公开(公告)号：US20020164502A1

公开(公告)日：2002-11-07

申请号：US10061357

申请日：2002-02-04

Inventor： Kazuyuki Hayashi ,  Keisuke Iwasaki ,  Mamoru Kamigaki ,  Hiroko Morii

IPC: G11B005/706

CPC classification number: G11B5/712 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/2991 ,  Y10T428/2993 ,  Y10T428/2995 ,  Y10T428/2998

Abstract: A magnetic recording medium comprises: a non-magnetic base film; and a magnetic recording layer comprising a binder resin and magnetic composite particles having an average particle diameter of 0.02 to 0.70 nullm, comprising magnetic particles as core particles, a coating formed on surface of said magnetic particle, comprising at least one organosilicon compound selected from the group consisting of: (1) organosilane compounds obtainable from alkoxysilane compounds, and (2) polysiloxanes or modified polysiloxanes, and a phthalocyanine-based pigments coat formed on said coating layer comprising said organosilicon compound, in an amount of 1 to 100 parts by weight based on 100 parts by weight of said magnetic particles.

Abstract translation: 磁记录介质包括：非磁性基膜; 以及磁性记录层，其包含粘结剂树脂和平均粒径为0.02-0.70μm的磁性复合颗粒，其包含作为核心颗粒的磁性颗粒，在所述磁性颗粒的表面上形成的涂层，其包含至少一种选自以下的有机硅化合物： 该组由以下组成：（1）由烷氧基硅烷化合物得到的有机硅烷化合物和（2）聚硅氧烷或改性聚硅氧烷以及在所述包含有机硅化合物的涂层上形成的酞菁系颜料涂层，其量为1〜100重量份 基于100重量份的所述磁性颗粒。

公开(公告)号：US20020110705A1

公开(公告)日：2002-08-15

申请号：US09912648

申请日：2001-07-24

Inventor： Hiroaki Doushita ,  Satoshi Matsubaguchi ,  Tetsuji Nishida

IPC: G11B005/706

CPC classification number: G11B5/70678 ,  G11B5/7305

Abstract: Provided is a magnetic recording medium having good electromagnetic characteristics, particularly both improved high-density recording characteristics and good durability, and particularly a C/N ratio that is markedly improved in the high-density recording region. A magnetic recording medium comprising a nonmagnetic lower layer and a magnetic layer provided in this order on a support wherein said magnetic layer comprises a ferromagnetic metal powder or a ferromagnetic hexagonal ferrite powder and a binder and has a coercive force equal to or higher than 143 kA/m. Said magnetic recording medium is a medium for recording signals having a surface recording density ranging from 0.2 to 2 Gbit/inch2; said support has a thickness equal to or less than 5.5 nullm and a Young's modulus in the MD direction equal to or higher than 11,000 Mpa; and said support has on the reverse surface from said magnetic layer a backcoat layer, said backcoat layer having not fewer than 200 and not more than 1,000 protrusions having a height equal to or higher than 50 nm per 10,000 nullm2.

Abstract translation: 提供了具有良好的电磁特性，特别是提高的高密度记录特性和良好的耐久性的磁记录介质，特别是在高密度记录区域中显着提高的C / N比。 一种磁性记录介质，其特征在于，在支承体上依次设有非磁性下层和磁性层，其中，所述磁性层包含强磁性金属粉末或铁磁性六角铁氧体粉末和粘结剂，矫顽力为143kA以上 / m。 所述磁记录介质是用于记录表面记录密度范围为0.2至2Gbit / inch 2的信号的介质; 所述载体的厚度等于或小于5.5μm，MD方向的杨氏模量等于或高于11000Mpa; 并且所述支撑体在所述磁性层的背面上具有背涂层，所述背涂层具有不小于200且不大于1,000个突起，其高度等于或高于每10,000mum2的50nm。

公开(公告)号：US20030118868A1

公开(公告)日：2003-06-26

申请号：US09970034

申请日：2001-10-04

Inventor： Kenji Okinaka ,  Masayuki Uegami

IPC: G11B005/706

CPC classification number: B82Y30/00 ,  C01P2002/60 ,  C01P2004/50 ,  C01P2004/51 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2004/84 ,  C01P2006/10 ,  C01P2006/11 ,  C01P2006/12 ,  C01P2006/22 ,  C01P2006/42 ,  G11B5/70621 ,  Y10S428/90 ,  Y10T428/2982 ,  Y10T428/2991

Abstract: Spindle-shaped magnetic metal particles containing iron as a main component of the present invention, have an average major axis diameter (L) of 0.05 to 0.15 nullm; a coercive force of 111.4 to 143.2 kA/m; a Co content of from 0.5 to less than 5 atm % based on whole Fe; a crystallite size of from 150 to less than 170 null; a ratio of Al to Co from 1.0:1 to less than 2.0:1; a specific surface area (S) represented by the formula: Snullnull160nullLnull65; an oxidation stability (nullnulls) of saturation magnetization of not more than 5.0%; and an ignition temperature of not less than 140null C. The spindle-shaped magnetic metal particles containing iron as a main component, exhibit an adequate coercive force, and are excellent in dispersibility, oxidation stability and coercive force distribution despite fine particles, especially notwithstanding the particles have an average major axis diameter as small as 0.05 to 0.15 nullm.

Abstract translation: 以铁为主要成分的锭子状磁性金属粒子的平均长轴直径（L）为0.05〜0.15μm; 强制力为111.4〜143.2 kA / m; 基于整个Fe的Co含量为0.5至小于5atm％; 微晶尺寸为150至小于170; Al与Co的比例为1.0：1至小于2.0：1; 由下式表示的比表面积（S）：S <= 160×L + 65; 饱和磁化强度不超过5.0％的氧化稳定性（DELTAsigmas）; 并且点火温度不低于140℃。以铁为主要成分的纺锤形磁性金属颗粒呈现足够的矫顽力，尽管细小颗粒仍具有优异的分散性，氧化稳定性和矫顽力分布，特别是尽管如此 颗粒的平均长轴直径小至0.05至0.15μm。

公开(公告)号：US20010031374A1

公开(公告)日：2001-10-18

申请号：US09828819

申请日：2001-04-10

Inventor： Chung Nam Whang ,  Gap Soo Chang ,  Keun Hwa Chae ,  Kwang Ho Jeong

IPC: H01F010/12 ,  C23C014/04 ,  B32B015/04 ,  G11B005/716 ,  G11B005/706 ,  C23C014/48

CPC classification number: H01F41/14 ,  G11B5/64 ,  G11B5/855 ,  H01F10/1936 ,  H01F41/18 ,  Y10T428/12438 ,  Y10T428/12597 ,  Y10T428/265

Abstract: The present invention relates to a magnetic film having a magnetic easy axis in a preformed area, and a method of forming the magnetic film Especially, the present invention relates to a method of forming a multiple magnetic easy-axis in a preformed magnetic film and a magnetic film having multiple easy-axis by the same method of forming the multiple easy axis. It is an object of the present invention to overcome the drawbacks of the conventional magnetic film and to achieve ultrahigh density of the unit recording cells using the magnetic film. It is another object of the present invention to suggest a method of forming a magnetic film and a magnetic film device in which the exchange interaction and the magneto-static interaction between the neighboring areas are eliminated in order to accomplish ultrahigh density for storing data, The present invention presents first, a magnetic film (or area) having a magnetic easy axis and a method of forming a magnetic easy axis on the magnetic film. The magnetic moments of the magnetic area having an easy axis are automatically aligned to the axis without an external magnetic field. This means that the magnetic moments of the magnetic area having an easy axis are strictly limited to the state in which the easy axis is same in magnitude but opposite in directions. Second, this invention presents a magnetic thin film having two neighboring areas with different direction of easy axis in each area so that the exchange interaction between the two neighboring areas is greatly reduced or eliminated.

Abstract translation: 本发明涉及在预成形区域中具有易磁化轴的磁性膜以及形成磁性膜的方法。特别地，本发明涉及在预成形的磁性膜中形成多个磁性易轴的方法和 通过形成多个容易轴的相同方法，具有多个易轴的磁性膜。 本发明的一个目的是克服常规磁性膜的缺陷，并且使用该磁性膜实现单位记录单元的超高密度。 本发明的另一个目的是提出一种形成磁膜和磁膜装置的方法，其中消除了相邻区域之间的交换相互作用和磁静电相互作用，以便实现用于存储数据的超高密度。 本发明首先提出了具有易磁化轴的磁性膜（或区域）和在磁性膜上形成易磁化轴的方法。 具有容易轴的磁性区域的磁矩自动地对准轴而没有外部磁场。 这意味着具有容易轴的磁性区域的磁矩被严格地限制在容易轴的大小相同但方向相反的状态。 第二，本发明提出了一种具有两个相邻区域的磁性薄膜，每个区域具有不同的易轴方向，从而大大减少或消除了两个相邻区域之间的交换相互作用。

公开(公告)号：US20010012574A1

公开(公告)日：2001-08-09

申请号：US09756797

申请日：2001-01-10

Applicant: Victor Company of Japan, Ltd.

Inventor： Yoshiteru Matsubayashi ,  Hiroto Nagamine

IPC: G11B005/706

CPC classification number: G11B5/708 ,  G11B5/70689

Abstract: A magnetic recording medium of a coated type being formed by coating magnetic paint, which is mixed with and dispersed by a magnetic powder and a resin and an additive, on a substrate, the magnetic powder comprises a magnetite (Fe3O4) powder of which a surface is stuck with powdered carbon black, wherein a sticking amount of the powdered carbon black is within a range of 1 to 20 weight % per the magnetite powder.

Abstract translation: 通过将磁性粉末与树脂和添加剂混合并分散在其上的磁性涂料形成在涂覆型磁性记录介质上，该磁性粉末包括一种磁铁矿（Fe3O4）粉末，其表面 与粉状炭黑粘合，其中粉状炭黑的粘附量在每个磁铁矿粉末中在1至20重量％的范围内。

公开(公告)号：US20030082409A1

公开(公告)日：2003-05-01

申请号：US10183522

申请日：2002-06-28

Applicant: FUJI PHOTO FILM CO., LTD.

Inventor： Nobuo Yamazaki ,  Shinji Saito

IPC: G11B005/706

CPC classification number: G11B5/70678 ,  Y10T428/24355

Abstract: A magnetic recording medium for reproduction of MR head comprising a support having thereon a substantially non-magnetic low layer and a magnetic layer comprising ferromagnetic hexagonal system ferrite particles dispersed in a binder, in this order, wherein a power spectrum of density at a spatial frequency of 100/mm having frequency-analyzed a surface roughness of the magnetic layer is 10,000 nm3 or less, the power spectrum of density at a spatial frequency of 500/mm is 50 to 500 nm3 and an average tabular diameter of the ferromagnetic hexagonal system ferrite particles is 15 to 35 nm.

Abstract translation: 一种用于再现MR磁头的磁记录介质，包括其上具有基本上非磁性的低层的载体和包含分散在粘合剂中的铁磁六方晶系铁氧体颗粒的磁性层，其中空间频率的密度的功率谱 经过频率分析的磁性层的表面粗糙度为100 / mm，为10000nm 3以下，空间频率为500 / mm的密度的功率谱为50〜500nm 3，铁磁性六方晶系铁氧体的平均直径 颗粒为15至35nm。

公开(公告)号：US20030044648A1

公开(公告)日：2003-03-06

申请号：US10196131

申请日：2002-07-17

Applicant: Toda Kogyo Corporation

Inventor： Kohji Mori ,  Yasutaka Ota

IPC: G11B005/706

CPC classification number: B22F1/0007 ,  B22F1/004 ,  G11B5/70621 ,  H01F1/061 ,  H01F1/442 ,  Y10T428/2982

Abstract: Magnetic acicular alloy particles containing iron as a main component according to the present invention, have an average major axial diameter of 0.05 to 0.2 nullm, and pH values of water suspensions of said magnetic acicular alloy particles containing iron as a main component, which satisfies the formula: (pH value of water suspension treated by A method)null(pH value of water suspension treated by B method)

Abstract translation: 以铁为主要成分的根据本发明的磁针状合金粒子的平均主轴径为0.05〜0.2μm，所述含有铁的磁性针状合金粒子的水悬浮液的pH值为 （通过A法处理的水悬浮液的pH值） - （通过B法处理的水悬浮液的pH值）<0以铁为主要成分的磁性针状合金粒子在车辆中表现出优异的分散性，特别是这种车辆 由具有极性基团如-SO 3 M（其中M为H，Na或K），-COOH等的粘合剂树脂组成，其中涂膜中的取向和填充密度提高。

公开(公告)号：US20030027018A1

公开(公告)日：2003-02-06

申请号：US10152345

申请日：2002-05-22

Inventor： Kazuyuki Hayashi ,  Hiroko Morii ,  Mamoru Kamigaki ,  Yasuyuki Tanaka ,  Keisuke Iwasaki

IPC: G11B005/706

CPC classification number: G11B5/712 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/2991 ,  Y10T428/2993 ,  Y10T428/2995 ,  Y10T428/2996 ,  Y10T428/31663

Abstract: A magnetic recording medium using black magnetic acicular composite particles produced by forming a single carbon black coat between the surface of magnetic acicular cobalt-coated iron oxide particle or magnetic acicular metal particle and a coating comprising at least one organosilicon compound, in an amount of from more than 10 to 40 parts by weight based on 100 parts by weight of the magnetic acicular particles, exhibits not only a smooth surface, a smaller light transmittance and a lower surface electrical resistivity value, but also a small friction coefficient and an excellent running durability.

Abstract translation: 一种使用黑色磁性针状复合颗粒的磁记录介质，其通过在磁性针状钴涂覆的氧化铁颗粒或磁性针状金属颗粒的表面和包含至少一种有机硅化合物的涂层之间形成单一的炭黑涂层，其量为 相对于100重量份的针状粒子，10重量份以上40重量份以上，不仅具有光滑的表面，较小的透光率和较低的表面电阻率值，而且摩擦系数小，运行耐久性优异 。

公开(公告)号：US20020064686A1

公开(公告)日：2002-05-30

申请号：US09956036

申请日：2001-09-20

Applicant: FUJI PHOTO FILM CO., LTD.

Inventor： Hiroaki Araki ,  Mikio Ohno ,  Toshichika Aoki

IPC: G11B005/706

CPC classification number: G11B5/70 ,  G11B5/7085 ,  G11B5/714 ,  Y10T428/24355 ,  Y10T428/24372

Abstract: A magnetic recording medium is provided comprising a non-magnetic support and at least one magnetic layer comprising ferromagnetic metal particles principally containing iron, having a spindle shape and having an average major axis length of 0.15 nullm or less, and a binder resin, and optionally further comprising, between the support and the magnetic layer, at least one adhesive layer or at least one non-magnetic layer principally containing a non-magnetic inorganic powder and a binder, and wherein center line average surface roughness Ra of the magnetic layer surface being 2 to 6 nm, said recording medium having the following properties; steel ball wear at 23null C. and 70%RH being 2null10null5 to 4null10null5 mm3, surface C/Fe ratio measured by Auger electron spectroscopy being 50 to 100, and coefficient of friction between the magnetic layer surface and an SUS rod having a roughness of 8 to 10 nm being 0.2 to 0.3.

Abstract translation: 提供了一种磁记录介质，其包括非磁性载体和至少一个磁性层，所述至少一个磁性层包含主要包含铁的铁磁性金属颗粒，其主轴形状和平均长轴长度为0.15μm或更小，以及粘合剂树脂， 还包括在所述支撑体和所述磁性层之间的至少一个粘合剂层或主要包含非磁性无机粉末和粘合剂的至少一个非磁性层，并且其中所述磁性层表面的中心线平均表面粗糙度Ra为 2〜6nm，所述记录介质具有以下特性; 在23℃，70％RH的钢球磨损为2×10-5〜4×10-5mm3，通过俄歇电子光谱法测定的表面C / ​​Fe比为50〜100，磁性层表面和SUS棒之间的摩擦系数 8〜10nm的粗糙度为0.2〜0.3。

公开(公告)号：US20010003630A1

公开(公告)日：2001-06-14

申请号：US09052033

申请日：1998-03-30

Applicant: MASASHI AONUMA, et al

Inventor： MASASHI AONUMA ,  SHINJI SAITO ,  HITOSHI NOGUCHI ,  NOBUO YAMAZAKI

IPC: G11B005/706

CPC classification number: G11B5/70621 ,  G11B5/70 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/25 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/265

Abstract: A magnetic recording medium is described, which comprises a support having thereon a magnetic layer comprising a ferromagnetic metal powder dispersed in a binder, which is a magnetic recording medium for recording signals of from 0.17 to 2 G bit/inch2 of areal recording density, wherein the coercive force of said magnetic layer is 1,800 Oe or more, said ferromagnetic metal powder comprises Fe and Co, and the atomic ratio of Al/(FenullCo) is from 3.0 to 15.4%.

Abstract translation: 描述了一种磁记录介质，其包括其上具有包含分散在粘合剂中的铁磁性金属粉末的磁性层的支撑体，该磁性层是用于记录0.17至2G位/英寸2的面积记录密度的信号的磁记录介质，其中 所述磁性层的矫顽力为1800Oe以上，所述强磁性金属粉末含有Fe和Co，Al /（Fe + Co）的原子比为3.0〜15.4％。