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公开(公告)号：US07348077B2
公开(公告)日：2008-03-25
申请号：US10930755
申请日：2004-09-01
申请人： Enji Fujita , Hideaki Yamanaka , Tsuyoshi Onuma , Satoshi Matsunuma , Akira Yano , Tetsunori Koda , Katsusuke Shimazaki
发明人： Enji Fujita , Hideaki Yamanaka , Tsuyoshi Onuma , Satoshi Matsunuma , Akira Yano , Tetsunori Koda , Katsusuke Shimazaki
CPC分类号： G11B5/66 , G11B5/656 , G11B5/667 , G11B5/732 , G11B5/7325
摘要： A magnetic recording medium based on the perpendicular magnetic recording system includes a substrate; a back layer which is formed on the substrate and which is formed of a soft magnetic material; an in-plane magnetized layer which is formed on the back layer and which has in-plane magnetization; and a recording layer which is formed on the in-plane magnetized layer and which has perpendicular magnetization, wherein the in-plane magnetized layer has a coercivity in an in-plane direction larger than a magnetic field generated by residual magnetization in a perpendicular direction of the recording layer. The influence on the reproduction output, caused by the mirror image effect of the soft magnetic back layer is reduced in wide range recording densities, thereby improving the resolution by decreasing the difference between the reproduction outputs of the magnetic recording medium at the low recording density and at the high recording density.
摘要翻译： 基于垂直磁记录系统的磁记录介质包括基板; 背衬层，其形成在所述基板上并且由软磁性材料形成; 面内磁化层，其形成在背层上并具有面内磁化; 以及形成在所述面内磁化层上并且具有垂直磁化的记录层，其中所述面内磁化层的面内方向的矫顽力大于在垂直方向上的残余磁化产生的磁场的矫顽力 录音层。 在宽范围的记录密度下，由软磁背层的镜像效果引起的对再现输出的影响减小，从而通过将低记录密度的磁记录介质的再现输出与 在高记录密度。
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2.发明授权公开(公告)号：US07226674B2
公开(公告)日：2007-06-05
申请号：US10765049
申请日：2004-01-28
摘要： A magnetic recording medium based on the perpendicular magnetic recording system has a substrate which is formed of a non-magnetic material, a soft magnetic back layer which is formed of a soft magnetic material and which is formed on the substrate, an underlayer which is formed on the soft magnetic back layer, and a recording layer which is formed of an alloy magnetic material which is mainly composed of CoPtCr and contains an oxide, and which is formed on the underlayer. The recording layer is formed of two or more magnetic layers having different oxide contents, and the layer, which is included in the two or more magnetic layers for constructing the recording layer and which is provided on a side nearest to the underlayer, has the highest oxide content in the recording layer. The magnetic recording medium has more excellent magnetic characteristics with less medium noise.
摘要翻译： 基于垂直磁记录系统的磁记录介质具有由非磁性材料形成的基板，由软磁性材料形成并形成在基板上的软磁性背层，形成的下层 以及由主要由CoPtCr组成并含有氧化物的合金磁性材料形成并形成在底层上的记录层。 记录层由具有不同氧化物含量的两个或更多个磁性层形成，并且包含在用于构造记录层的两个或更多个磁性层中并且设置在最靠近底层的一侧的层具有最高的 记录层中的氧化物含量。 磁记录介质具有更优异的磁特性，较少的中等噪声。
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公开(公告)号：US20050048321A1
公开(公告)日：2005-03-03
申请号：US10930755
申请日：2004-09-01
申请人： Enji Fujita , Hideaki Yamanaka , Tsuyoshi Onuma , Satoshi Matsunuma , Akira Yano , Tetsunori Koda , Katsusuke Shimazaki
发明人： Enji Fujita , Hideaki Yamanaka , Tsuyoshi Onuma , Satoshi Matsunuma , Akira Yano , Tetsunori Koda , Katsusuke Shimazaki
CPC分类号： G11B5/66 , G11B5/656 , G11B5/667 , G11B5/732 , G11B5/7325
摘要： A magnetic recording medium based on the perpendicular magnetic recording system includes a substrate; a back layer which is formed on the substrate and which is formed of a soft magnetic material; an in-plane magnetized layer which is formed on the back layer and which has in-plane magnetization; and a recording layer which is formed on the in-plane magnetized layer and which has perpendicular magnetization, wherein the in-plane magnetized layer has a coercivity in an in-plane direction larger than a magnetic field generated by residual magnetization in a perpendicular direction of the recording layer. The influence on the reproduction output, caused by the mirror image effect of the soft magnetic back layer is reduced in wide range recording densities, thereby improving the resolution by decreasing the difference between the reproduction outputs of the magnetic recording medium at the low recording density and at the high recording density.
摘要翻译： 基于垂直磁记录系统的磁记录介质包括基板; 背衬层，其形成在所述基板上并且由软磁性材料形成; 面内磁化层，其形成在背层上并具有面内磁化; 以及形成在所述面内磁化层上并且具有垂直磁化的记录层，其中所述面内磁化层的面内方向的矫顽力大于在垂直方向上的残余磁化产生的磁场的矫顽力 录音层。 在宽范围的记录密度下，由软磁背层的镜像效果引起的对再现输出的影响减小，从而通过将低记录密度的磁记录介质的再现输出与 在高记录密度。
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公开(公告)号：US06866948B2
公开(公告)日：2005-03-15
申请号：US10665016
申请日：2003-09-22
CPC分类号： G11B5/667 , G11B5/656 , G11B5/7325 , Y10S428/90 , Y10T428/12465 , Y10T428/12861 , Y10T428/265
摘要： A magnetic recording medium based on the perpendicular recording system, which has high coercivity and low medium noise, is provided by using an underlayer which has a thin film thickness and which makes it possible to improve the orientation of a recording layer. The magnetic recording medium based on the perpendicular recording system has the recording layer which is formed of a CoPtCr alloy magnetic film containing oxygen. The magnetic recording medium has such a structure that an adhesive layer 2, a soft magnetic back layer 3, the underlayer 4, the recording layer 5, and a protective layer 6 are successively stacked on a substrate 1. A CoCrRu film, which has a film thickness of 5 nm to 20 nm, is used as the underlayer for the recording layer formed of the CoPtCr alloy magnetic film containing oxygen. Thus, it is possible to improve the crystalline orientation of the recording layer with the underlayer having the thin film thickness.
摘要翻译： 通过使用具有薄膜厚度的底层并且可以改善记录层的取向，提供了基于具有高矫顽力和低中等噪声的垂直记录系统的磁记录介质。 基于垂直记录系统的磁记录介质具有由含有氧的CoPtCr合金磁性膜形成的记录层。 磁记录介质具有粘结剂层2，软磁性背层3，底层4，记录层5和保护层6依次层叠在基板1上的结构。一种CoCrRu膜，其具有 使用5nm〜20nm的膜厚作为由含有氧的CoPtCr合金磁性膜形成的记录层的底层。 因此，可以改善具有薄膜厚度的底层的记录层的结晶取向。
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5.发明授权公开(公告)号：US06863998B2
公开(公告)日：2005-03-08
申请号：US10307301
申请日：2002-12-02
IPC分类号： G11B5/64 , G11B5/65 , G11B5/667 , G11B5/73 , G11B5/738 , G11B5/851 , H01F10/16 , G11B5/66 , G11B5/70
CPC分类号： G11B5/667 , G11B5/653 , G11B5/7325 , G11B5/851 , Y10S428/90
摘要： A magnetic recording medium 100 comprises, on a substrate 1, a first orientation control layer 2, a second orientation control layer 4, a soft magnetic layer 6, a non-magnetic layer 8, a recording layer 12, and a carbon protective layer 14. The recording layer 12 is formed of an FePt ordered alloy phase which exhibits ferromagnetism and an FePt3 ordered alloy phase which exhibits paramagnetism. Accordingly, the magnetic coupling force, which acts between those of the FePt ordered alloy phase, is broken by the paramagnetic FePt3 ordered alloy phase. The magnetic interaction between those of the FePt ordered alloy phase is reduced, and thus the noise is reduced. Further, the high density recording can be performed, and the medium is excellent in thermal stability, because the FePt ordered alloy having high crystalline magnetic anisotropy is used for the recording layer 12.
摘要翻译： 磁记录介质100在基板1上包括第一取向控制层2，第二取向控制层4，软磁层6，非磁性层8，记录层12和碳保护层14 记录层12由显示铁磁性的FePt有序合金相和显示顺磁性的FePt 3有序合金相形成。 因此，作用于FePt有序合金相的磁耦合力被顺磁性FePt3有序合金相破坏。 FePt有序合金相的磁相互作用减小，噪声降低。 此外，可以进行高密度记录，并且由于具有高结晶磁各向异性的FePt有序合金用于记录层12，介质的热稳定性优异。
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6.发明授权公开(公告)号：US06994923B2
公开(公告)日：2006-02-07
申请号：US10460197
申请日：2003-06-13
申请人： Tetsunori Koda , Akira Yano , Enji Fujita , Tsuyoshi Onuma , Satoshi Matsunuma
发明人： Tetsunori Koda , Akira Yano , Enji Fujita , Tsuyoshi Onuma , Satoshi Matsunuma
摘要： A magnetic recording medium in which the medium noise is reduced and information can be recorded at a high S/N level, and a method for producing the magnetic recording medium are provided. A magnetic recording apparatus, which is excellent in thermal stability and which makes it possible to perform the high density recording, is provided. When films are formed for the magnetic recording medium based on the perpendicular magnetic recording method, the content of B in a seed layer is made sufficiently larger than the content of B in a recording layer. Accordingly, B is diffused from the seed layer to the recording layer to facilitate the segregation of B at the crystal grain boundary in the recording layer. Thereby, the magnetic interaction between the crystal grains in the recording layer is further reduced. Thus, it is possible to greatly reduce the transition noise.
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公开(公告)号：US06846583B2
公开(公告)日：2005-01-25
申请号：US10356465
申请日：2003-02-03
IPC分类号： H05K5/02 , G11B5/64 , G11B5/65 , G11B5/667 , G11B5/73 , G11B5/851 , H05K5/03 , H05K7/18 , H05K7/20 , G11B5/66 , B32B15/00 , G11B5/70 , H01J1/00
CPC分类号： G11B5/667 , G11B5/65 , G11B5/656 , G11B5/7325 , G11B5/851 , Y10S428/90 , Y10T428/12465 , Y10T428/12854
摘要： A magnetic recording medium comprises a magnetic recording layer 63 which is formed by using an ordered alloy containing B on a substrate 1 containing an amorphous component. A part of B in the ordered alloy is segregated in a grain boundary, and thus the magnetic interaction, which acts between magnetic grains, can be reduced. Accordingly, it is possible to form fine and minute magnetic domains in the magnetic recording layer 63, and it is possible to reduce the medium noise as well. The temperature, at which the substrate is heated during the film formation of the magnetic recording layer 63, can be suppressed to be low, because the ordering temperature for the ordered alloy containing B is lower than those of ordered alloys not containing B. Therefore, it is possible to use a substrate made of glass which is suitable for the mass production. The magnetic recording layer 63 is also excellent in thermal stability because of the use of the ordered alloy having high magnetic anisotropy. According to the present invention, it is possible to provide the magnetic recording medium for high density recording which is excellent in thermal stability and which involves low medium noise.
摘要翻译： 磁记录介质包括磁记录层63，磁记录层63通过在含有非晶成分的基板1上使用含有B的有序合金而形成。 有序合金中的B的一部分在晶界中分离，因此可以减小在磁性颗粒之间作用的磁相互作用。 因此，可以在磁记录层63中形成精细和微小的磁畴，并且也可以降低介质噪声。 由于含有B的有序合金的有序温度低于不含B的有序合金的排序温度，所以在磁记录层63的成膜期间加热基板的温度可以被抑制得较低。因此， 可以使用适合于批量生产的玻璃制的基板。 由于使用具有高磁各向异性的有序合金，磁记录层63的热稳定性也优异。 根据本发明，可以提供热稳定性优异且介质噪音低的高密度记录用磁记录介质。
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8.发明授权公开(公告)号：US06893746B1
公开(公告)日：2005-05-17
申请号：US10111608
申请日：2000-10-30
申请人： Fumiyoshi Kirino , Norio Ohta , Kouichirou Wakabayashi , Teruaki Takeuchi , Harumi Hieida , Masaki Sekine , Hiroyuki Awano , Akira Yano , Satoshi Matsunuma , Nobuyuki Inaba , Tetsunori Koda
发明人： Fumiyoshi Kirino , Norio Ohta , Kouichirou Wakabayashi , Teruaki Takeuchi , Harumi Hieida , Masaki Sekine , Hiroyuki Awano , Akira Yano , Satoshi Matsunuma , Nobuyuki Inaba , Tetsunori Koda
CPC分类号： G11B5/65 , G11B5/00 , G11B5/656 , G11B5/66 , G11B5/667 , G11B5/7325 , G11B5/74 , G11B5/82 , G11B2005/0002 , G11B2005/0005 , G11B2005/0021
摘要： A magnetic recording medium comprises an information-recording film and a ferromagnetic film on a substrate. The information-recording film is composed of, for example, an amorphous ferrimagnetic material having perpendicular magnetization. Further, the ferromagnetic film is composed of a magnetic material which has saturation magnetization larger than that of the information-recording film. Accordingly, the leak magnetic flux from the ferromagnetic film is larger than that from the information-recording film. The magnetic recording medium and a magnetic recording apparatus are obtained, which are excellent in thermal stability and which are preferred to perform super high density recording.
摘要翻译： 磁记录介质包括在基板上的信息记录膜和铁磁膜。 信息记录膜由例如具有垂直磁化的非晶铁磁材料构成。 此外，铁磁膜由具有比信息记录膜的饱和磁化强度大的饱和磁化强度的磁性材料构成。 因此，来自铁磁膜的泄漏磁通量大于来自信息记录膜的漏磁通量。 获得磁性记录介质和磁记录装置，其热稳定性优异，并且优选进行超高密度记录。
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公开(公告)号：US06924048B2
公开(公告)日：2005-08-02
申请号：US10413481
申请日：2003-04-15
申请人： Tetsuya Kanbe , Yuzuru Hosoe , Ichiro Tamai , Yoshio Takahashi , Kiwamu Tanahashi , Satoshi Matsunuma , Yoshihiro Shiroishi
发明人： Tetsuya Kanbe , Yuzuru Hosoe , Ichiro Tamai , Yoshio Takahashi , Kiwamu Tanahashi , Satoshi Matsunuma , Yoshihiro Shiroishi
CPC分类号： G11B5/70 , G11B5/714 , Y10S428/90
摘要： A magnetic storage device has a magnetic layer, the magnetic crystal grains of which are separated by a nonmagnetic phase. The typical crystal grain is in the approximate shape of a sphere or an ellipsoid. The thickness of the magnetic crystal grains, which is in the direction perpendicular to the surface or the film, is smaller than that of the thickness of the magnetic film. The ratio of the coercive force, which is measured in the circumferential direction, to the coercive force, which is measured in the radial direction, (the orientation ratio of the coercive force), is larger than 1.0, but preferably nor greater than 3.0. Further, the area fraction of the magnetic grains having an extended axis within 30° from the circumferential direction is equal to or more than 45%.
摘要翻译： 磁存储装置具有磁性层，其磁性晶粒由非磁性相分离。 典型的晶粒呈球体或椭圆体的近似形状。 磁性晶粒的与表面或膜垂直的方向的厚度小于磁性膜的厚度。 在圆周方向上测量的矫顽力与径向测定的矫顽力（矫顽力的取向比）的比例大于1.0，优选为3.0以下。 此外，具有从圆周方向的30°以内的延伸轴的磁性颗粒的面积分数等于或大于45％。
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公开(公告)号：US06569545B1
公开(公告)日：2003-05-27
申请号：US09343721
申请日：1999-06-30
申请人： Tetsuya Kanbe , Yuzuru Hosoe , Ichiro Tamai , Yoshio Takahashi , Kiwamu Tanahashi , Satoshi Matsunuma , Yoshihiro Shiroishi
发明人： Tetsuya Kanbe , Yuzuru Hosoe , Ichiro Tamai , Yoshio Takahashi , Kiwamu Tanahashi , Satoshi Matsunuma , Yoshihiro Shiroishi
IPC分类号： G11B566
CPC分类号： G11B5/70 , G11B5/714 , Y10S428/90
摘要： A magnetic storage device has a recording density of over 5 gigabits per square inch. In the magnetic layer, the magnetic crystal grains of the granular structure are separated by a nonmagnetic phase. The typical crystal grain is in the approximate shape of a sphere or an ellipsoid. The thickness of the magnetic crystal grains, which is in the direction perpendicular to the surface of the film, is smaller than that of the thickness of the magnetic film. The ratio of the coercive force which is measured in the circumferential direction to the coercive force which is measured in the radial direction, which is the orientation ratio of the coercive force, is larger than 1.0, but preferably not greater than 3.0. Further, the area fraction of the magnetic grains having an extended axis within 30° from the circumferential direction is equal to or more than 45%.
摘要翻译： 磁存储装置具有超过5千兆比特每平方英寸的记录密度。 在磁性层中，粒状结构的磁性晶粒被非磁性相分离。 典型的晶粒呈球体或椭圆体的近似形状。 在与膜表面垂直的方向上的磁性晶粒的厚度小于磁性膜的厚度。 在圆周方向上测量的矫顽力与作为矫顽力的取向比的径向测定的矫顽力的比例大于1.0，优选为3.0以下。 此外，具有从圆周方向的30°以内的延伸轴的磁性颗粒的面积分数等于或大于45％。
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