Perpendicular magnetic recording medium and magnetic storage apparatus using the same
    4.
    发明授权
    Perpendicular magnetic recording medium and magnetic storage apparatus using the same 失效
    垂直磁记录介质及使用其的磁存储装置

    公开(公告)号:US06881504B2

    公开(公告)日:2005-04-19

    申请号:US10650809

    申请日:2003-08-29

    摘要: A large-capacity magnetic storage apparatus is disclosed, capable of performing ultra-high density magnetic recording of 50 gigabits or more per 1 square inch. In a perpendicular magnetic recording medium having a non-magnetic intermediate layer and a magnetic recording layer sequentially formed, the non-magnetic intermediate layer is composed of a layer having a face-centered cubic structure and containing a non-magnetic elements excluding Pt. Specifically, the intermediate layer mainly contains at least one selected from the group of elements constituted of Al, Cu, Rh, Pd, Ag, Ir and Au, and is composed of a film having a face-centered cubic (f. c. c.) structure. The magnetic recording layer contains at least Co, Cr and Pt, and is composed of a film having a hexagonal close-packed (h. c. p.) structure. More preferably, a non-magnetic h. c. p. intermediate layer is provided between the non-magnetic intermediate layer and the magnetic recording layer.

    摘要翻译: 公开了一种能够进行每1平方英寸50吉比特或更高的超高密度磁记录的大容量磁存储装置。 在具有顺序地形成非磁性中间层和磁记录层的垂直磁记录介质中,非磁性中间层由具有面心立方结构并包含除Pt以外的非磁性元素的层组成。 具体地说,中间层主要含有选自由Al,Cu,Rh,Pd,Ag,Ir和Au构成的元素组中的至少一种,并且由具有面心立方(c。c。)结构的膜组成。 磁记录层至少含有Co,Cr和Pt,并且由具有六方密堆积(h.p.P。)结构的膜组成。 更优选地,非磁性h。 C。 p。 中间层设置在非磁性中间层和磁记录层之间。

    Perpendicular magnetic recording medium and magnetic storage apparatus using the same

    公开(公告)号:US06638648B2

    公开(公告)日:2003-10-28

    申请号:US09941735

    申请日:2001-08-30

    IPC分类号: G11B566

    摘要: A large-capacity magnetic storage apparatus is disclosed, capable of performing ultra-high density magnetic recording of 50 gigabits or more per 1 square inch. In a perpendicular magnetic recording medium having a non-magnetic intermediate layer and a magnetic recording layer sequentially formed, the non-magnetic intermediate layer is composed of a layer having a face-centered cubic structure and containing a non-magnetic elements excluding Pt. Specifically, the intermediate layer mainly contains at least one selected from the group of elements constituted of Al, Cu, Rh, Pd, Ag, Ir and Au, and is composed of a film having a face-centered cubic (f. c. c.) structure. The magnetic recording layer contains at least Co, Cr and Pt, and is composed of a film having a hexagonal close-packed (h. c. p.) structure. More preferably, a non-magnetic h. c. p. intermediate layer is provided between the non-magnetic intermediate layer and the magnetic recording layer.

    Magnetic recording medium and magnetic storage device
    7.
    发明授权
    Magnetic recording medium and magnetic storage device 失效
    磁记录介质和磁存储装置

    公开(公告)号:US07115329B1

    公开(公告)日:2006-10-03

    申请号:US09914471

    申请日:1999-03-31

    IPC分类号: G11B5/66 G11B5/70

    摘要: A magnetic recording medium which comprises a substrate, an orientation control layer formed directly thereon, and a Co alloy magnetic layer formed thereon directly or indirectly with a Cr underlayer or Cr alloy underlayer interposed between them, the orientation control layer having an L10 crystal structure, L21 crystal structure, fcc crystal structure, or B2 (CsCl) crystal structure containing B, owing to this construction, has a high coercive force and a low noise level and is only slightly vulnerable to thermal fluctuation. A magnetic storage device having a magnetic recording medium, a driver to turn said magnetic recording medium in the recording direction, a magnetic head including a recording element and a read-back element, means to move the magnetic head relative to the magnetic recording medium, and a record-read signal processing means to perform waveform processing on input signals to and output signals from the magnetic head, uses this magnetic recording medium and has a magnetoresistive effect read-back element in its magnetic head. This magnetic storage device has a recording density in excess of 3 Gbit/in2.

    摘要翻译: 一种磁记录介质,包括基板,直接形成的取向控制层,以及直接或间接地形成在其间插入有Cr底层或Cr合金底层的Co合金磁性层,所述取向控制层具有L10晶体结构, 由于这种结构,含有B的L21晶体结构,fcc晶体结构或B2(CsCl)晶体结构具有高的矫顽力和低的噪声水平,并且仅稍微易受热波动的影响。 一种具有磁记录介质的磁存储装置,在记录方向上转动所述磁记录介质的驱动器,包括记录元件和回读元件的磁头,用于使磁头相对于磁记录介质移动的装置, 以及记录读取信号处理装置,用于对输入信号进行波形处理并输出来自磁头的信号,使用该磁记录介质并在其磁头中具有磁阻效应回读元件。 该磁存储装置的记录密度超过3Gbit / in 2。

    Magnetic recording medium and magnetic recording system using such a
magnetic recording medium
    9.
    发明授权
    Magnetic recording medium and magnetic recording system using such a magnetic recording medium 失效
    使用这种磁记录介质的磁记录介质和磁记录系统

    公开(公告)号:US6080476A

    公开(公告)日:2000-06-27

    申请号:US048167

    申请日:1998-03-25

    摘要: It is an object of the present invention to provide a magnetic recording medium which has 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 Ku.multidot.v/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.

    摘要翻译: 本发明的目的是提供一种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的磁性晶粒或非晶磁性颗粒 磁性晶粒的平均晶粒尺寸和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时,分别由磁各向异性常数Ku的乘积产生的Kuxv / kT值 并且通过玻尔兹曼常数k和绝对温度T的乘积将磁性粒子的体积v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。

    Multi-layered magnetic recording medium and magnetic recording system
employing the same
    10.
    发明授权
    Multi-layered magnetic recording medium and magnetic recording system employing the same 失效
    多层磁记录介质和采用该磁记录介质的磁记录系统

    公开(公告)号:US5723198A

    公开(公告)日:1998-03-03

    申请号:US258923

    申请日:1994-06-13

    IPC分类号: G11B5/66

    摘要: In a magnetic recording system including magnetic recording media, a rotation driving unit for driving these magnetic recording media, read/write magnetic heads, driving apparatus for driving these read/write magnetic heads, and a read/write signal processing apparatus, a reading portion of the respective magnetic heads is arranged by a magnetoresistive head. The magnetic recording media are constructed of multi-layered magnetic media having a plurality of magnetic layers fabricated directly, or via underlayers on a non-magnetic disk substrate, and of non-magnetic intermediate layers arranged among these non-magnetic layers. Furthermore, one coercivity which is measured by applying a magnetic field along a circumferential direction of the magnetic recording media, is selected to be larger than the other coercivity which is measured by applying a magnetic field along a radial direction of the magnetic recording media, so that a higher signal-to-noise ratio is achieved, as compared with that of the conventional magnetic recording system. Since the thickness of the non-magnetic intermediate layers is smaller than or equal to 5 nm, and also the total layer is smaller than or equal to 5 nm, and also the total layer number of the plural magnetic layers is selected to be odd, better characteristics can be achieved. Accordingly, since the MTBF (Mean Time Before Failure) is longer than or equal to 0.15 million hours with high recording density, and the disk substrate and the magnetic head sliders can be mounted at high packaging density, a compact and high-capacity magnetic recording system can be obtained.

    摘要翻译: 在包括磁记录介质的磁记录系统中,用于驱动这些磁记录介质的旋转驱动单元,读/写磁头,用于驱动这些读/写磁头的驱动装置以及读/写信号处理装置,读/ 相应的磁头由磁阻头安排。 磁记录介质由具有直接制造的多个磁性层或通过非磁盘基板上的底层以及布置在这些非磁性层之间的非磁性中间层的多层磁性介质构成。 此外,通过沿着磁记录介质的圆周方向施加磁场来测量的一个矫顽力被选择为大于通过沿着磁记录介质的径向方向施加磁场而测量的其他矫顽力,因此, 与常规磁记录系统相比,实现了更高的信噪比。 由于非磁性中间层的厚度小于或等于5nm,并且总层小于或等于5nm,并且多个磁性层的总层数也被选择为奇数, 可以实现更好的特性。 因此,由于MTBF(平均故障间隔时间)长于或等于0.15万小时,具有高记录密度,并且盘基板和磁头滑块可以以高封装密度安装,紧凑且高容量的磁记录 系统可以得到。