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公开(公告)号：US06849164B2
公开(公告)日：2005-02-01
申请号：US10141781
申请日：2002-05-10
申请人： Toyoji Ataka , Yuji Ando , Satoru Nakamura , Katsuya Masuda , Manabu Shimosato
发明人： Toyoji Ataka , Yuji Ando , Satoru Nakamura , Katsuya Masuda , Manabu Shimosato
CPC分类号： G11B5/732 , G11B5/7325 , G11B5/8404
摘要： A magnetic recording medium and method of manufacturing the same including directly texturing a surface of a non-magnetic substrate made of a glass material to form circular concentric grooves thereon, forming a seed layer on the non-magnetic substrate, forming an under layer on the seed layer, forming a magnetic layer on the under layer, and forming a protective layer on the magnetic layer. A ratio of an in-plane remanent magnetization in a circumferential direction of the magnetic recording medium to an in-plane remanent magnetization in a radial direction of the magnetic recording medium is equal to or greater than 1.05.
摘要翻译： 一种磁记录介质及其制造方法，包括直接对由玻璃材料制成的非磁性基板的表面进行纹理化以在其上形成圆形同心凹槽，在非磁性基板上形成晶种层，在非磁性基板上形成下层 种子层，在下层上形成磁性层，在该磁性层上形成保护层。 磁记录介质的圆周方向上的面内剩余磁化强度与磁记录介质的径向方向上的平面内剩余磁化强度之比等于或大于1.05。
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公开(公告)号：US5939202A
公开(公告)日：1999-08-17
申请号：US944538
申请日：1997-10-07
申请人： Toyoji Ataka , Keiji Ohkubo , Noboru Kurata , Naoki Takizawa , Kazuo Enomoto
发明人： Toyoji Ataka , Keiji Ohkubo , Noboru Kurata , Naoki Takizawa , Kazuo Enomoto
CPC分类号： G11B5/7325 , Y10S428/90 , Y10T428/31678
摘要： A magnetic recording medium is provided which includes a non-magnetic base, and a non-magnetic metal base layer, a magnetic layer, and a protective layer, which are laminated in the order of description on the non-magnetic base, wherein the non-magnetic metal base layer is formed from an alloy film in which at least one element selected from the group consisting of W, Ta, Hf, Mo, Cr, Zr and Nb is added to NiAl.
摘要翻译： 提供了一种磁记录介质，其包括非磁性基底和非磁性金属基底层，磁性层和保护层，它们以非磁性基底上的描述顺序层叠，其中非磁性基底 磁性金属基层由其中从由W，Ta，Hf，Mo，Cr，Zr和Nb组成的组中选择的至少一种元素添加到NiAl的合金膜形成。
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公开(公告)号：US5891514A
公开(公告)日：1999-04-06
申请号：US971471
申请日：1997-11-17
申请人： Toyoji Ataka , Keiji Ohkubo
发明人： Toyoji Ataka , Keiji Ohkubo
摘要： In a method for manufacturing a magnetic recording medium, a non-metallic metal base layer, a ferromagnetic alloy thin-film magnetic layer and a protective layer are successively laminated on a non-magnetic substrate. The ferromagnetic alloy thin-film magnetic layer consists of a first magnetic layer and a second magnetic layer. In the method of the present invention, the first magnetic layer is formed in an atmosphere containing an Ar gas, and the second magnetic layer is formed in an atmosphere containing a mixture of Ar and N.sub.2 gases.
摘要翻译： 在制造磁记录介质的方法中，非金属基底层，铁磁合金薄膜磁性层和保护层依次层叠在非磁性基板上。 铁磁合金薄膜磁性层由第一磁性层和第二磁性层构成。 在本发明的方法中，第一磁性层在含有Ar气体的气氛中形成，第二磁性层在含有Ar和N 2气体的混合气氛中形成。
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公开(公告)号：US20130209836A1
公开(公告)日：2013-08-15
申请号：US13817141
申请日：2012-05-01
申请人： Toyoji Ataka , Shunji Takenoiri , Sadayuki Watanabe , Hirohisa Oyama , Yasuaki Hozumi , Satoshi Takahashi
发明人： Toyoji Ataka , Shunji Takenoiri , Sadayuki Watanabe , Hirohisa Oyama , Yasuaki Hozumi , Satoshi Takahashi
CPC分类号： G11B5/66 , G11B5/73 , G11B5/7325 , G11B5/8404 , G11B5/85 , G11B5/851
摘要： A perpendicular magnetic recording medium exhibits reduced noise and improved performance in such measures as SN ratio, and can realize high magnetic recording densities. In the perpendicular magnetic recording medium, at least a first nonmagnetic intermediate layer, second nonmagnetic intermediate layer, and magnetic recording layer are stacked in order on a nonmagnetic substrate. The first nonmagnetic intermediate layer is formed from a CoCrRuW alloy, and the second nonmagnetic intermediate layer is formed from an Ru-base alloy.
摘要翻译： 垂直磁记录介质在SN比等措施中表现出降低的噪声和改进的性能，并且可以实现高磁记录密度。 在垂直磁记录介质中，至少第一非磁性中间层，第二非磁性中间层和磁记录层依次层叠在非磁性基板上。 第一非磁性中间层由CoCrRuW合金形成，第二非磁性中间层由Ru基合金形成。
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5.发明申请公开(公告)号：US20080044688A1
公开(公告)日：2008-02-21
申请号：US11683353
申请日：2007-03-07
申请人： Tuqiang Li , Manabu Shimosato , Toyoji Ataka , Hiromi Ono , Kenichiro Soma , Hiroyuki Uwazumi , Souta Matsuo
发明人： Tuqiang Li , Manabu Shimosato , Toyoji Ataka , Hiromi Ono , Kenichiro Soma , Hiroyuki Uwazumi , Souta Matsuo
CPC分类号： H01F41/32 , G11B5/656 , G11B5/7325 , G11B5/7379 , G11B5/8404 , H01F10/16
摘要： A high-recording-density magnetic recording medium and a method of its manufacture can achieve a high OR with only a small reduction in Hcr. The magnetic recording medium has a nonmagnetic substrate and a first seed layer, a second seed layer, a first underlayer, a second underlayer, and a magnetic recording layer formed on the substrate in this order. The first seed layer can be a single layer or a plurality of layers made of at least one material selected from the group consisting of Ni—Ti alloys, Cr—Al alloys, Cr—Ta alloys, and Cr—Ti alloys. The second seed layer can be a single layer or a plurality of layers made of at least one material selected from the group consisting of Ni—W alloys, Ni—Ru—W alloys, and Co—W alloys. The first underlayer can be a single layer or a plurality of layers made of a Cr—Ru alloy. The second underlayer can be a single layer or a plurality of layers made of a Cr alloy comprising Cr and at least one element selected from the group consisting of Mo, B, Ti, and W. The second seed layer is formed by sputtering while applying a substrate bias voltage to the substrate. The surface of the second seed layer can be subject to a plasma processing or exposed to an oxygen-containing atmosphere or both.
摘要翻译： 高记录密度磁记录介质及其制造方法可以实现高OR，只有较小的Hcr降低。 该磁记录介质具有非磁性基板和第一种子层，第二种子层，第一底层，第二底层和磁性记录层，其依次形成在基板上。 第一种子层可以是由选自Ni-Ti合金，Cr-Al合金，Cr-Ta合金和Cr-Ti合金中的至少一种材料制成的单层或多层。 第二种子层可以是由选自Ni-W合金，Ni-Ru-W合金和Co-W合金中的至少一种材料制成的单层或多层。 第一底层可以是由Cr-Ru合金制成的单层或多层。 第二底层可以是包含Cr和选自Mo，B，Ti和W中的至少一种元素的Cr合金制成的单层或多层。通过溅射形成第二种子层 衬底偏压到衬底。 第二种子层的表面可以进行等离子体处理或暴露于含氧气氛或两者。
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6.发明授权公开(公告)号：US06667117B2
公开(公告)日：2003-12-23
申请号：US09802176
申请日：2001-03-08
申请人： Hiroyuki Uwazumi , Yasushi Sakai , Toyoji Ataka
发明人： Hiroyuki Uwazumi , Yasushi Sakai , Toyoji Ataka
IPC分类号： G11B5667
CPC分类号： G11B5/66 , Y10S428/90 , Y10T428/12465 , Y10T428/12861
摘要： A perpendicular magnetic recording medium is formed of a soft magnetic layer, an anti-ferromagnetic layer, a magnetic recording layer, a protective layer, and a liquid lubricant layer deposited in that order on a non-magnetic substrate. The anti-ferromagnetic layer is a Mn alloy containing at least Co at 10 atomic % or greater and 50 atomic % or less or a Mn alloy containing at least Ir at 10 atomic % or greater and 30 atomic % or less. A radial magnetic field is applied during formation of the anti-ferromagnetic layer and the soft magnetic layer. Exchange coupling with the anti-ferromagnetic layer controls magnetic domain walls of the soft magnetic layer. The need for heat treatment after film formation is eliminated.
摘要翻译： 垂直磁记录介质由在非磁性基板上依次沉积的软磁性层，抗铁磁层，磁记录层，保护层和液体润滑剂层形成。 反铁磁层是至少含有10原子％以上且50原子％以下的Co的Mn合金或至少含有10原子％以上且30原子％以下的Ir的Mn合金。 在形成反铁磁层和软磁层期间施加径向磁场。 与反铁磁层的交换耦合控制软磁层的磁畴壁。 消除了成膜后对热处理的需要。
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公开(公告)号：US20060115686A1
公开(公告)日：2006-06-01
申请号：US11333381
申请日：2006-01-17
申请人： Toyoji Ataka , Satoru Nakamura , Katsuya Masuda , Ryoichi Kadota , Yuji Ando
发明人： Toyoji Ataka , Satoru Nakamura , Katsuya Masuda , Ryoichi Kadota , Yuji Ando
CPC分类号： G11B5/8404 , G11B5/7379
摘要： A high-density magnetic recording medium uses a nonmetallic substrate, while still providing high in-plane magnetic anisotropy and remanent coercivity. Such a medium can be formed by depositing a seed layer on a textured surface of the nonmetallic substrate in a gas mixture containing oxygen or nitrogen and an inert gas, while controlling the oxygen concentration or nitrogen concentration, and subsequently exposing the surface of the seed layer to oxygen or nitrogen.
摘要翻译： 高密度磁记录介质使用非金属基底，同时仍具有高的面内磁各向异性和残余矫顽力。 可以通过在包含氧或氮气和惰性气体的气体混合物中将种子层沉积在非金属基底的纹理表面上，同时控制氧浓度或氮浓度，并随后暴露种子层的表面来形成这种介质 到氧气或氮气。
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公开(公告)号：US5576098A
公开(公告)日：1996-11-19
申请号：US085946
申请日：1993-07-06
申请人： Yuko Arimoto , Takabumi Fumoto , Keiji Okubo , Osamu Saito , Toyoji Ataka , Hisashi Yamasaki
发明人： Yuko Arimoto , Takabumi Fumoto , Keiji Okubo , Osamu Saito , Toyoji Ataka , Hisashi Yamasaki
CPC分类号： B82Y25/00 , G11B5/3109 , G11B5/3113 , G11B5/3153 , Y10S428/90 , Y10T428/1186 , Y10T428/265
摘要： A thin film magnetic head includes an upper magnetic core film and a lower magnetic core film laminated one on another through a magnetic gap layer. The upper and lower magnetic core films are multilayer thin films, respectively, each of which is composed of a plurality of magnetic thin film layers and a plurality of non-magnetic thin film layers, alternately laminated one on another. The magnetic core films and have single domain structures, respectively, and the use of such magnetic core films realizes a thin film magnetic head having high permeability at high frequencies and improved high frequency characteristics and attains high recording density.
摘要翻译： 薄膜磁头包括通过磁隙层彼此层叠的上磁芯膜和下磁芯膜。 上下磁芯膜是分别由层叠的多个磁性薄膜层和多个非磁性薄膜层构成的多层薄膜。 磁芯膜分别具有单畴结构，并且使用这种磁芯膜实现了在高频下具有高磁导率和改善的高频特性并获得高记录密度的薄膜磁头。
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公开(公告)号：US5503686A
公开(公告)日：1996-04-02
申请号：US402893
申请日：1995-03-13
申请人： Yuko Okamura , Keiji Ohkubo , Osamu Saito , Toyoji Ataka
发明人： Yuko Okamura , Keiji Ohkubo , Osamu Saito , Toyoji Ataka
CPC分类号： G11B5/3967 , C21D1/04 , C22F1/10 , G11B5/3163 , G11B5/3113
摘要： A magnetic recording head that includes a combined IN element and an MR element is heat treated under two types of magnetic fields. A rotating magnetic field, having a first magnetic field intensity, is applied for a time while the magnetic recording head is at an elevated temperature. Then, part-way during cooling of the magnetic head, the rotating magnetic field is replaced by a direct (non-rotating) magnetic field having a second magnetic field intensity. The second magnetic field intensity is lower than the first magnetic field intensity, whereby the properties of both the IN element and the MR element are maintained at high values.
摘要翻译： 包括组合的IN元件和MR元件的磁记录头在两种类型的磁场下进行热处理。 具有第一磁场强度的旋转磁场在磁记录头处于升高的温度下被施加一段时间。 然后，在磁头的冷却过程中，单向旋转磁场由具有第二磁场强度的直接（非旋转）磁场代替。 第二磁场强度低于第一磁场强度，由此将IN元件和MR元件的性质保持在高值。
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公开(公告)号：US09659592B2
公开(公告)日：2017-05-23
申请号：US13817141
申请日：2012-05-01
申请人： Toyoji Ataka , Shunji Takenoiri , Sadayuki Watanabe , Hirohisa Oyama , Yasuaki Hozumi , Satoshi Takahashi
发明人： Toyoji Ataka , Shunji Takenoiri , Sadayuki Watanabe , Hirohisa Oyama , Yasuaki Hozumi , Satoshi Takahashi
CPC分类号： G11B5/66 , G11B5/73 , G11B5/7325 , G11B5/8404 , G11B5/85 , G11B5/851
摘要： A perpendicular magnetic recording medium exhibits reduced noise and improved performance in such measures as SN ratio, and can realize high magnetic recording densities. In the perpendicular magnetic recording medium, at least a first nonmagnetic intermediate layer, second nonmagnetic intermediate layer, and magnetic recording layer are stacked in order on a nonmagnetic substrate. The first nonmagnetic intermediate layer is formed from a CoCrRuW alloy, and the second nonmagnetic intermediate layer is formed from an Ru-base alloy.
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