公开(公告)号：US5766727A

公开(公告)日：1998-06-16

申请号：US639168

申请日：1996-04-26

申请人： Keiji Moroishi ,  Kivoshi Sato ,  Isao Kawasumi ,  Hisao Kawai

发明人： Keiji Moroishi ,  Kivoshi Sato ,  Isao Kawasumi ,  Hisao Kawai

IPC分类号： G11B5/82 ,  G11B5/64 ,  G11B5/66 ,  G11B5/72 ,  G11B5/725 ,  G11B5/73 ,  G11B5/738 ,  G11B5/84 ,  C23C14/00

CPC分类号： G11B5/7325 ,  G11B5/72 ,  G11B5/725 ,  G11B5/8408 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/265

摘要： According to the present invention, a magnetic recording medium comprises a glass substrate, a first under layer, a second under layer, a magnetic layer, a protective layer and a lubricant layer in the named order. The first under layer is formed on a glass plate, a surface of which is highly polished. The second under layer is formed, on the first under layer, of a material differing from a material of the first under layer, and has a thickness greater than a thickness of the first under layer. The magnetic layer is formed on the second under layer. The protective layer is formed on the magnetic layer, on whose surface a texture due to dispersed hard minute particles appears. The lubricant layer is formed on the protective layer. For such a magnetic recording medium, a property of the material used for the first under layer is that it promotes the crystalline growth of the second under layer, which is formed on the first under layer to support the crystalline growth of the magnetic layer that is deposited on the second under layer; and another property is that it relieves internal stress resulting from a difference in thermal expansion between the second under layer and the glass substrate.

摘要翻译： 根据本发明，磁记录介质按照所述顺序包括玻璃基板，第一下层，第二下层，磁性层，保护层和润滑剂层。 第一底层形成在玻璃板上，其表面被高度抛光。 第二下层在第一下层上形成与第一下层的材料不同的材料，并且具有大于第一下层的厚度的厚度。 磁性层形成在第二下层上。 保护层形成在磁性层上，其表面由于分散的硬微粒子出现纹理。 润滑剂层形成在保护层上。 对于这种磁记录介质，用于第一底层的材料的性质是促进形成在第一下层上的第二下层的结晶生长，以支持磁性层的结晶生长 沉积在第二下层上; 另一个特性就是减轻由于第二下层和玻璃基板之间的热膨胀差引起的内部应力。

公开(公告)号：US5746893A

公开(公告)日：1998-05-05

申请号：US575019

申请日：1995-12-19

申请人： Masato Kobayashi ,  Osamu Nozawa ,  Hisao Kawai ,  Keiji Moroishi ,  Takashi Sato ,  Junichi Horikawa

发明人： Masato Kobayashi ,  Osamu Nozawa ,  Hisao Kawai ,  Keiji Moroishi ,  Takashi Sato ,  Junichi Horikawa

IPC分类号： G11B5/66 ,  G11B5/73 ,  G11B5/851 ,  C23C14/34

CPC分类号： G11B5/7325 ,  G11B5/66 ,  G11B5/851

摘要： A method of manufacturing a magnetic recording medium by using an in-line sputtering apparatus to successively form, on a substrate, at least one underlying layer, a first magnetic CoPt-based film, a nonmagnetic intermediate film, and a second magnetic CoPt-based film. The underlying film and/or the nonmagnetic film, which are in contact with the first magnetic film, are deposited at a low sputtering power between 100 and 1000 watts to improve the magnetic properties of the magnetic recording medium. Low power sputtering is also effective to improve the distribution of difference of the crystal lattice spacings between the nonmagnetic intermediate film and the first magnetic film and between the underlying layer and the first magnetic film.