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51.发明申请公开(公告)号：US20110151144A1
公开(公告)日：2011-06-23
申请号：US12969351
申请日：2010-12-15
申请人： Reiko Arai , Kiwamu Tanahashi , Yoshinori Honda , Mineaki Kodama
发明人： Reiko Arai , Kiwamu Tanahashi , Yoshinori Honda , Mineaki Kodama
摘要： Embodiments of the invention provide a perpendicular magnetic recording medium improved for fly ability, high in read signal quality, and capable of suppressing magnetic decay of recorded magnetization to be caused by stray fields. In one embodiment, a perpendicular recording layer is formed over a substrate with a soft magnetic underlayer therebetween, then an amorphous or nano-crystalline layer is formed between the substrate and the soft magnetic underlayer. The soft magnetic underlayer includes first and second amorphous soft magnetic layers, as well as a nonmagnetic layer formed between those first and second amorphous soft magnetic layers. The first and second amorphous soft magnetic layers are given uniaxial anisotropy in the radial direction of the substrate respectively and coupled with each other antiferromagnetically.
摘要翻译： 本发明的实施例提供了一种改进的飞行能力，高读取信号质量并且能够抑制由杂散场引起的记录磁化的磁衰减的垂直磁记录介质。 在一个实施例中，垂直记录层在其上具有软磁性底层的衬底上形成，然后在衬底和软磁性底层之间形成无定形或纳米晶层。 软磁性底层包括第一和第二非晶软磁性层，以及在这些第一和第二非晶软磁性层之间形成的非磁性层。 第一和第二非晶软磁性层分别在基板的径向方向上具有单轴各向异性，并且彼此反铁磁耦合。
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52.发明申请Perpendicular magnetic recording medium and magnetic storage device using the same 有权垂直磁记录介质和使用其的磁存储装置公开(公告)号：US20090257144A1
公开(公告)日：2009-10-15
申请号：US12384850
申请日：2009-04-08
申请人： Ichiro Tamai , Kiwamu Tanahashi
发明人： Ichiro Tamai , Kiwamu Tanahashi
摘要： Embodiments of the present invention provide a perpendicular magnetic recording medium that reduces the noise of granular recording layers, obtains sufficient overwrite characteristic that suppresses an increase in the magnetic cluster size, and allows high-density recording. According to one embodiment, a perpendicular magnetic recording medium comprising substrate having thereon at least soft magnetic layer, nonmagnetic intermediate layer, a perpendicular recording layer and protective layer formed in that order. The perpendicular recording layer consists of three or more layers of first recording layer, a second recording layer, and a third recording layer from the side nearer to the substrate. The first recording layer and the second recording layer have a granular structure comprising a grain boundary of an oxide surrounding ferromagnetic crystal grains containing Co and Pt, and the third recording layer has a non-granular structure mainly comprising Co and not containing an oxide. The grain boundary of the first recording layer contains Si, Cr and oxygen, and at least one element selected from Ti, Ta and Nb, and the grain boundary of the second recording layer contains Cr and oxygen, or contains Cr and oxygen and at least one element selected from Si, W and V.
摘要翻译： 本发明的实施例提供一种降低粒状记录层噪声的垂直磁记录介质，获得抑制磁簇大小增加的足够的重写特性，并允许高密度记录。 根据一个实施例，一种垂直磁记录介质，其包括至少在其上形成有软磁性层，非磁性中间层，垂直记录层和保护层的基板。 垂直记录层由三层或三层以上的第一记录层，第二记录层和第三记录层组成。 第一记录层和第二记录层具有包含包含Co和Pt的铁磁晶粒的氧化物的晶界的颗粒结构，并且第三记录层具有主要包含Co且不含氧化物的非颗粒结构。 第一记录层的晶界包含Si，Cr和氧，并且选自Ti，Ta和Nb中的至少一种元素，第二记录层的晶界包含Cr和氧，或含有Cr和氧，至少 一个元素选自Si，W和V.
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53.发明申请公开(公告)号：US20080180843A1
公开(公告)日：2008-07-31
申请号：US12009415
申请日：2008-01-17
申请人： Zhengang Zhang , Ikuko Takekuma , Kiwamu Tanahashi
发明人： Zhengang Zhang , Ikuko Takekuma , Kiwamu Tanahashi
CPC分类号： G11B5/1278 , B82Y10/00 , G11B5/743 , G11B5/855
摘要： Embodiments of the present invention provide a perpendicular magnetic recording medium having an improved writing property due to the exchange spring effect and capable of stable production. According to one embodiment, a perpendicular magnetic recording medium includes a non-magnetic substrate; an adhesion layer; a soft magnetic underlayer; a seed layer; and intermediate layer; a magnetic recording layer at least including a perpendicular recording layer, a writing assist layer, and a magnetic coupling layer disposed between the perpendicular recording layer and the writing assist layer; a protective layer, and a lubrication layer, in which the saturation magnetization of the magnetic coupling layer is lower than the saturation magnetization of the writing assist layer, the saturation magnetization of the magnetic coupling layer is 300 kA/m (300 emu/cc) or lower, and the thickness of the magnetic coupling layer is 1 nm or more and 3 nm or lower.
摘要翻译： 本发明的实施例提供一种垂直磁记录介质，由于交换弹簧效应而具有改进的书写特性并且能够稳定地生产。 根据一个实施例，垂直磁记录介质包括非磁性基板; 粘合层; 软磁底层; 种子层; 和中间层; 至少包括垂直记录层的磁记录层，书写辅助层和设置在垂直记录层和书写辅助层之间的磁耦合层; 保护层和润滑层，其中磁耦合层的饱和磁化强度低于写入辅助层的饱和磁化强度，磁耦合层的饱和磁化强度为300kA / m（300emu / cc） 或更低，并且磁耦合层的厚度为1nm以上且3nm以下。
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54.发明授权公开(公告)号：US07153596B2
公开(公告)日：2006-12-26
申请号：US10697002
申请日：2003-10-31
申请人： Kiwamu Tanahashi , Reiko Arai , Atsushi Kikugawa
发明人： Kiwamu Tanahashi , Reiko Arai , Atsushi Kikugawa
CPC分类号： G11B5/667 , G11B5/1278 , G11B5/66 , G11B5/84
摘要： A soft magnetic underlayer includes a first amorphous soft magnetic layer to which an exchange bias magnetic field is applied directly from an antiferromagnetic layer or via a ferromagnetic layer, and a second amorphous soft magnetic layer which is formed on the first amorphous soft magnetic layer via a non-magnetic layer. The first amorphous soft magnetic layer and the second amorphous soft magnetic layer are antiferromagnetically coupled.
摘要翻译： 软磁性底层包括第一非晶软磁性层，其中直接从反铁磁性层或通过铁磁性层施加交换偏置磁场，以及第二非晶软磁性层，其通过经由 非磁性层。 第一非晶软磁层和第二非晶软磁层是反铁磁耦合的。
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公开(公告)号：US07138195B2
公开(公告)日：2006-11-21
申请号：US10833001
申请日：2004-04-28
IPC分类号： G11B5/667
CPC分类号： B82Y25/00 , B82Y10/00 , G11B5/00 , G11B5/3909 , G11B5/653 , G11B5/667 , G11B5/7325 , G11B2005/0029
摘要： A double layer perpendicular magnetic recording medium having a high medium S/N ratio at a recording density of 50 Gb/in2 or higher and a magnetic storage apparatus with a lower error rate and excellent reliability are provided. In a perpendicular magnetic recording medium in which a soft magnetic underlayer 12, an intermediate layer 13, and a perpendicular magnetic recording layer 14 are sequentially formed on a substrate 11, the intermediate layer 13 is made to be a non-magnetic amorphous alloy, in which Ni is a main component and Zr is contained, and the soft magnetic underlayer 12 is constituted of ferromagnetic nan-crystals precipitated by annealing.
摘要翻译： 提供了记录密度为50Gb / in以上的具有高介质S / N比的双层垂直磁记录介质和具有较低错误率和优良可靠性的磁存储装置。 在其中在基板11上依次形成软磁性底层12，中间层13和垂直磁记录层14的垂直磁记录介质中，使中间层13成为非磁性非晶合金， 该Ni是主成分，含有Zr，软磁性底层12由通过退火而析出的铁磁性纳米晶体构成。
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公开(公告)号：US07050253B2
公开(公告)日：2006-05-23
申请号：US10404071
申请日：2003-04-02
申请人： Tetsuya Kanbe , Ichiro Tamai , Yuzuru Hosoe , Kiwamu Tanahashi , Yoshio Takahashi , Fumiyoshi Kirino , Nagatugu Koiso , Satoshi Matsunuma
发明人： Tetsuya Kanbe , Ichiro Tamai , Yuzuru Hosoe , Kiwamu Tanahashi , Yoshio Takahashi , Fumiyoshi Kirino , Nagatugu Koiso , Satoshi Matsunuma
IPC分类号： G11B5/02
CPC分类号： G11B5/7325 , C23C14/185 , G11B5/00 , G11B5/012 , G11B2005/001 , G11B2005/0016 , Y10S428/90 , Y10S428/928 , Y10T428/1107 , Y10T428/1121 , Y10T428/12507 , Y10T428/1266 , Y10T428/12667 , Y10T428/12674 , Y10T428/12819 , Y10T428/12826 , Y10T428/12868 , Y10T428/12944 , Y10T428/265
摘要： In a magnetic storage apparatus having a magnetic recording medium, a drive unit for driving this medium in a prespecified recording direction, a magnetic head assembly including a recorder section and reproduction section, means for causing the magnetic head to move relatively with respect to the magnetic record medium, and a record/playback signal processor means for performing signal inputting to the magnetic head and for effecting reproduction of an output signal from the magnetic head, the reproduction section of said magnetic head is composed of a magnetic head of the magnetoresistance effect type, while said magnetic record medium is structured including a substrate and a magnetic layer formed thereover with one or several underlayers being sandwiched therebetween, wherein at least one of the underlayers is a specific layer that is made of amorphous or microcrystalline materials containing therein Ni as the principal or main component thereof and further containing at least one kind of element as selected from the group consisting of Nb and Ta.
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57.发明申请公开(公告)号：US20050244679A1
公开(公告)日：2005-11-03
申请号：US11107588
申请日：2005-04-15
申请人： Reiko Arai , Kiwamu Tanahashi , Yoshinori Honda , Mineaki Kodama
发明人： Reiko Arai , Kiwamu Tanahashi , Yoshinori Honda , Mineaki Kodama
IPC分类号： G11B5/667 , G11B5/127 , G11B5/66 , G11B5/73 , G11B5/738 , G11B5/84 , G11B5/851 , G11B5/852 , H01F10/13 , H01F10/16 , H01F10/32 , H01F41/18
摘要： Embodiments of the invention provide a perpendicular magnetic recording medium improved for fly ability, high in read signal quality, and capable of suppressing magnetic decay of recorded magnetization to be caused by stray fields. In one embodiment, a perpendicular recording layer is formed over a substrate with a soft magnetic underlayer therebetween, then an amorphous or nano-crystalline layer is formed between the substrate and the soft magnetic underlayer. The soft magnetic underlayer includes first and second amorphous soft magnetic layers, as well as a nomnagnetic layer formed between those first and second amorphous soft magnetic layers. The first and second amorphous soft magnetic layers are given uniaxial anisotropy in the radial direction of the substrate respectively and coupled with each other antiferromagnetically.
摘要翻译： 本发明的实施例提供了一种改进的飞行能力，高读取信号质量并且能够抑制由杂散场引起的记录磁化的磁衰减的垂直磁记录介质。 在一个实施例中，垂直记录层在其上具有软磁性底层的衬底上形成，然后在衬底和软磁性底层之间形成无定形或纳米晶层。 软磁性底层包括第一和第二非晶软磁性层，以及在第一和第二非晶软磁性层之间形成的正磁性层。 第一和第二非晶软磁性层分别在基板的径向方向上具有单轴各向异性，并且彼此反铁磁耦合。
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公开(公告)号：US06894488B2
公开(公告)日：2005-05-17
申请号：US10082159
申请日：2002-02-26
IPC分类号： G11B5/00 , G11B5/012 , G11B5/02 , G11B5/73 , G11B5/84 , G11B20/10 , G11B20/24 , G11B27/36 , G01B7/00
CPC分类号： G11B5/667 , G11B5/00 , G11B5/012 , G11B20/10009 , G11B20/24 , G11B27/36 , G11B2005/001 , G11B2005/0029 , G11B2220/20
摘要： An object is to automatically detect the positions of spike noise, create a distribution diagram, and perform pass/fail decisions. The cross-correlation function of the signal waveform from a magnetic head 1 and a reference waveform simulating spike noise is used in extraction of spike noise. The number of peaks in the cross-correlation function exceeding a threshold value is counted, and quantitative evaluation of spike noise is performed.
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公开(公告)号：US20050042479A1
公开(公告)日：2005-02-24
申请号：US10936562
申请日：2004-09-09
CPC分类号： G11B5/66 , Y10T428/12465 , Y10T428/12861 , Y10T428/12875 , Y10T428/12986 , Y10T428/265
摘要： There is provided a perpendicular magnetic recording medium comprising a non-magnetic layer having a face-centered cubic structure, an antiferromagnetic layer provided on the non-magnetic layer, a soft magnetic underlayer provided on the antiferromagnetic layer, and a perpendicular recording layer provided on the soft magnetic underlayer, which magnetic recording medium makes it possible to realize a recording density not less than 50 Gb/in2 and makes the error rate thereof low while suppressing the spike noise.
摘要翻译： 提供了一种垂直磁记录介质，其包括具有面心立方结构的非磁性层，设置在非磁性层上的反铁磁层，设置在反铁磁层上的软磁性底层和设置在反铁磁层上的垂直记录层 软磁性底层，该磁记录介质使得可以实现不小于50Gb / in2的记录密度，并且在抑制尖峰噪声的同时使其误码率低。
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60.发明授权Perpendicular magnetic recording media and magnetic storage apparatus using the same 失效垂直磁记录介质及使用其的磁存储装置公开(公告)号：US06858330B2
公开(公告)日：2005-02-22
申请号：US10025784
申请日：2001-12-26
申请人： Kiwamu Tanahashi , Atsushi Kikugawa , Yukio Honda
发明人： Kiwamu Tanahashi , Atsushi Kikugawa , Yukio Honda
CPC分类号： G11B5/66 , Y10S428/90
摘要： Disclosed are a double-layer perpendicular magnetic recording medium having a high medium S/N at a recording density of 50 Gbit or more per square inch and a magnetic storage apparatus with high reliability, which shows a low error rate. In the perpendicular magnetic recording medium in which a pre-coating layer, a soft magnetic underlayer, an intermediate layer, and a perpendicular recording layer are sequentially formed on a substrate, the soft magnetic underlayer contains Fe, Ta and C as main components, a Ta concentration is set to a range from 8 at % to 15 at % , and a ratio of a C concentration to the Ta concentration (C concentration/Ta concentration) is set to a range from 0.5 to 0.9.
摘要翻译： 公开了一种记录密度为每平方英寸50Gbit以上的高介质S / N的双层垂直磁记录介质和具有高可靠性的磁存储装置，其显示出低错误率。 在基板上依次形成预涂层，软磁性底层，中间层和垂直记录层的垂直磁记录介质中，软磁性底层含有Fe，Ta和C作为主要成分， Ta浓度设定在8at％至15at％的范围内，C浓度与Ta浓度的比（C浓度/ Ta浓度）设定为0.5〜0.9。
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