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    • 31. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US5558945A
    • 1996-09-24
    • US360965
    • 1994-12-21
    • Shinji MiyazakiJiro YoshinariKoji Kobayashi
    • Shinji MiyazakiJiro YoshinariKoji Kobayashi
    • G11B5/66
    • G11B5/66Y10S428/90Y10S428/928Y10T428/12465Y10T428/1266Y10T428/12861Y10T428/24942Y10T428/24975
    • A magnetic recording medium having excellent electromagnetic characteristics, still characteristics and cupping, decreased rust generation and high durability, includes a non-magnetic substrate and a magnetic layer formed thereon by oblique deposition, the magnetic layer being composed of at least two ferromagnetic thin films, in which the ferromagnetic thin film of the lowest layer has a saturation magnetization of 300 emu/cc or less, a coercive force of 1000 Oe or less and a thickness of 300 to 1500 .ANG., the ferromagnetic thin layer of the uppermost layer has a saturation magnetization of 300 emu/cc or more, a coercive force of 1000 Oe or more and a thickness of 400 to 1500 .ANG., an average value (.theta.) of angles between growing directions of columnar crystalline particles constituting the ferromagnetic thin film of the lowest layer and a principal plane of the substrate ranges from 50 to 70 degrees, and an average value (.theta.) of angles between growing directions of columnar crystalline particles constituting the ferromagnetic thin film of the uppermost layer and the principal plane of the substrate ranges from 30 to 50 degrees.
    • 具有优异的电磁特性,静电特性和拔罐的磁记录介质,减少生锈和高耐久性,包括非磁性基板和通过倾斜沉积在其上形成的磁性层,该磁性层由至少两个铁磁性薄膜组成, 其中最低层的铁磁性薄膜具有300emu / cc以下的饱和磁化强度,1000Oe以下的矫顽力和300〜1500的厚度,最上层的铁磁性薄层具有饱和度 300emu / cc以上的磁化,1000Oe以上的矫顽力和400〜1500的厚度ANGSTROM,构成最低层的铁磁性薄膜的柱状结晶粒子的生长方向的平均值(θ) 并且衬底的主平面的范围为50至70度,并且生长方向之间的角度的平均值(θ) 构成最上层的铁磁性薄膜的柱状结晶粒子和基板的主面的范围为30〜50度。
    • 37. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US6042938A
    • 2000-03-28
    • US992088
    • 1997-12-17
    • Tsunehiko IkarashiMasahide KohnoShinji Miyazaki
    • Tsunehiko IkarashiMasahide KohnoShinji Miyazaki
    • C09D175/04G11B5/72G11B5/735G11B5/68
    • G11B5/735Y10S428/90Y10T428/25
    • A magnetic recording medium includes a non-magnetic supporting substrate, and a magnetic layer on one surface thereof and a back coat layer on the other surface thereof, said back coat layer having a non-magnetic powder dispersed in a binder. The back coat layer contains carbon black and an inorganic powder as said non-magnetic powder. The carbon black contains a carbon black species having an average primary particle diameter of 40 to 70 nm, and the inorganic powder has an average primary particle diameter of 40 to 150 nm and a Mohs hardness of at least 3, with a weight ratio between said carbon black and said inorganic powder being 100:0.5 to 100:10. The binder comprises a phenoxy resin, a thermoplastic polyurethane resin having an amino group in a molecule thereof, and a polyisocyanate compound.
    • 磁记录介质包括非磁性支撑基板,在其一个表面上具有磁性层,在另一个表面上具有背涂层,所述背涂层具有分散在粘合剂中的非磁性粉末。 背涂层含有炭黑和作为非磁性粉末的无机粉末。 炭黑含有平均一次粒径为40〜70nm的碳黑物质,无机粉末的平均一次粒径为40〜150nm,莫氏硬度为3以上,重量比为 炭黑,所述无机粉末为100:0.5〜100:10。 粘合剂包含苯氧基树脂,分子中具有氨基的热塑性聚氨酯树脂和多异氰酸酯化合物。
    • 38. 发明授权
    • Magneto-optical recording medium
    • 磁光记录介质
    • US6017620A
    • 2000-01-25
    • US055961
    • 1998-04-07
    • Jiro YoshinariShinji MiyazakiHiroyasu Inoue
    • Jiro YoshinariShinji MiyazakiHiroyasu Inoue
    • G11B11/105B05D3/04
    • G11B11/10586G11B11/10521G11B11/10584Y10S428/90
    • The invention is directed at a magneto-optical recording medium which is directly overwritable by light intensity modulation, does not require an initializing magnet, and has on the surface side of a substrate four magnetic layers, a memory layer M.sub.1, a writing layer W.sub.2, a switching layer S.sub.3, and an initializing layer I.sub.4. The magnetic layers each contain a rare earth element and a transition element, have perpendicular magnetic anisotropy at room temperature, and satisfy the relationships:Tc.sub.I4 >Tc.sub.W2 >Tc.sub.M1 and Tc.sub.I4 >Tc.sub.W2 >Tc.sub.S3wherein Tc.sub.M1, Tc.sub.W2, Tc.sub.S3 and Tc.sub.I4 are the Curie temperatures of M.sub.1, W.sub.2, S.sub.3 and I.sub.4, respectively. Writing layer W.sub.2 is composed mainly of dysprosium, iron and cobalt, contains from 29-35 atomic percent of rare earth elements, and has an atomic ratio Fe/(Fe+Co) of from 0.40 to 0.58. This medium has an improved CNR, minimizes deterioration in the CNR with repeated overwriting, enhances storage reliability, and has an increased output.
    • 本发明涉及一种通过光强度调制直接覆盖的磁光记录介质,不需要初始化磁体,并且在基板的表面侧上具有四个磁性层,存储层M1,书写层W2, 开关层S3和初始化层I4。 磁性层各自含有稀土元素和过渡元素,在室温下具有垂直的磁各向异性,并且满足TcI4> TcW2> TcM1和TcI4> TcW2> TcS3的关系,其中TcM1,TcW2,TcS3和TcI4为居里温度 分别为M1,W2,S3和I4。 写作层W2主要由镝,铁和钴组成,含有29-35原子%的稀土元素,原子比Fe /(Fe + Co)为0.40〜0.58。 该介质具有改进的CNR,可以最大程度地减少CNR的恶化,反复重写,提高存储可靠性,并增加输出。