公开(公告)号：WO1991016705A1

公开(公告)日：1991-10-31

申请号：PCT/US1991002642

申请日：1991-04-17

Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY

Inventor： MASSACHUSETTS INSTITUTE OF TECHNOLOGY ,  HENDERSON, Laura, J. ,  AVERBACH, Benjamin, L. ,  O'HANDLEY, Robert, C.

IPC: G11B05/66

CPC classification number: C01G49/06 ,  C01P2004/03 ,  C01P2004/62 ,  C01P2004/82 ,  C01P2006/42 ,  G11B5/68 ,  G11B5/851 ,  Y10S428/90

Abstract: A mixture (10) including at least one iron oxide and a non-magnetic matrix material is melted (13) or vaporized and then heat is rapidly removed (12) from the material. The resulting magnetic oxide precipitates are densely packed in the non-magnetic matrix (16). The precipitates have a narrow particle size distribution which results in a high signal-to-noise ratio when the oxides are used for magnetic recording purposes. The non-magnetic matrix can be removed to yield homogeneous, small particle iron oxide containing magnetic powder. Alternatively, the non-magnetic matrix/iron oxide material can be processed to yield a shaped recording medium.

公开(公告)号：WO1999031656A1

公开(公告)日：1999-06-24

申请号：PCT/JP1997004586

申请日：1997-12-12

Applicant: HITACHI, LTD. ,  DAVID, Djulianto Djayaprawira ,  ISHIKAWA, Akira ,  KOJIMA, Shuuichi ,  MATSUDA, Yoshibumi ,  YAHISA, Yotsuo ,  SUZUKI, Hiroyuki

Inventor： HITACHI, LTD.

IPC: G11B05/66

CPC classification number: G11B5/012

Abstract: The ratio BrOR of the residual magnetic flux density in a circumferential direction to the residual magnetic flux density in a radial direction is 0.95 - 1.05 and the ratio HcOR of the coercive force in a circumferential direction to the coercive force in a radial direction is 1.05 - 1.2 in the substrate surface of a magnetic recording medium. Therefore, a high output resolution, a low medium noise and a high track recording density are simultaneously achieved in recording at a high line recording density. When a magnetic storage apparatus is constituted by using a high S/N magnetic recording medium like this, a magnetic disc apparatus which has a high surface recording density, is low in cost and small in size, and a large capacity and a high reliability can be provided.

Abstract translation: 圆周方向的剩余磁通密度与径向残留磁通密度的比率BrOR为0.95〜1.05，圆周方向的矫顽力的比率HcOR与径向的矫顽力的比值为1.05〜 1.2在磁记录介质的基板表面中。 因此，在高线路记录密度的记录中同时实现高输出分辨率，低中等噪声和高记录密度。 当通过使用这样的高S / N磁记录介质构成磁存储装置时，具有高表面记录密度的磁盘装置成本低，尺寸小，容量大，可靠性高 提供。

公开(公告)号：WO1997034295A1

公开(公告)日：1997-09-18

申请号：PCT/US1996020157

申请日：1996-12-23

Applicant: SEAGATE TECHNOLOGY

Inventor： SEAGATE TECHNOLOGY ,  CHEN, Ga-Lane ,  CHEN, Qixu

IPC: G11B05/66

CPC classification number: G11B5/66 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

Abstract: A magnetic recording medium having a high areal recording density of about 3 to about 20 Gb/in , an Mrt of about 0.30 to about 0.60 memu/cm , a coercivity greater than 2,500 Oersteds and a coercivity squareness of about 0.70 to about 0.95 is obtained by depositing one or more pairs of magnetic layers (32, 33, 35, 36) comprising a magnetically isotropic layer (33) directly on a magnetically anisotropic layer (32). Chromium intermediate layers (34) are employed to separate each pair of magnetically isotropic/anisotropic layers. In one embodiment, the magnetically anisotropic layer comprises a cobalt-based alloy containing chromium and tantalum and the magnetically isotropic layer comprises a cobalt-base layer containing chromium, platinum and tantalum.

Abstract translation: 具有约3至约20Gb / in 2的高面密度记录密度的磁记录介质，约0.3至约0.60logu / cm 2的Mrt，矫顽力大于2500奥斯特，矫顽力矩形度约为 通过将包含磁各向同性层（33）的一对或多对磁性层（32,33,35,36）直接沉积在磁各向异性层（32）上而获得0.70至约0.95。 铬中间层（34）用于分离每对磁各向同性/各向异性层。 在一个实施例中，磁各向异性层包括含有铬和钽的钴基合金，并且磁各向同性层包括含有铬，铂和钽的钴基层。

公开(公告)号：WO1997031370A1

公开(公告)日：1997-08-28

申请号：PCT/US1997002835

申请日：1997-02-24

Applicant: DENSITEK CORPORATION

Inventor： DENSITEK CORPORATION ,  LAIRSON, Bruce ,  LIU, Wen, Hong

IPC: G11B05/66

CPC classification number: G11B5/732 ,  G11B5/656 ,  G11B5/66 ,  Y10S428/90 ,  Y10S428/928 ,  Y10T428/12465 ,  Y10T428/12493 ,  Y10T428/12861 ,  Y10T428/12875 ,  Y10T428/24975 ,  Y10T428/265

Abstract: A recording medium (36) for data storage has a plurality of adjoining thin layers which share a crystalline grain structure (46, 48), the layers alternating between a magnetic cobalt alloy layer (40, 42) and a noble metal layer (37, 39, 41). The magnetic layer includes a nonmagnetic element having a tendency to segregate toward grain boundaries (43, 45, 47), so that adjacent grains are exchange isolated, lowering noise of the medium that otherwise occurs due to intragranular coupling. The nonmagnetic element may be C, Cr, W, V, or preferably T. The medium has an easy axis of magnetization perpendicular to the layers, affording stable high density data storage.

Abstract translation: 用于数据存储的记录介质（36）具有共享一个晶粒结构（46,48）的多个相邻的薄层，这些层在磁性钴合金层（40,42）和贵金属层（37,40）之间交替， 39，41）。 磁性层包括具有偏离晶界（43,45,47）的趋势的非磁性元件，使得相邻的晶粒被交换隔离，降低由于颗粒间耦合而另外发生的介质的噪声。 非磁性元件可以是C，Cr，W，V或优选T.介质具有垂直于层的容易的磁化轴，提供稳定的高密度数据存储。

公开(公告)号：WO1997007503A1

公开(公告)日：1997-02-27

申请号：PCT/US1996013316

申请日：1996-08-14

Applicant: CENSTOR CORP.

Inventor： CENSTOR CORP.

IPC: G11B05/66

CPC classification number: G11B5/72 ,  G11B5/3106 ,  G11B5/7325 ,  G11B5/8404 ,  Y10S428/90

Abstract: An operationally contacting hard disk drive system has reduced friction due to lower capillary adhesion between the disk surface (100) and a transducer in a substantially continuous sliding relationship with the surface. The disk surface has an array of protrusions (101) separated by generally flat recesses (102) that arise semispherically on a hard protective layer (104) that lies atop a magnetic medium layer (106), wherein each of those layers reflects the underlying texture layer (98) which is grown atop a silicon substrate (108), after bumps (102) have partially grown, yielding substantially flat sections (112) between the bumps (110). The surface roughness may increase in a radially graded fashion to compensate for the increased linear velocity and concomitant frictional power loss near the outer diameter of the disk. It is important that the uppermost reaches of the textured surface are smooth but not flat in order to obtain lasting low friction operation, which is accomplished by constructing the surface with a highesst approximately one percent having an average radius of curvature in a range between 2 microns and 100 microns. An area of the slider in apparent contact with the disk surface is preferably less than 1000 square microns, and a ratio between this nominal area and the mean to peak height is less than 0.3 meters. The slider may also include a substantial thickness of partially wetting materials having differing wear rates, or may alternatively be textured with deep grooves or materials having differing wear rates, in order to provide reduced frictional adhesion despite wear of the slider.

Abstract translation: 由于盘表面（100）和与表面基本上连续的滑动关系的换能器之间较低的毛细管粘附力，操作上接触的硬盘驱动系统减少了摩擦。 磁盘表面具有由通常平坦的凹部（102）分开的突起阵列（101），半平面的凹槽（102）出现在位于磁性介质层（106）的上方的硬质保护层（104）上半球形，其中这些层中的每一层反射下面的纹理 在凸起（102）部分生长之后，在凸起（110）之间产生基本上平坦的部分（112），其在硅衬底（108）的顶上生长的层（98）。 表面粗糙度可以以径向渐变的方式增加，以补偿在盘的外径附近增加的线速度和伴随的摩擦功率损耗。 重要的是，纹理表面的最上层是平滑的而不是平坦的，以便获得持久的低摩擦操作，这是通过以大约1％的高度构造具有平均曲率半径在2微米之间的范围来实现的 和100微米。 与盘表面明显接触的滑块的区域优选地小于1000平方微米，并且该标称面积与平均高度之间的比值小于0.3米。 滑块还可以包括具有不同磨损率的基本厚度的部分润湿材料，或者可选地，可以用深沟槽或具有不同磨损率的材料进行纹理化，以便尽管滑块的磨损来提供降低的摩擦粘附。

公开(公告)号：WO1997001164A1

公开(公告)日：1997-01-09

申请号：PCT/JP1996001732

申请日：1996-06-21

Applicant: NGK INSULATORS, LTD. ,  SUZUKI, Tomio ,  TAKEYA, Fuminori ,  ABE, Masahiro

Inventor： NGK INSULATORS, LTD.

IPC: G11B05/66

CPC classification number: G11B5/7315 ,  C03C10/0027 ,  C03C21/001 ,  C03C21/005 ,  G11B5/8404 ,  Y10T428/24355

Abstract: A magnetic disk substrate having the body made from glass, characterized by containing light-absorbing metal elements in at least the surface region of the substrate body and having a texture formed on the surface of the body. The metal elements are diffused in the surface region as metal ions or contained in the glass ingredients as metal oxides. Preferable examples of the glass include crystallized LiO2-Al2O3-SiO2 glasses, more particularly those composed of 65-85 wt.% SiO2, 8-15 wt.% Li2O, 2-8 wt.% Al2O3, 1-5 wt.% P2O5, and 1-10 wt.% ZrO2, and containing lithium disilicate (LiO2.2SiO2) as the principal crystal phase.

Abstract translation: 一种具有由玻璃制成的主体的磁盘基片，其特征在于，在所述基板主体的至少表面区域中含有光吸收金属元件，并具有形成在所述主体表面上的纹理。 金属元素作为金属离子在表面区域扩散或作为金属氧化物包含在玻璃成分中。 玻璃的优选实例包括结晶的LiO 2 -Al 2 O 3 -SiO 2玻璃，更特别的是由65-85重量％SiO 2，8-15重量％Li 2 O，2-8重量％Al 2 O 3，1-5重量％P 2 O 5 ，和1-10重量％的ZrO 2，并且含有二硅酸锂（LiO 2·2SiO 2）作为主要结晶相。

公开(公告)号：WO1995034888A1

公开(公告)日：1995-12-21

申请号：PCT/US1995007242

申请日：1995-06-09

Applicant: ELONEX TECHNOLOGIES, INC.

Inventor： ELONEX TECHNOLOGIES, INC. ,  KIKINIS, Dan

IPC: G11B05/66

CPC classification number: B42D25/369 ,  B42D2033/16 ,  G11B5/68

Abstract: A business card (11) has at least one magnetically codable strip (13) mounted on or in the card, codable to electrically store information relative to the purpose of the business card, such as phones, faxes, addresses, services, products, and so on. A coder-decoder (25) connectable to a general-purpose computer reads and writes information to and from the cards and to and from a database stored on a memory system of the computer. Apparatus is provided in one aspect of the invention for adding magnetic strips (13) to existing business cards.

Abstract translation: 名片（11）具有安装在卡上或卡中的至少一个可磁编码的条带（13），可编程以相对于名片的目的电存储信息，例如电话，传真，地址，服务，产品和 所以。 可连接到通用计算机的编码器解码器（25）从卡读取信息并从存储在计算机的存储器系统上的数据库读取信息。 在本发明的一个方面中提供了用于向现有名片添加磁条（13）的装置。

公开(公告)号：WO1995003603A1

公开(公告)日：1995-02-02

申请号：PCT/JP1994001184

申请日：1994-07-19

Applicant: TAKAHASHI, Migaku

IPC: G11B05/66

CPC classification number: G11B5/7325 ,  G11B5/65 ,  G11B5/656 ,  G11B5/851 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/265

Abstract: An inexpensive high-density recording medium which is increased in coercive force without using expensive ferromagnetic metallic layer. In a magnetic recording medium on the substrate of which a ferromagnetic metallic layer is formed on a substrate with a metallic underlying layer in between and which utilizes reversal of magnetization, the oxygen concentration in the ferromagnetic metallic layer is below 100 wt. ppm, and in addition, the oxygen concentration in the metallic base layer is also below 100 wt. ppm. In a method of manufacturing a magnetic recording medium on the substrate of which the metallic base layer and ferromagnetic metallic layer are successively formed by sputtering, the impurity concentration of Ar gas used for the formation of the layers is below 10 ppb. Before forming the metallic base layer, in addition, the surface of the substrate is cleaned by high-frequency sputtering using Ar gas the impurity concentration of which is 10 ppb and the surface section of the substrate is partially removed to a depthof 0.2-1 nm.

Abstract translation: 廉价的高密度记录介质，在不使用昂贵的铁磁金属层的情况下增加了矫顽力。 在基板上的磁记录介质中，在其上具有金属底层的基板上形成强磁性金属层，并且利用磁化反转，铁磁金属层中的氧浓度低于100重量％。 ppm，此外，金属基底层中的氧浓度也低于100重量％。 PPM。 在通过溅射连续形成金属基底层和强磁性金属层的基板上制造磁记录介质的方法中，用于形成层的Ar气体的杂质浓度低于10ppb。 在形成金属基层之前，此外，通过使用杂质浓度为10ppb的Ar气体并且将衬底的表面部分部分地去除到0.2-1nm的高压溅射来清洁衬底的表面 。

公开(公告)号：WO1998057324A1

公开(公告)日：1998-12-17

申请号：PCT/JP1997002017

申请日：1997-06-11

Applicant: HITACHI, LTD. ,  YAMANAKA, Kazusuke ,  YAMAMOTO, Tomoo ,  INABA, Nobuyuki ,  FUTAMOTO, Masaaki ,  IGARASHI, Masukazu ,  UESAKA, Yasutaroo

Inventor： HITACHI, LTD.

IPC: G11B05/66

CPC classification number: G11B5/656 ,  G11B5/012 ,  G11B5/3109 ,  G11B5/3967 ,  G11B5/64 ,  G11B2005/001

Abstract: A ferromagnetic metal thin film whose remanence coercive force has a temperature coefficient of 7 Oe/deg. - 12 Oe/deg. and has a temperature coefficient not larger than 1.7 x {(Ho - Hr)/T} (where Ho denotes the remanence coercive force when the influence of thermal fluctuation does not exist, Hr denotes the remanence coercive force and T denotes the absolute temperature) is used to reduce the medium noise at the time of reproduction and to suppress the temperature coefficient of the coercive force of a magnetic medium. A recording head whose magnetic pole is partially composed of the ferromagnetic metal thin film and a reproducing head in which a magnetoresistance effect device is used are combined to provide a magnetic disc apparatus which has a recording density not lower than 2 Gbit/in and can withstand an operation temperature of 0 - 60 DEG C.

Abstract translation: 一种强磁性金属薄膜，其剩磁矫顽力具有7Oe /度的温度系数。 - 12 Oe / deg 并且具有不大于1.7×{（Ho-Hr）/ T}的温度系数（其中，Ho表示当不存在热波动的影响时的剩磁矫顽力，Hr表示剩磁矫顽力，T表示绝对温度） 用于降低再现时的介质噪声并抑制磁介质的矫顽力的温度系数。 其磁极部分地由铁磁金属薄膜构成的记录头和使用磁阻效应装置的再现头被组合以提供具有不低于2Gbit / in 2的记录密度的磁盘装置， 并可承受0〜60℃的工作温度。

公开(公告)号：WO1998044490A1

公开(公告)日：1998-10-08

申请号：PCT/JP1997001090

申请日：1997-03-28

Applicant: TAKAHASHI, Migaku ,  NAKAI, Junichi

IPC: G11B05/66

CPC classification number: G11B5/7325 ,  G11B5/656 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854

Abstract: A magnetic recording medium having a high coercive force of a ferromagnetic metal layer, a high anisotropic magnetic field and/or normalized coercive force, and adaptable to high density recording. The magnetic recording medium comprises a substrate and a ferromagnetic metal layer containing at least Co and Cr formed thereon via a metallic underlying layer of Cr. Magnetic inversion is utilized for the recording. A region (1) which penetrates through the ferromagnetic metal layer and in which Cr is segregated are formed among the crystalline particles constituting the ferromagnetic metal layer. The Cr concentration in the intermediate portions of the region (1) in the direction of thickness of the ferromagnetic metal layer is smaller than that of the portions near the surface and near the metallic underlying layer. The crystalline particles of the ferromagnetic metal layer are constituted by a region (2) in which the Cr concentration increases toward the grain boundary and a region (3) which is formed at the center of the crystalline particle and whose Cr concentration is lower than that near the grain boundary. The maximum Cr concentration in the region (3) is smaller than the maximum Cr concentration in the region (2).

Abstract translation: 具有强磁性金属层矫顽力高的磁记录介质，高各向异性磁场和/或归一化矫顽力，并适用于高密度记录。 磁记录介质包括基底和通过Cr的金属下层至少含有至少包含Co和Cr的强磁性金属层。 磁反转用于记录。 在构成强磁性金属层的结晶粒子之间形成穿过强磁性金属层并且Cr分离的区域（1）。 在强磁性金属层的厚度方向上的区域（1）的中间部分的Cr浓度小于表面附近的部分附近和金属下层附近的Cr浓度。 强磁性金属层的结晶粒子由Cr浓度向晶界增加的区域（2）和形成在结晶粒子的中心且Cr浓度低于晶粒的中心的区域（3）构成。 靠近晶界。 区域（3）中的最大Cr浓度小于区域（2）中的最大Cr浓度。