公开(公告)号：US4900622A

公开(公告)日：1990-02-13

申请号：US97607

申请日：1987-09-16

申请人： Masatoshi Nakayama ,  Koji Kobayashi ,  Kunihiro Ueda ,  Mitsuru Takai ,  Shigeo Kurose

发明人： Masatoshi Nakayama ,  Koji Kobayashi ,  Kunihiro Ueda ,  Mitsuru Takai ,  Shigeo Kurose

IPC分类号： C23C14/22 ,  G11B5/66

CPC分类号： C23C14/226 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/265

摘要： A magnetic recording medium comprising a ferromagnetic metal thin film comprised predominantly of cobalt on a substrate is improved in durability and performance by forming the ferromagnetic metal thin film as a multi-layered structure including at least two layers, one or both of which contain an organic polymer. A plasma-polymerized film may be provided as an interlayer between the layers of the metal thin film or as a topcoat.

摘要翻译： 包含主要由钴在基片上的强磁性金属薄膜的磁记录介质通过形成强磁性金属薄膜作为包括至少两层的多层结构而提高了耐久性和性能，其中一层或两层含有有机层 聚合物。 等离子体聚合膜可以作为金属薄膜层之间的中间层或顶涂层而提供。

公开(公告)号：US4880687A

公开(公告)日：1989-11-14

申请号：US46317

申请日：1987-05-06

申请人： Kenji Yokoyama ,  Masatoshi Nakayama ,  Toru Shimozawa ,  Kunihiro Ueda ,  Fumio Maruta

发明人： Kenji Yokoyama ,  Masatoshi Nakayama ,  Toru Shimozawa ,  Kunihiro Ueda ,  Fumio Maruta

IPC分类号： G11B5/72

CPC分类号： G11B5/722 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/265 ,  Y10T428/30

摘要： In a magnetic recording medium wherein a metal thin film magnetic layer and an overcoat are formed on a nonmagnetic substrate, durability is improved when the overcoat comprises a plasma-polymerized film and a topcoat of an organic fluorine compound; a plasma-polymerized film, a protective carbon film, and a topcoat of an organic fluorine compound; a plasma-polymerized film containing C, F and H; or a plasma-polymerized organometallic film and a fluorine or silicon-containing topcoat. Oxidation of the upper surface of the magnetic layer with a plasma is also effective.

摘要翻译： 在其中在非磁性基板上形成金属薄膜磁性层和外涂层的磁记录介质中，当外涂层包含等离子体聚合膜和有机氟化合物的外涂层时，耐久性得到改善; 等离子体聚合膜，保护性碳膜和有机氟化合物的外涂层; 含有C，F和H的等离子体聚合膜; 或等离子体聚合的有机金属膜和含氟或含硅的顶涂层。 用等离子体氧化磁性层的上表面也是有效的。

公开(公告)号：US4844978A

公开(公告)日：1989-07-04

申请号：US795433

申请日：1985-11-06

申请人： Masatoshi Nakayama ,  Yasufumi Takasugi ,  Kunihiro Ueda

发明人： Masatoshi Nakayama ,  Yasufumi Takasugi ,  Kunihiro Ueda

IPC分类号： G11B5/72

CPC分类号： G11B5/72 ,  Y10S428/90 ,  Y10T428/24975 ,  Y10T428/265 ,  Y10T428/3154 ,  Y10T428/31544 ,  Y10T428/31692 ,  Y10T428/31699 ,  Y10T428/31935

摘要： In a magnetic recording medium comprising a substrate, a ferromagnetic metal thin film formed on the substrate, and a topcoat formed on the thin film, the topcoat is a plasma-polymerized film containing carbon and hydrogen in an atomic ratio of C/H of from 1 to 6, and having a thickness of 10 to 40 angstroms and a contact angle with water in the range of from 60.degree. to 130.degree..

摘要翻译： 在包括基板，形成在基板上的强磁性金属薄膜和形成在薄膜上的面涂层的磁记录介质中，外涂层是以C / H为原子比的碳和氢的等离子体聚合膜， 1〜6，厚度为10〜40埃，与水的接触角为60〜130度。

公开(公告)号：US4699847A

公开(公告)日：1987-10-13

申请号：US758434

申请日：1985-07-24

申请人： Masatoshi Nakayama ,  Haruyuki Morita ,  Yuichi Kubota ,  Keiko Tsuchiya

发明人： Masatoshi Nakayama ,  Haruyuki Morita ,  Yuichi Kubota ,  Keiko Tsuchiya

IPC分类号： C08F290/00 ,  C08F299/02 ,  C09D4/00 ,  C09D5/23 ,  C09D101/18 ,  C09D127/04 ,  C09D127/06 ,  C09D163/00 ,  C09D167/06 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702 ,  G11B5/73

CPC分类号： G11B5/7023 ,  G11B5/7026 ,  Y10S428/90 ,  Y10T428/31797 ,  Y10T428/31935

摘要： In a magnetic recording medium comprising a plastic base film and a magnetic layer, the base film is plasma treated at frequencies in the range of 10 kHz to 200 kHz in an inorganic gas containing at least 5% of oxygen. The magnetic layer is formed on the plasma treated base film by applying a magnetic composition of ferromagnetic fine particles dispersed in a plasticized binder compound comprising a radiation-sensitive modified resin in admixture with a radiation-sensitive modified flexible resin or prepolymer, oligomer or telomer thereof, and exposing the composition to radiation for crosslinking and polymerization.

摘要翻译： 在包括塑料基膜和磁性层的磁记录介质中，在含有至少5％的氧的无机气体中，将基膜在10kHz至200kHz范围内的频率进行等离子体处理。 通过将散射在包含辐射敏感性改性树脂的增塑粘合剂化合物中的铁磁细颗粒的磁性组合物与辐射敏感的改性柔性树脂或其预聚物，低聚物或调聚物混合，形成在等离子体处理的基底膜上的磁性层 ，并将组合物暴露于辐射用于交联和聚合。

公开(公告)号：US08357222B2

公开(公告)日：2013-01-22

申请号：US12952273

申请日：2010-11-23

申请人： Takayuki Yoshida ,  Masatoshi Nakayama ,  Ryota Igarashi

发明人： Takayuki Yoshida ,  Masatoshi Nakayama ,  Ryota Igarashi

IPC分类号： B22F9/16 ,  H01F1/14

CPC分类号： H01F1/065 ,  G11B5/70615 ,  G11B5/70621 ,  G11B5/714 ,  H01F1/0054 ,  H01F1/061 ,  H01F1/09 ,  Y10T428/2991

摘要： A metal magnetic powder for a magnetic recording medium is provided whose particles have a metal magnetic phase, composed mainly of Fe or Fe plus Co, and an oxide layer, wherein the average major axis length of the powder particles is 10-50 nm, the average particle volume including the oxide layer is 5,000 nm3 or less, the atomic ratio (R+Al+Si)/(Fe+Co) calculated using the content values (at. %) of the elements contained in the powder particles is 20% or less, where R is rare earth element (Y being treated as a rare earth element). The metal magnetic powder is obtained by using a complexing agent and a reducing agent to elute nonmagnetic constituents after firing. The metal magnetic powder exhibits a large saturation magnetization as for its particle volume while maintaining weatherability comparable to the conventional level and is suitable for a coated-type magnetic recording medium.

摘要翻译： 提供一种用于磁记录介质的金属磁粉，其颗粒具有主要由Fe或Fe + Co组成的金属磁性相和氧化物层，其中粉末颗粒的平均长轴长度为10-50nm， 包含氧化物层的平均粒子体积为5000nm 3以下，使用粉末颗粒中所含的成分的含量值（at。％）计算出的原子比（R + Al + Si）/（Fe + Co）为20％ 或更少，其中R是稀土元素（Y被当作稀土元素处理）。 通过使用络合剂和还原剂在烧制后洗脱非磁性成分得到金属磁性粉末。 金属磁性粉末对于其颗粒体积表现出大的饱和磁化强度，同时保持与常规水平相当的耐候性，并且适用于涂覆型磁记录介质。

公开(公告)号：US20110123830A1

公开(公告)日：2011-05-26

申请号：US13055948

申请日：2008-08-05

申请人： Kazuyuki Tohji ,  Takayuki Yoshida ,  Okayama Gotoh ,  Masatoshi Nakayama

发明人： Kazuyuki Tohji ,  Takayuki Yoshida ,  Okayama Gotoh ,  Masatoshi Nakayama

IPC分类号： G11B5/62 ,  H01F1/00 ,  H01F1/04

CPC分类号： G11B5/714 ,  B22F2998/00 ,  G11B5/70615 ,  H01F1/0054 ,  H01F1/053 ,  H01F1/09 ,  B22F9/24 ,  B22F1/02

摘要： According to a method for producing a metallic magnetic powder for magnetic recording, which comprises treatment including, in sequence, a step of allowing a reducing agent to act on a metallic magnetic powder comprising particles having a metallic magnetic phase composed mainly of Fe or Fe and Co and containing one or more of rare earth elements (including Y), Al and Si (these are hereinafter referred to as “nonmagnetic ingredient”), in a liquid containing a complexing agent capable of forming a complex with at least one or more of the nonmagnetic ingredients, to thereby make the nonmagnetic ingredient in the powder particles dissolve out into the liquid (dissolution treatment step), a step of heat treatment in a reducing gas atmosphere (re-reduction treatment step), and a step of heat treatment in an oxidizing gas atmosphere (stabilization treatment step), a metallic magnetic powder for magnetic recording, which comprises particles having a particle length of from 10 nm to 45 nm and an axial ratio of 2 or more and in which the tip part of the particles is rounded, is obtained.

摘要翻译： 根据制造用于磁记录的金属磁性粉末的方法，其包括处理步骤包括依次包括使还原剂作用于包含主要由Fe或Fe组成的金属磁性相的颗粒的金属磁性粉末和 Co，并且含有一种或多种稀土元素（包括Y），Al和Si（以下称为“非磁性成分”）在含有能够形成复合物的络合剂的液体中含有至少一种或多种 非磁性成分，从而使粉末颗粒中的非磁性成分溶解在液体中（溶解处理工序），在还原气体气氛中进行热处理的工序（再还原处理工序），热处理工序 氧化气体气氛（稳定化处理步骤），用于磁记录的金属磁性粉末，其包括粒径为10nm至45nm的颗粒 并且获得轴向比为2或更大并且其中颗粒的尖端部分被倒圆的轴向比。

公开(公告)号：US07854807B2

公开(公告)日：2010-12-21

申请号：US11727482

申请日：2007-03-27

申请人： Takayuki Yoshida ,  Masatoshi Nakayama ,  Ryota Igarashi

发明人： Takayuki Yoshida ,  Masatoshi Nakayama ,  Ryota Igarashi

IPC分类号： H01F1/147 ,  H01F1/20

CPC分类号： H01F1/065 ,  G11B5/70615 ,  G11B5/70621 ,  G11B5/714 ,  H01F1/0054 ,  H01F1/061 ,  H01F1/09 ,  Y10T428/2991

摘要： A metal magnetic powder for a magnetic recording medium is provided whose particles have a metal magnetic phase, composed mainly of Fe or Fe plus Co, and an oxide layer, wherein the average major axis length of the powder particles is 10-50 nm, the average particle volume including the oxide layer is 5,000 nm3 or less, the atomic ratio (R+Al+Si)/(Fe+Co) calculated using the content values (at. %) of the elements contained in the powder particles is 20% or less, where R is rare earth element (Y being treated as a rare earth element). The metal magnetic powder is obtained by using a complexing agent and a reducing agent to elute nonmagnetic constituents after firing. The metal magnetic powder exhibits a large saturation magnetization σs for its particle volume while maintaining weatherability comparable to the conventional level and is suitable for a coated-type magnetic recording medium.

摘要翻译： 提供一种用于磁记录介质的金属磁粉，其颗粒具有主要由Fe或Fe + Co组成的金属磁性相和氧化物层，其中粉末颗粒的平均长轴长度为10-50nm， 包含氧化物层的平均粒子体积为5000nm 3以下，使用粉末颗粒中所含的成分的含量值（at。％）计算出的原子比（R + Al + Si）/（Fe + Co）为20％ 或更少，其中R是稀土元素（Y被当作稀土元素处理）。 通过使用络合剂和还原剂在烧制后洗脱非磁性成分得到金属磁性粉末。 金属磁性粉末对于其颗粒体积具有大的饱和磁化强度，同时保持与常规水平相当的耐候性，并且适用于涂覆型磁记录介质。

公开(公告)号：US20050280934A1

公开(公告)日：2005-12-22

申请号：US10867743

申请日：2004-06-16

申请人： Masatoshi Nakayama

发明人： Masatoshi Nakayama

IPC分类号： G11B5/127 ,  G11B5/187

CPC分类号： G11B5/127 ,  G11B5/187 ,  Y10T428/1164

摘要： A thin-film head is provided wherein a protective film is formed on at least the surface facing a recording medium, said protective film containing Si, C and H in amounts of 3-9 at %, 61-81 at % and 16-30 at %, respectively, having a film thickness of 1-3 nm and having a refractive index of 2.0 or more. The resultant film has excellent coherence to the components of the thin-film head, rendering excellent durability to the head. Also, a method is provided for producing the thin-film head in which a thinner film can be obtained with less production steps and lower costs.

摘要翻译： 提供一种薄膜头，其中在至少面向记录介质的表面上形成保护膜，所述保护膜含有3-9原子％，61-81原子％和16-30重量％的Si，C和H at％，其膜厚为1-3nm，折射率为2.0以上。 所得膜对薄膜头部的组分具有优异的相干性，对头部具有优异的耐久性。 此外，提供了一种生产薄膜头的方法，其中可以以较少的生产步骤和较低的成本获得更薄的膜。

公开(公告)号：US4780354A

公开(公告)日：1988-10-25

申请号：US10990

申请日：1987-02-05

申请人： Masatoshi Nakayama ,  Kunihiro Ueda

发明人： Masatoshi Nakayama ,  Kunihiro Ueda

IPC分类号： G11B5/66 ,  C08L67/00 ,  G11B5/64 ,  G11B5/65 ,  G11B5/73 ,  G11B5/70

CPC分类号： G11B5/738 ,  G11B5/70 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/265

摘要： A magnetic recording medium comprising a substrate, a plasma polymerized film, and a magnetic layer is improved in physical and electromagnetic properties when the plasma polymerized film is comprised of carbon, or carbon and at least one optional element selected from hydrogen, nitrogen and oxygen.

摘要翻译： 当等离子体聚合膜由碳或碳和至少一种选自氢，氮和氧的任选元素组成时，包括基底，等离子体聚合膜和磁性层的磁记录介质的物理和电磁特性得到改善。

公开(公告)号：US4749608A

公开(公告)日：1988-06-07

申请号：US41340

申请日：1987-04-22

申请人： Masatoshi Nakayama ,  Yasufumi Takasugi ,  Kunihiro Ueda

发明人： Masatoshi Nakayama ,  Yasufumi Takasugi ,  Kunihiro Ueda

IPC分类号： G11B5/72

CPC分类号： G11B5/72 ,  Y10S428/90 ,  Y10T428/24975 ,  Y10T428/265 ,  Y10T428/3154 ,  Y10T428/31544 ,  Y10T428/31692 ,  Y10T428/31699 ,  Y10T428/31935

摘要： A magnetic recording medium comprising a substrate, a ferromagnetic metal thin film on the substrate, and a topcoat on the thin film exhibits improved strength and durability when the topcoat is comprised of a plasma-polymerized film prepared by activating a gaseous hydrocarbon monomer or a mixture thereof with a carrier gas into a plasma under specific conditions. The plasma-polymerized film consists of carbon and hydrogen in an atomic ratio of C/H of from 1:1 to 6:1 and has a thickness of 3 to 15 .ANG. and a contact angle with water in the range from 60.degree. to 120.degree.. An organic coating may be present on the plasma-polymerized film.

摘要翻译： 包括基底，基底上的强磁性金属薄膜和薄膜上的面涂层的磁记录介质当顶涂层由通过活化气态烃单体或混合物制备的等离子体聚合膜构成时，具有改进的强度和耐久性 在载体气体在特定条件下进入等离子体。 等离子体聚合膜由C / H原子比为1：1至6：1的碳和氢组成，厚度为3至15 ANGSTROM，与水的接触角为60°至120° DEG。 有机涂层可存在于等离子体聚合膜上。