向异性的相对高的磁各向异性。 磁记录层还包括延伸以连接多个岛中的每一个的第三子层。 第三子层可以具有小于每个磁岛的第二子层的磁各向异性和/或可以用作在第一子层和软磁性底层之间延伸的中间层 并且具有有助于产生更大的各向异性的第一磁性子层的结构。
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公开(公告)号：US20100165508A1
公开(公告)日：2010-07-01
申请号：US12347141
申请日：2008-12-31
申请人： Erol Girt , Dieter K. Weller , Alexander Y. Dobin , Bogdan F. Valcu , Thomas F. Ambrose , Yingguo Peng , Yukiko A. Kubota , Abebe Hailu
发明人： Erol Girt , Dieter K. Weller , Alexander Y. Dobin , Bogdan F. Valcu , Thomas F. Ambrose , Yingguo Peng , Yukiko A. Kubota , Abebe Hailu
IPC分类号： G11B5/82
摘要： A perpendicular magnetic recording layer of a magnetic recording medium includes a plurality of bit-patterned magnetic islands, wherein each of the plurality of islands overlay a soft magnetic under-layer. Each of the magnetic islands includes a first magnetic sub-layer adjacent a second magnetic sub-layer, wherein the first sub-layer has a relatively high magnetic anisotropy that is greater than a magnetic anisotropy of the second sub-layer. The magnetic recording layer further includes a third sub-layer, which extends to connect each of the plurality of islands. The third sub-layer may have a magnetic anisotropy that is less than that of the second sub-layer of each of the magnetic islands and/or may serve as an interlayer, extending between the first sub-layer and the soft magnetic under-layer of the recording medium, and having a structure to help to produce the greater anisotropy first magnetic sub-layer.
摘要翻译： 磁记录介质的垂直磁记录层包括多个位图形磁岛，其中多个岛中的每一个覆盖软磁底层。 每个磁岛包括与第二磁性子层相邻的第一磁性子层，其中第一子层具有大于第二子层的磁各向异性的相对高的磁各向异性。 磁记录层还包括延伸以连接多个岛中的每一个的第三子层。 第三子层可以具有小于每个磁岛的第二子层的磁各向异性和/或可以用作在第一子层和软磁性底层之间延伸的中间层 并且具有有助于产生更大的各向异性的第一磁性子层的结构。
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公开(公告)号：US09972352B2
公开(公告)日：2018-05-15
申请号：US12544091
申请日：2009-08-19
申请人： Thomas P. Nolan , Bogdan F. Valcu , Li Tang
发明人： Thomas P. Nolan , Bogdan F. Valcu , Li Tang
摘要： Methods and media structures are provided for increasing writability and reducing unintentional erasure of perpendicular magnetic recording media. Variable permeability is controlled within a thin soft underlayer (SUL) structure, independent of bulk SUL material properties such as magnetic moment (Bs) and magnetic anisotropy (Hk). Media with an improved combination of easier writability on the recorded track and difficult erasure off-track (between tracks and on neighboring tracks) is achieved, in part, by an unbalanced antiferromagnetically coupled (AFC) SUL structure. A permeability gradient is established within the soft underlayer with layers having different values of permeability and magnetic thickness (Bs*t). In an aspect, a first SUL layer includes a high permeability region and an overlying low permeability region. A second layer antiferromagnetically couples the first layer to a low permeability third SUL layer. The present invention may be utilized with high density perpendicular recording media requiring carefully balanced magnetic properties.
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公开(公告)号：US20110043939A1
公开(公告)日：2011-02-24
申请号：US12544091
申请日：2009-08-19
申请人： Thomas P. Nolan , Bogdan F. Valcu , Li Tang
发明人： Thomas P. Nolan , Bogdan F. Valcu , Li Tang
摘要： Methods and media structures are provided for increasing writability and reducing unintentional erasure of perpendicular magnetic recording media. Variable permeability is controlled within a thin soft underlayer (SUL) structure, independent of bulk SUL material properties such as magnetic moment (Bs) and magnetic anisotropy (Hk). Media with an improved combination of easier writability on the recorded track and difficult erasure off-track (between tracks and on neighboring tracks) is achieved, in part, by an unbalanced antiferromagnetically coupled (AFC) SUL structure. A permeability gradient is established within the soft underlayer with layers having different values of permeability and magnetic thickness (Bs*t). In an aspect, a first SUL layer includes a high permeability region and an overlying low permeability region. A second layer antiferromagnetically couples the first layer to a low permeability third SUL layer. The present invention may be utilized with high density perpendicular recording media requiring carefully balanced magnetic properties.
摘要翻译： 提供了方法和介质结构，以提高可写性并减少垂直磁记录介质的无意擦除。 可变磁导率控制在薄的软底层（SUL）结构内，与体积SUL材料性质如磁矩（Bs）和磁各向异性（Hk）无关。 通过不平衡的反铁磁耦合（AFC）SUL结构实现了具有改善的在记录轨道上易于写入的组合和难以擦除离轨（在轨道和相邻轨道之间）的介质。 在软底层内形成渗透率梯度，其层具有不同的磁导率和磁厚度值（Bs * t）。 一方面，第一SUL层包括高磁导率区域和上覆的低磁导率区域。 第二层将第一层反铁磁耦合到低渗透性第三SUL层。 本发明可以用于需要仔细平衡的磁性能的高密度垂直记录介质。
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