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31. 发明授权

US06916557B2 Perpendicular magnetic recording media 失效
公开(公告)号：US06916557B2
公开(公告)日：2005-07-12
申请号：US10372335
申请日：2003-02-25
申请人： Yoshiyuki Hirayama , Hiroyuki Nakagawa , Hiroaki Nemoto , Ichiro Tamai , Ikuko Takekuma
发明人： Yoshiyuki Hirayama , Hiroyuki Nakagawa , Hiroaki Nemoto , Ichiro Tamai , Ikuko Takekuma
IPC分类号： G11B5/65 , B32B3/00 , G11B5/147 , G11B5/64 , G11B5/66 , G11B5/667 , G11B5/70 , G11B5/73 , G11B5/851
CPC分类号： B82Y10/00 , G11B5/656 , G11B5/66 , G11B5/7325 , G11B5/743 , Y10T428/24802
摘要： A perpendicular magnetic recording medium includes an intermediate film formed of a plurality of layers between a soft magnetic film and a perpendicular magnetization film. The intermediate film includes at least two layers, i.e., an oxygen-containing layer, or a nonmetallic element-containing layer containing nitrogen, silicon or carbon, and a metallic layer formed on a surface side of the oxygen-containing layer or the nonmetallic element-containing layer. The metallic layer includes a plurality of isolated island-shaped structures. Crystal grains of the perpendicular magnetization film are formed so as to correspond to the isolated island-shaped structures. As a result, a high recording density is obtained.

32. 发明授权

US08771849B2 Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus using the same 有权
标题翻译：垂直磁记录介质和使用其的磁记录/再现装置
公开(公告)号：US08771849B2
公开(公告)日：2014-07-08
申请号：US12288654
申请日：2008-10-21
申请人： Hiroaki Nemoto , Ikuko Takekuma , Ichiro Tamai , Yoshiyuki Hirayama
发明人： Hiroaki Nemoto , Ikuko Takekuma , Ichiro Tamai , Yoshiyuki Hirayama
IPC分类号： G11B5/66
CPC分类号： G11B5/732 , G11B5/65 , G11B5/66 , G11B5/667 , G11B5/7325
摘要： Embodiments of the present invention help allow accurate control of the magnetization reversal in a magnetic recording layer in small reversal units, whereby high-density recording can be achieved. According to one embodiment, by forming an intermediate layer having a granular structure similar to that of the magnetic recording layer below the magnetic recording layer, a continuous crystal grain boundary is formed at the interface between the magnetic recording layer and the intermediate layer, thereby preventing incomplete formation of the crystal grain boundary found in the initial growth layer of the magnetic recording layer. The intermediate layer comprises a non-magnetic alloy comprising Co and Cr as its main components and an oxide such as Al, Cr, Hf. Mg, Nb, Si, Ta, Ti and Zr. Further, the average content of the oxygen element in the intermediate layer is in the range from 6 at % to 20 at %.
摘要翻译：本发明的实施例有助于在小的反转单元中精确地控制磁记录层中的磁化反转，由此可以实现高密度记录。根据一个实施例，通过在磁记录层下方形成具有类似于磁记录层的颗粒结构的中间层，在磁记录层和中间层之间的界面处形成连续的晶界，从而防止在磁记录层的初始生长层中发现的晶界的不完全的形成。中间层包括以Co和Cr为主要成分的非磁性合金和Al，Cr，Hf等氧化物。 Mg，Nb，Si，Ta，Ti和Zr。此外，中间层中的氧元素的平均含量在6at％至20at％的范围内。

33. 发明申请

US20090073599A1 Perpendicular magnetic recording medium and magnetic recording and reproducing apparatus using the same 审中-公开
标题翻译：垂直磁记录介质和使用其的磁记录和再现设备
公开(公告)号：US20090073599A1
公开(公告)日：2009-03-19
申请号：US12231513
申请日：2008-09-02
申请人： Hiroaki Nemoto , Ikuko Takekuma , Zhengang Zhang
发明人： Hiroaki Nemoto , Ikuko Takekuma , Zhengang Zhang
IPC分类号： G11B5/596 , G11B5/62
CPC分类号： G11B5/66 , G11B5/65 , G11B5/82
摘要： Embodiments of the present invention provide a perpendicular magnetic recording medium suitable for high density recording. According to one embodiment, a magnetic recording layer comprises four layers in which a first magnetic layer, a magnetic coupling layer, a second magnetic layer, and a third magnetic layer are formed above a substrate. The first magnetic layer and the second magnetic layer are perpendicular magnetization films containing an oxide, and ferromagnetically coupled with each other by way of the magnetic coupling layer, and they are, more preferably, a Co alloy layer containing an oxide. The third magnetic layer is ferromagnetically coupled with the second magnetic layer. The concentration of the oxide contained in the third magnetic layer is lower than the concentration of the oxide in the second recording layer, or the third magnetic layer does not contain the oxide. In this case, magnetic property is set for the anisotropic magnetic field Hk1 of the first magnetic layer and the anisotropic magnetic field Hk2 of the second magnetic layer, so as to satisfy: Hk1>Hk2.
摘要翻译：本发明的实施例提供适用于高密度记录的垂直磁记录介质。根据一个实施例，磁记录层包括四个层，其中在衬底上形成第一磁性层，磁耦合层，第二磁性层和第三磁性层。第一磁性层和第二磁性层是含有氧化物的垂直磁化膜，并且通过磁耦合层铁磁耦合，更优选是含有氧化物的Co合金层。第三磁性层与第二磁性层铁磁耦合。包含在第三磁性层中的氧化物的浓度低于第二记录层中的氧化物的浓度，或者第三磁性层不含氧化物。在这种情况下，对于第一磁性层的各向异性磁场Hk1和第二磁性层的各向异性磁场Hk2设定磁特性，以满足：Hk1> Hk2。

34. 发明申请

US20070254189A1 Magnetic storage device 审中-公开
标题翻译：磁存储装置
公开(公告)号：US20070254189A1
公开(公告)日：2007-11-01
申请号：US11726691
申请日：2007-03-21
申请人： Hiroyuki Nakagawa , Ikuko Takekuma
发明人： Hiroyuki Nakagawa , Ikuko Takekuma
IPC分类号： G11B5/66 , G11B5/65
CPC分类号： G11B5/66 , G11B5/11 , G11B5/1278 , G11B5/3146 , G11B5/315 , G11B5/656 , G11B2005/0029
摘要： Embodiments in accordance with the present invention achieve a higher recording than that of the prior art by using a perpendicular magnetic recording medium showing good recording reproduction characteristics in combination with a shielded pole head. A perpendicular magnetic recording medium and a shielded pole head are used. The shielded pole head comprises a single pole type writer having a main pole and an auxiliary pole, and a magnetic shield is provided via a non-magnetic gap layer so as to cover at least the down-track direction of trailing side of the main pole. The perpendicular magnetic recording medium has two recording layers. The first recording layer comprises ferromagnetic crystal grains having Co as principal component and containing at least Cr and Pt, and grain boundaries containing an oxide. The second recording layer comprises an alloy having Co as principal component, containing at least Cr, and not containing an oxide. The saturation magnetization Ms1 (kA/m) of the first recording layer, the saturation magnetization Ms2 (kA/m) of the second recording layer and the film thickness ts (nm) of the soft-magnetic underlayer satisfy the following relation: 20+0.033*ts2+2.3*ts≦4/3*Ms1−Ms2≦329−0.024*ts2+1.9*ts
摘要翻译：根据本发明的实施例通过使用显示良好记录再现特性的垂直磁记录介质与屏蔽极头组合，实现了比现有技术更高的记录。使用垂直磁记录介质和屏蔽极头。屏蔽极头包括具有主极和辅助极的单极型写入器，并且经由非磁隙层提供磁屏蔽，以便至少覆盖主极的后侧的向下轨道方向。垂直磁记录介质具有两个记录层。第一记录层包括具有Co作为主要成分并且至少含有Cr和Pt以及含有氧化物的晶界的铁磁性晶粒。第二记录层包括具有Co作为主要成分的至少包含Cr并且不含有氧化物的合金。第一记录层的饱和磁化强度Ms 1（kA / m），第二记录层的饱和磁化强度Ms 2（kA / m）和软磁性底层的膜厚度ts（nm）满足以下关系： <？in-line-formula description =“In-line Formulas”end =“lead”？> 20 + 0.033 * ts <2> + 2.3 * ts <= 4/3 * Ms1-Ms2 < 329-0.024 * ts <2> + 1.9 * ts <？in-line-formula description =“In-line Formulas”end =“tail”？>

35. 发明申请

US20070188924A1 Perpendicular magnetic recording medium and magnetic storage apparatus using the same 有权
标题翻译：垂直磁记录介质及使用其的磁存储装置
公开(公告)号：US20070188924A1
公开(公告)日：2007-08-16
申请号：US11651922
申请日：2007-01-09
申请人： Ichiro Tamai , Ikuko Takekuma , Hiroaki Nemoto , Yoshiyuki Hirayama
发明人： Ichiro Tamai , Ikuko Takekuma , Hiroaki Nemoto , Yoshiyuki Hirayama
IPC分类号： G11B5/82
CPC分类号： G11B5/66 , G11B5/656 , G11B5/667
摘要： Embodiments in accordance with the present invention provide a perpendicular recording medium with low noise and high recording density by reducing the effects from noise generated from the vicinity of the interface with the intermediate layer of the recording layer, in a perpendicular recording medium utilizing a granular recording layer containing oxygen or oxide additive in a cobalt-chromium alloy formed on an intermediate layer with a ruthenium or ruthenium alloy layer. A first recording layer and a second recording layer are formed in order on an intermediate layer of ruthenium or ruthenium alloy. The first recording layer and the second recording layer are comprised of cobalt as the main material in a granular structure containing chromium and oxygen. The saturation magnetization of the first recording layer is lower than the saturation magnetization of the second recording layer. When a first recording layer saturation magnetization is set as Ms1 (emu per cubic centimeter), a second recording layer saturation magnetization is set as Ms2 (emu per cubic centimeter), and the first recording layer film thickness is set to t1 (nm), then (Ms2−Ms1)×t1 will be larger than 0 (memu per square centimeter) and smaller than 0.15 (memu per square centimeter).
摘要翻译：根据本发明的实施例通过减少在与记录层的中间层的界面附近产生的噪声的影响，在使用粒状记录的垂直记录介质中提供具有低噪声和高记录密度的垂直记录介质在含有钌或钌合金层的中间层上形成的钴 - 铬合金中含有氧或氧化物添加剂的层。在钌或钌合金的中间层上依次形成第一记录层和第二记录层。第一记录层和第二记录层由包含铬和氧的颗粒结构中的钴作为主要材料组成。第一记录层的饱和磁化强度低于第二记录层的饱和磁化强度。当第一记录层的饱和磁化强度设定为Ms 1（emu /立方厘米）时，第二记录层的饱和磁化强度设定为Ms 2（emu每立方厘米），第一记录层膜厚设定为t 1（ nm），则（Ms 2 -Ms 1）xt 1将大于0（每平方厘米的记忆）并小于0.15（每平方厘米的记忆）。

36. 发明申请

US20060134467A1 Perpendicular magnetic recording medium and method of manufacturing it 失效
公开(公告)号：US20060134467A1
公开(公告)日：2006-06-22
申请号：US11354085
申请日：2006-02-15
申请人： Yoshiyuki Hirayama , Ichiro Tamai , Takayuki Ichihara , Hiroyuki Nakagawa , Hiroaki Nemoto , Mineaki Kodama , Ikuko Takekuma
发明人： Yoshiyuki Hirayama , Ichiro Tamai , Takayuki Ichihara , Hiroyuki Nakagawa , Hiroaki Nemoto , Mineaki Kodama , Ikuko Takekuma
IPC分类号： G11B5/66 , C23C14/00
CPC分类号： G11B5/65 , G11B5/656 , G11B5/66 , G11B5/667 , G11B5/732 , G11B5/7325 , G11B5/84
摘要： Disclosed are a perpendicular magnetic recording medium with lower medium noise, insusceptible to thermal fluctuation and high recording resolution and a method of manufacturing it. As the step of forming a metal layer at the time of forming a recording layer on a non-magnetic substrate via a plurality of underlayers and the step of forming an oxide layer with an average thickness of 0.2 nm or less are repeated, the crystal grains are magnetically isolated without disturbing the orientation of the crystal grain of the recording layer of the perpendicular magnetic recording medium or without degrading the magnetic characteristic of the crystal grain of the recording layer.

37. 发明申请

US20060127703A1 Perpendicular magnetic recording medium for high density recording and manufacturing of the same 失效
标题翻译：用于高密度记录和制造的垂直磁记录介质
公开(公告)号：US20060127703A1
公开(公告)日：2006-06-15
申请号：US11295005
申请日：2005-12-05
申请人： Ikuko Takekuma , Reiko Arai , Yoko Ogawa , Yoshiyuki Hirayama , Yuzuru Hosoe , Tomio Iwasaki
发明人： Ikuko Takekuma , Reiko Arai , Yoko Ogawa , Yoshiyuki Hirayama , Yuzuru Hosoe , Tomio Iwasaki
IPC分类号： G11B5/66 , C23C14/00
CPC分类号： C23C14/568 , C23C14/025 , C23C14/0658 , C23C14/0688 , C23C14/584 , G11B5/65 , G11B5/732
摘要： Embodiments of the invention provide a medium which provides high media S/N and good corrosion resistance. According to one embodiment, in a perpendicular magnetic recording medium at least comprising a soft-magnetic underlayer, a seed layer, an intermediate layer, a magnetic recording layer and an overcoat layer which are stacked over a substrate in order, the magnetic recording layer has a granular structure which consists of many columnar grains of CoCrPt alloy and a grain boundary layer containing an oxide, the seed layer is made of TaNi alloy or TaTi alloy and the intermediate layer is made of Ru or Ru alloy which contains about 80 at. % Ru or more.
摘要翻译：本发明的实施方案提供了提供高介质S / N和良好耐腐蚀性的介质。根据一个实施例，在依次层叠在基板上的至少包括软磁性底层，种子层，中间层，磁记录层和覆盖层的垂直磁记录介质中，磁记录层具有由CoCrPt合金的许多柱状晶粒和含有氧化物的晶界层组成的粒状结构，种子层由TaNi合金或TaTi合金制成，中间层由含有约80at的Ru或Ru合金制成。％Ru或更多。

38. 发明申请

US20060088736A1 Perpendicular magnetic recording medium and manufacturing of the same 失效
公开(公告)号：US20060088736A1
公开(公告)日：2006-04-27
申请号：US11257978
申请日：2005-10-24
申请人： Takayuki Ichihara , Hiroyuki Nakagawa , Ikuko Takekuma , Ichiro Tamai
发明人： Takayuki Ichihara , Hiroyuki Nakagawa , Ikuko Takekuma , Ichiro Tamai
IPC分类号： G11B5/65 , C23C14/00
CPC分类号： C23C14/34 , G11B5/656 , G11B5/667 , G11B5/851
摘要： In a granular magnetic recording layer of a perpendicular magnetic recording medium, media noises are reduced by separating adequately magnetic crystal grains and non-magnetic grain boundary and decreasing magnetic exchange interactions among the magnetic crystal grains without causing damage to magnetic anisotropy of the magnetic crystal grains. In one embodiment, the perpendicular magnetic recording medium, in which crystal alloy grains containing Co, Pt, and Cr, and non-magnetic grain boundary containing Si and O is included; the ratio of the number of O atom to that of Si atom in the magnetic recording layer is between about 2.5 and 5; the Si atomic composition in the magnetic recording layer is between about 3 and 6 atomic %; and the O atomic composition in the magnetic recording layer is between about 12 and 20 atomic %, is used. The in-plane distribution of perpendicular coercivity at any points of the medium of the magnetic recording layer is made at most about ±10% of an average value.

39. 发明申请

US20050227121A1 Perpendicular magnetic recording media 失效
标题翻译：垂直磁记录介质
公开(公告)号：US20050227121A1
公开(公告)日：2005-10-13
申请号：US11148164
申请日：2005-06-09
申请人： Yoshiyuki Hirayama , Hiroyuki Nakagawa , Hiroaki Nemoto , Ichiro Tamai , Ikuko Takekuma
发明人： Yoshiyuki Hirayama , Hiroyuki Nakagawa , Hiroaki Nemoto , Ichiro Tamai , Ikuko Takekuma
IPC分类号： G11B5/65 , B32B3/00 , G11B5/147 , G11B5/64 , G11B5/66 , G11B5/667 , G11B5/70 , G11B5/73 , G11B5/851
CPC分类号： B82Y10/00 , G11B5/656 , G11B5/66 , G11B5/7325 , G11B5/743 , Y10T428/24802
摘要： A perpendicular magnetic recording medium includes an intermediate film formed of a plurality of layers between a soft magnetic film and a perpendicular magnetization film. The intermediate film includes at least two layers, i.e., an oxygen-containing layer, or a nonmetallic element-containing layer containing nitrogen, silicon or carbon, and a metallic layer formed on a surface side of the oxygen-containing layer or the nonmetallic element-containing layer. The metallic layer includes a plurality of isolated island-shaped structures. Crystal grains of the perpendicular magnetization film are formed so as to correspond to the isolated island-shaped structures. As a result, a high recording density is obtained.
摘要翻译：垂直磁记录介质包括由软磁膜和垂直磁化膜之间的多层形成的中间膜。中间膜包括至少两层，即含氧层或含有氮，硅或碳的非金属元素层，以及在含氧层或非金属元素的表面侧上形成的金属层包含层。金属层包括多个孤立的岛状结构。垂直磁化膜的晶粒形成为对应于孤立的岛状结构。结果，获得高记录密度。

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