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1.发明授权公开(公告)号：US06667116B1
公开(公告)日：2003-12-23
申请号：US09559955
申请日：2000-04-27
IPC分类号： G11B566
CPC分类号： G11B5/7325 , G11B5/65 , G11B5/8404 , Y10S428/90 , Y10T428/265
摘要： A magnetic recording medium which includes a non-magnetic base layer having layered upon it, in sequence, a non-magnetic middle layer and a magnetic layer. The magnetic layer has ferromagnetic crystal grains surrounded by non-magnetic grain boundaries. The non-magnetic middle layer is formed of a non-magnetic oxide or nitride, and is disposed between the non-magnetic base layer and the magnetic layer. The non-magnetic oxide or nitride in the middle layer forms a fine, island-like film. At the time of film formation of the granular magnetic layer on the middle layer, this island-like film performs stationing for the ferromagnetic crystal grains and the growth nucleus for the non-magnetic grain boundary. As a result, fine dispersion of the ferromagnetic crystal grains in the granular magnetic layer is hastened, and a high coercivity is obtained even with a small Pt composition ratio. The available reduction in Pt composition ratio reduces the cost of the magnetic recording medium. Controlling the film formation conditions to which the non-magnetic middle layer is exposed controls the dispersion structure and the like of the magnetic crystal grains in the magnetic layer. This, in turn, controls the magnetic properties and the electromagnetic conversion properties of the magnetic recording medium.
摘要翻译： 一种磁记录介质，包括依次层叠有非磁性基层的非磁性中间层和磁性层。 磁性层具有由非磁性晶界包围的铁磁性晶粒。 非磁性中间层由非磁性氧化物或氮化物形成，并且设置在非磁性基底层和磁性层之间。 中间层中的非磁性氧化物或氮化物形成细的岛状膜。 在中间层上形成粒状磁性层时，该岛状膜对铁磁性晶粒和非磁性晶界的生长核进行固定。 结果，加速了粒状磁性层中铁磁性晶粒的微细分散，即使Pt组成比小，也能获得高的矫顽力。 Pt组成比的有效降低降低了磁记录介质的成本。 控制非磁性中间层露出的成膜条件控制磁性层中磁性晶粒的分散结构等。 这又控制磁记录介质的磁特性和电磁转换特性。
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公开(公告)号：US07205020B2
公开(公告)日：2007-04-17
申请号：US10757901
申请日：2004-01-14
IPC分类号： B05D5/12
CPC分类号： G11B5/66 , G11B5/84 , Y10T428/1259 , Y10T428/12611 , Y10T428/12861 , Y10T428/12868
摘要： A magnetic recording medium has a non-magnetic under-layer, a magnetic layer, a protective film and a liquid lubricant layer sequentially laminated on a non-magnetic substrate. The magnetic layer has a multi-layer structure laminated with two or more magnetic layer components, each of the magnetic layer components having ferromagnetic grains and non-magnetic grain boundaries surrounding the grain. The resulting magnetic recording medium has a granular magnetic layer exhibiting very high Hc accompanying high density of magnetic recording, while decreasing the amount of platinum needed for attaining the high Hc, and reducing media noise accompanying the high recording density.
摘要翻译： 磁记录介质具有顺序层叠在非磁性基板上的非磁性底层，磁性层，保护膜和液体润滑剂层。 磁性层具有层叠有两层以上的磁性层成分的多层结构，所述磁性层成分各自具有铁磁性粒子和包围该粒子的非磁性晶界。 所得磁记录介质具有伴随高记录密度显示出非常高的Hc的颗粒磁性层，同时减少获得高Hc所需的铂量，并且降低伴随高记录密度的介质噪声。
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公开(公告)号：US07183013B2
公开(公告)日：2007-02-27
申请号：US10764813
申请日：2004-01-26
CPC分类号： G11B5/7325 , G11B5/65 , G11B5/656 , G11B5/8404
摘要： A nonmagnetic foundation layer is made to have a body-centered cubic crystal structure with a preferred crystal orientation plane being the bcc (110) plane. A nonmagnetic intermediate layer, provided between the foundation layer and a granular magnetic layer, has a hexagonal close-packed structure with the hcp (100) plane or the hcp (200) plane being the preferred orientation plane. Furthermore, the crystal lattice misfit amount between the nonmagnetic intermediate layer 3 and the granular magnetic layer is made to be not more than 10% for each of an a-axis and a c-axis. As a result, epitaxial growth of ferromagnetic crystals in the granular magnetic layer, which has an hcp structure, is promoted, and hence the crystallinity of the magnetic layer is increased, and thus it becomes possible to simultaneously realize an increase in coercivity and a reduction in noise. Depositing the layers on an unheated substrate yields reduces manufacturing costs.
摘要翻译： 将非磁性基础层制成具有体心立方晶体结构，其中优选的晶体取向平面是bcc（110）面。 设置在基础层和粒状磁性层之间的非磁性中间层具有hcp（100）面或hcp（200）面为优选取向面的六方密堆积结构。 此外，非磁性中间层3和粒状磁性层之间的晶格失配量对于a轴和c轴分别为10％以下。 结果，促进了具有hcp结构的粒状磁性层中的铁磁晶体的外延生长，因此磁性层的结晶度增加，因此可以同时实现矫顽力的提高和还原 在噪音 将层沉积在未加热的基底上会降低制造成本。
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公开(公告)号：US07183011B2
公开(公告)日：2007-02-27
申请号：US10346838
申请日：2003-01-17
IPC分类号： G11B5/64
CPC分类号： G11B5/732 , G11B5/7325
摘要： A magnetic recording medium for perpendicular magnetic recording system includes a nonmagnetic substrate and layers sequentially laminated on the substrate. The layers include a seed layer comprised of a metal or an alloy with a face centered cubic crystal structure, a nonmagnetic underlayer of a metal or an alloy with a hexagonal closest packed crystal structure, a magnetic layer having a granular structure including ferromagnetic crystalline grains with a hexagonal closest packed structure and nonmagnetic grain boundary region of mainly oxide surrounding the crystalline grains, a protective layer, and a liquid lubricant layer.
摘要翻译： 用于垂直磁记录系统的磁记录介质包括非磁性衬底和顺序层压在衬底上的层。 这些层包括由金属或具有面心立方晶体结构的合金构成的种子层，金属的非磁性底层或具有六方最接近的堆积晶体结构的合金，具有包含铁磁性晶粒的粒状结构的磁性层， 主要包围晶粒的氧化物的六方最密堆积结构和非磁性晶界区域，保护层和液体润滑剂层。
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5.发明授权公开(公告)号：US06794028B2
公开(公告)日：2004-09-21
申请号：US10227621
申请日：2002-08-23
IPC分类号： G11B566
CPC分类号： G11B5/851 , G11B5/66 , Y10S428/90 , Y10T428/24975
摘要： A perpendicular magnetic recording medium has a granular magnetic layer and a nonmagnetic underlayer of a metal or an alloy having a hexagonal closest-packed (hcp) crystal structure. A seed layer of a metal or an alloy of a face-centered cubic (fcc) crystal structure is provided under the nonmagnetic underlayer. Such a perpendicular magnetic recording medium exhibits excellent magnetic characteristics even when the thickness of the underlayer or the total thickness of the underlayer and the seed layer is very thin. Excellent magnetic characteristics can be obtained even when of the substrate is not preheated. Accordingly, a nonmagnetic substrate, such as a plastic resin can be employed to reduce the manufacturing cost.
摘要翻译： 垂直磁记录介质具有颗粒状磁性层和具有六方密堆积（hcp）晶体结构的金属或合金的非磁性底层。 在非磁性底层下方设置面心立方（fcc）晶体结构的金属种子层或合金。 即使当底层的厚度或底层和种子层的总厚度非常薄时，这种垂直磁记录介质也表现出优异的磁特性。 即使在未预热基板的情况下也能获得良好的磁特性。 因此，可以采用塑料树脂等非磁性基板来降低制造成本。
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公开(公告)号：US06673475B2
公开(公告)日：2004-01-06
申请号：US09976248
申请日：2001-10-11
IPC分类号： G11B566
CPC分类号： G11B5/732 , G11B5/66 , G11B5/7325 , Y10S428/90 , Y10T428/265
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US06589669B2
公开(公告)日：2003-07-08
申请号：US09791949
申请日：2001-02-23
申请人： Hiroyuki Uwazumi , Tadaaki Oikawa
发明人： Hiroyuki Uwazumi , Tadaaki Oikawa
IPC分类号： G11B566
CPC分类号： G11B5/7325 , G11B5/656 , G11B5/851 , Y10S428/90 , Y10T428/12854 , Y10T428/265
摘要： A magnetic recording medium according to the invention includes a plastic substrate, a non-magnetic under-layer on the substrate, a magnetic layer including cobalt on the under-layer, a protective film on the magnetic layer, and a liquid lubricant layer on the protective film. The under-layer is composed of a chromium alloy having a body centered cubic lattice structure, and containing at least one element selected from the group consisting of Zr, Nb, Mo, Ru and Pd in a total amount of at least 15 at %, or containing at least one element selected from the group consisting of Hf, Ta, W, Re, Pt and Au in a total amount of at least 10 at %. The amount of cobalt dissolved out of the magnetic layer is limited by performing sputtering deposition of at least the magnetic layer at low pressures of argon.
摘要翻译： 根据本发明的磁记录介质包括塑料基板，在基板上的非磁性底层，在下层上包括钴的磁性层，磁性层上的保护膜，以及液体润滑剂层 保护膜。 底层由体积为立方晶格结构的铬合金构成，并且含有至少一种选自Zr，Nb，Mo，Ru和Pd中的至少一种元素，总量至少为15原子％ 或含有至少一种选自Hf，Ta，W，Re，Pt和Au的元素，总量至少为10原子％。 通过在低压氩气下进行至少磁性层的溅射沉积来限制从磁性层中溶出的钴的量。
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公开(公告)号：US08323808B2
公开(公告)日：2012-12-04
申请号：US11032691
申请日：2005-01-10
申请人： Osamu Kitakami , Yutaka Shimada , Satoshi Okamoto , Takehito Shimatsu , Hajime Aoi , Hiroaki Muraoka , Yoshihisa Nakamura , Hiroyuki Uwazumi , Tadaaki Oikawa
发明人： Osamu Kitakami , Yutaka Shimada , Satoshi Okamoto , Takehito Shimatsu , Hajime Aoi , Hiroaki Muraoka , Yoshihisa Nakamura , Hiroyuki Uwazumi , Tadaaki Oikawa
IPC分类号： G11B5/66
摘要： There is provided a perpendicular magnetic recording medium according to which both the thermal stability of the magnetization is good and writing with a magnetic head is easy, and moreover the SNR is improved. In the case of a perpendicular magnetic recording medium comprising a nonmagnetic substrate 1, and at least a nonmagnetic underlayer 2, a magnetic recording layer 3 and a protective layer 4 formed in this order on the nonmagnetic substrate 1, the magnetic recording layer 3 comprises a low Ku region 31 layer having a perpendicular magnetic anisotropy constant (Ku value) of not more than 1×105 erg/cm3, and a high Ku region 32 layer having a Ku value of at least 1×106 erg/cm3. Moreover, the magnetic recording layer 3 is made to have therein nonmagnetic grain boundaries that contain a nonmagnetic oxide and magnetically isolate crystal grains, which are made of a ferromagnetic metal, from one another.
摘要翻译： 提供了一种垂直磁记录介质，根据该磁记录介质，磁化的热稳定性都很好，并且用磁头进行写入容易，此外SNR提高。 在包括非磁性基板1和至少一个非磁性底层2，在非磁性基板1上依次形成的磁记录层3和保护层4的垂直磁记录介质的情况下，磁记录层3包括 具有不大于1×105erg / cm3的垂直磁各向异性常数（Ku值）的低Ku区31层和Ku值至少为1×106erg / cm3的高Ku区32层。 此外，使磁记录层3具有包含非磁性氧化物的非磁性晶界，并且将由铁磁性金属制成的晶粒彼此磁分离。
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9.发明授权公开(公告)号：US07147942B2
公开(公告)日：2006-12-12
申请号：US10314907
申请日：2002-12-09
摘要： The quantity of oxide contained in a magnetic layer is controlled to control the crystal grains and the segregation structure for ensuring low noise characteristic in a granular magnetic layer of a perpendicular magnetic recording medium. The granular magnetic layer consists of ferromagnetic crystal grains and a nonmagnetic grain boundary region mainly of an oxide surrounding the ferromagnetic crystal grains. The perpendicular magnetic recording medium has a nonmagnetic underlayer composed of a metal or alloy having hexagonal closest-packed crystal structure. The ferromagnetic crystal grain is composed of an alloy containing at least cobalt and platinum. The volume proportion of the nonmagnetic grain boundary region mainly of the oxide falls within a range of 15% to 40% of the volume of the total magnetic layer.
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10.发明授权公开(公告)号：US07067206B2
公开(公告)日：2006-06-27
申请号：US10227622
申请日：2002-08-23
CPC分类号： G11B5/732 , G11B5/7325 , G11B5/851
摘要： A perpendicular magnetic recording medium has a granular magnetic layer and a nonmagnetic underlayer of a metal or an alloy having a hexagonal close packed (hcp) crystal structure. A seed layer of a metal or an alloy of a face-centered cubic (fcc) crystal structure is provided under the nonmagnetic underlayer. Such a perpendicular magnetic recording medium exhibits excellent magnetic characteristics even when the thickness of the underlayer or the total thickness of the underlayer and the seed layer is very thin. Excellent magnetic characteristics can be obtained even when of the substrate is not preheated. Accordingly, a nonmagnetic substrate, such as a plastic resin can be employed to reduce the manufacturing cost.
摘要翻译： 垂直磁记录介质具有颗粒磁性层和具有六方密堆积（hcp）晶体结构的金属或合金的非磁性底层。 在非磁性底层下方设置面心立方（fcc）晶体结构的金属种子层或合金。 即使当底层的厚度或底层和种子层的总厚度非常薄时，这种垂直磁记录介质也表现出优异的磁特性。 即使在未预热基板的情况下也能获得良好的磁特性。 因此，可以采用塑料树脂等非磁性基板来降低制造成本。
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