公开(公告)号：US20020168547A1

公开(公告)日：2002-11-14

申请号：US10137398

申请日：2002-05-03

Applicant: Hitachi, Ltd.

Inventor： Tetsuya Kanbe ,  Yoshio Takahashi ,  Akira Ishikawa ,  Ichiro Tamai ,  Yuzuru Hosoe ,  Yoshifumi Matsuda ,  Kiwamu Tanahashi ,  Tomoo Yamamoto

IPC: G11B005/65

CPC classification number: G11B5/65 ,  G11B5/64 ,  G11B5/653 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854 ,  Y10T428/26 ,  Y10T428/265

Abstract: The present invention provides a magnetic recording medium having a magnetic layer deposited on a substrate through a single-layer underlayer or a multilayer-underlayer, the magnetic layer includes magnetic crystal grains having an acicular structure or amorphous magnetic particles, an average grain size of the magnetic grain and a grain-size dispersion normalized by the average grain size are less than 16 nm and less than 0.5, respectively, a value Kunullv/kT which results from dividing a product of a magnetic anisotropy constant Ku and a volume v of the magnetic grain by a product of a Boltzmann constant k and an absolute temperature T is selected to be greater than 60, and a film thickness of the magnetic layer falls within twice of the average grain size. Thus, there can be realized a magnetic recording system in which a media noise can be reduced, a high S/N and a low bit error rate can be obtained and which has a high recording density of 2 gigabits per one square inches and an MTBF (mean time between failure) of higher than 300000 hours.

Abstract translation: 本发明提供一种具有通过单层底层或多层下层沉积在基板上的磁性层的磁记录介质，该磁性层包括具有针状结构或无定形磁性颗粒的磁性晶粒，平均粒径为 磁性晶粒和由平均晶粒尺寸归一化的晶粒尺寸分散度分别小于16nm且小于0.5，由将磁各向异性常数Ku与体积v的积分开而产生的Ku.v / kT值 通过玻耳兹曼常数k和绝对温度T的乘积的磁性粒子选择为大于60，并且磁性层的膜厚度落在平均晶粒尺寸的两倍内。 因此，可以实现可以降低媒体噪声的磁记录系统，可以获得高S / N和低误码率，并且其具有高达2吉比特每平方英寸的高记录密度和MTBF （故障之间的平均时间）高于30万小时。

公开(公告)号：US20010012573A1

公开(公告)日：2001-08-09

申请号：US09733501

申请日：2000-12-08

Applicant: FUJITSU LIMITED

Inventor： Isatake Kaitsu ,  Hisateru Sato ,  Iwao Okamoto

IPC: G11B005/65

CPC classification number: G11B5/64

Abstract: A magnetic recording medium is provided which has ferromagnetic crystal grains having a uniform grain size which are successfully separated from each other. The magnetic recording medium comprises a non-magnetic substrate 1 and a recording layer 2 formed thereon, wherein the recording layer consists of at least one non-ferromagnetic material selected from the group consisting of non-magnetic materials and antiferromagnetic materials and a plurality of crystal grains 2null1 made of ferromagnetic material solid-insoluble with the non-ferromagnetic material which are dispersed in the non-ferromagnetic material. The recording layer has at least two phases, along the depth direction, with each phase having a different mean composition ratio of the ferromagnetic material to the non-ferromagnetic material from that or those of the adjacent phase or phases.

Abstract translation: 提供一种磁记录介质，其具有成功分离的具有均匀晶粒尺寸的铁磁晶粒。 磁记录介质包括非磁性基片1和形成在其上的记录层2，其中记录层由至少一种选自非磁性材料和反铁磁材料的非铁磁材料组成，并且多个晶体 由非铁磁材料固体不溶的铁磁材料制成的晶粒2-1分散在非铁磁材料中。 记录层沿着深度方向具有至少两个相位，每个相具有不同于铁磁材料与非铁磁材料的平均组成比值，或者相​​邻相或相的平均组成比。

公开(公告)号：US20010009727A1

公开(公告)日：2001-07-26

申请号：US09801955

申请日：2001-03-08

Applicant: FUJITSU LIMITED

Inventor： Hideyuki Akimoto ,  Chiaki Okuyama ,  Iwao Okamoto

IPC: G11B005/65

CPC classification number: G11B5/66 ,  Y10S428/90 ,  Y10T428/24942 ,  Y10T428/24975 ,  Y10T428/265

Abstract: A magnetic recording medium has a construction in which on a non-magnetic support member are successively stacked a seed layer made of a non-magnetic material that is mainly composed of Cr, a keeper layer made of an NiFe-type soft magnetic material, an intermediate layer made of a non-magnetic material that is mainly composed of Cr and a recording layer made of a magnetic material that is mainly composed of Co.

Abstract translation: 磁记录介质具有以下结构：在非磁性支撑构件上依次堆叠由主要由Cr构成的非磁性材料制成的种子层，由NiFe型软磁性材料制成的保持层， 由主要由Cr组成的非磁性材料制成的中间层和由主要由Co组成的磁性材料制成的记录层

公开(公告)号：US20030008176A1

公开(公告)日：2003-01-09

申请号：US10185728

申请日：2002-07-01

Inventor： Jun Koujima ,  Teruaki Santoki ,  Kenichi Nakata ,  Takanori Doi ,  Masaaki Maekawa ,  Kousaku Tamari

IPC: G11B005/65

CPC classification number: G11B5/653 ,  G11B5/851 ,  Y10T428/265

Abstract: A magnetic recording medium, comprising: a substrate; an underlayer formed on the substrate; and a spinel-type iron oxide thin film comprising maghemite as a main component formed on the underlayer, the spinel-type iron oxide thin film having a thickness (t) of 5 to 50 nm, being constituted by grains having an average grain size (D) of 5 to 30 nm, a standard deviation of grain sizes of not more than 4 nm and a ratio (D/t) of the average grain size (D) to the thickness (t) of less than 1.0, and exhibiting a coercive force of not less than 159 kA/m (2,000 Oe) and a coercive squareness ratio S* of not less than 0.5:1 in a longitudinal recording medium or a squareness ratio not less than 0.75:1 in a perpendicular recording medium. The magnetic recording medium exhibits a high coercive force and an excellent squareness.

Abstract translation: 一种磁记录介质，包括：基板; 形成在基板上的底层; 以及形成在下层上的磁赤铁矿作为主要成分的尖晶石型氧化铁薄膜，其特征在于，所述尖晶石型氧化铁薄膜的厚度（t）为5〜50nm，由平均粒径 D）为5〜30nm，晶粒尺寸不超过4nm的标准偏差和平均粒径（D）与厚度（t）的比（D / t）小于1.0，并且显示出 纵向记录介质中矫顽力不小于159kA / m（2,000Oe），矫顽方矩比S *不小于0.5:1，垂直记录介质中的矫顽力不小于0.75:1。 磁记录介质具有高的矫顽力和极好的矩形度。

公开(公告)号：US20020164501A1

公开(公告)日：2002-11-07

申请号：US10024497

申请日：2001-12-21

Inventor： Takashi Hikosaka

IPC: G11B005/65

CPC classification number: G11B5/64 ,  G11B2005/0029 ,  Y10S428/90

Abstract: Disclosed is a perpendicular magnetic recording medium having magnetic characteristics by which an anisotropic magnetic field Hk and a saturation magnetization Ms satisfy the requirement 2

Abstract translation: 公开了具有各向异性磁场Hk和饱和磁化强度Ms满足要求2

公开(公告)号：US20020098382A1

公开(公告)日：2002-07-25

申请号：US09859527

申请日：2001-05-18

Inventor： Seong-rae Lee ,  Young-keun Kim ,  Sang-hyun Yang

IPC: G11B005/65 ,  B32B003/02

CPC classification number: G11B5/653 ,  B32B15/04 ,  G11B5/00

Abstract: A magnetic recording media for improving information storage density by adding Zr to a FePt film used in an information storage unit is provided. In the magnetic recording media including an information recording means for recording information and an information storage means for storing the information magnetically recorded by the information recording means, the information storage means includes a FePt magnetic layer containing Zr on the substrate. Thus, the use of a FePtnullZr film provides an information storage media having fast phase transformation a high coercivity and a fine grain size compared to the use of a FePt film.

Abstract translation: 提供了一种用于通过向用于信息存储单元中的FePt膜添加Zr来提高信息存储密度的磁记录介质。 在包括用于记录信息的信息记录装置和用于存储由信息记录装置磁记录的信息的信息存储装置的磁记录介质中，信息存储装置包括在基板上含有Zr的FePt磁性层。 因此，与使用FePt膜相比，使用FePt-Zr膜提供了具有高矫顽力和细晶粒尺寸的快速相变的信息存储介质。

公开(公告)号：US20010003616A1

公开(公告)日：2001-06-14

申请号：US09225424

申请日：1999-01-05

Inventor： SEIICHI ONODERA ,  TETSUO SAMOTO ,  TAKAHIRO KAWANA

IPC: G11B005/65 ,  B32B005/16

CPC classification number: G11B5/64 ,  Y10T428/256

Abstract: A magnetic recording medium comprising a thin magnetic metal film of which the thickness and remanent magnetization are smaller than ever and optimized to match the characteristics of the MR read head used with the recording medium. The thin magnetic metal film is formed on a nonmagnetic substrate and has a remanent magnetization and film thickness product Mrnullnull of 1 to 5 memu/cm2. Owing to this product Mrnullnull, a signal recorded on the magnetic recording medium can be reproduced with no distortion in a region where the MR read head maintains its linearity.

Abstract translation: 一种磁记录介质，包括薄磁性金属膜，其厚度和剩余磁化强度比以前更小并且被优化以匹配与记录介质一起使用的MR读取头的特性。 薄磁性金属膜形成在非磁性基板上，并且具有1至5emu / cm 2的剩余磁化和膜厚度产品Mrdelta。 由于该产品Mr.delta，记录在磁记录介质上的信号可以在MR读取头保持其线性的区域中不变形地再现。

公开(公告)号：US20020187368A1

公开(公告)日：2002-12-12

申请号：US10133807

申请日：2002-04-26

Inventor： Yuuji Senzaki ,  Hiroshi Uchiyama ,  Takahiro Igari

IPC: G11B005/65

CPC classification number: G11B5/7325 ,  G11B5/656 ,  G11B5/851

Abstract: A magnetic recording medium having a high coercive force and a high signal to noise ratio suitable for use in a high density recording, and a method of manufacture thereof are provided, by using a resin substrate capable of processing approximately at room temperatures. A magnetic film mainly comprising ConullPtnullCr and including a silicon oxide is formed on the resin substrate wherein an amount of silicon element constituting the silicon oxide in terms of atomic percent relative to the ConullPtnullCr is 8 atomic % or more and 16 atomic % or less, thereby efficiently decreasing the inter-crystal interaction between crystal grains therein. Further, the magnetic film is formed on the substrate made of the resin in the non-heated state by sputtering in a sputtering chamber at a gas pressure of 0.133 Pa or more and 2.66 Pa or less.

Abstract translation: 通过使用能够在室温近似处理的树脂基板，提供了具有高矫顽磁力和适用于高密度记录的高信噪比的磁记录介质及其制造方法。 在树脂基板上形成主要包含Co-Pt-Cr并且包括氧化硅的磁性膜，其中以相对于Co-Pt-Cr的原子百分比构成氧化硅的硅元素的量为8原子％以上 和16原子％以下，从而有效地降低其中晶粒之间的晶体间相互作用。 此外，通过在溅射室中以0.133Pa以上且2.66Pa以下的气体压力，通过溅射在非加热状态的树脂制的基板上形成磁性膜。

公开(公告)号：US20020114975A1

公开(公告)日：2002-08-22

申请号：US09976248

申请日：2001-10-11

Inventor： Tadaaki Oikawa ,  Hiroyuki Uwazumi ,  Takahiro Shimizu ,  Naoki Takizawa

IPC: G11B005/66 ,  G11B005/65

CPC classification number: G11B5/732 ,  G11B5/66 ,  G11B5/7325 ,  Y10S428/90 ,  Y10T428/265

Abstract: A magnetic recording medium achieves excellent noise reduction by controlling the crystal orientation of a magnetic layer without thermal processing. The magnetic recording medium includes multiple layers laminated to a substrate. These layers include at least the magnetic layer and a non-magnetic under layer. The magnetic layer has a granular structure consisting of ferromagnetic grains with a hexagonal close-packed structure and non-magnetic grain boundaries composed mainly oxide or a nitride. The non-magnetic under-layer is a material having a body centered cubic crystal structure with a preferential orientation along a (200) plane parallel to a film surface of the under-layer.

Abstract translation: 通过控制磁性层的晶体取向而不进行热处理，磁记录介质实现了优异的降噪。 磁记录介质包括层压到基板上的多层。 这些层至少包括磁性层和非磁性底层。 磁性层具有由六方密堆积结构的铁磁性晶粒和主要由氧化物或氮化物构成的非磁性晶界组成的粒状结构。 非磁性底层是具有体心立方晶体结构的材料，其沿着平行于底层的膜表面的（200）平面具有优先取向。

公开(公告)号：US20020098381A1

公开(公告)日：2002-07-25

申请号：US09326240

申请日：1999-06-04

Inventor： KEVIN ROBERT COFFEY ,  JAMES KENT HOWARD ,  MICHAEL ANDREW PARKER

IPC: G11B005/65

CPC classification number: G11B5/7325 ,  G11B5/1278 ,  G11B5/65 ,  G11B5/82 ,  G11B5/851

Abstract: An alloy of tetragonal polycrystalline structure acts as a thin film magnetic medium. The medium can be for recording or sensing magnetic transitions representative of data and is of a thickness less than about 200 null, and has a coercivity in excess of about 2000 Oe. The film is in the L1o phase which is suitable for longitudinal recording and can be constituted by an alloy selected from cobalt or iron together with platinum or palladium. The film is formed by sputtering from a target and thereafter annealing the thin film and at a temperature in excess of about 500null C.

Abstract translation: 四方晶体结构的合金作为薄膜磁介质。 该介质可以用于记录或感测表示数据的磁性跃迁，并且具有小于约200埃的厚度，并且具有超过约2000Oe的矫顽力。 该膜处于适于纵向记录的L1o相中，并且可以由选自钴或铁以及铂或钯的合金构成。 该膜通过溅射从靶材形成，然后对薄膜进行退火并在超过约500℃的温度下进行。