发明授权
- 专利标题: Method for producing a perpendicular magnetic recording medium
- 专利标题(中): 用于制造垂直磁记录介质的方法
-
申请号: US329822申请日: 1981-12-11
-
公开(公告)号: US4407894A公开(公告)日: 1983-10-04
- 发明人: Sadao Kadokura , Takashi Tomie , Masahiko Naoe
- 申请人: Sadao Kadokura , Takashi Tomie , Masahiko Naoe
- 申请人地址: JPX Osaka
- 专利权人: Teijin Limited
- 当前专利权人: Teijin Limited
- 当前专利权人地址: JPX Osaka
- 优先权: JPX55/174680 19801212
- 主分类号: H01F41/18
- IPC分类号: H01F41/18 ; C23C14/34 ; G11B5/64 ; G11B5/85 ; G11B5/851 ; G11B5/852 ; H01F10/02 ; C23C15/00
摘要:
Magnetic recording medium conventionally utilizes the in-plane magnetization mode, but, recently, the perpendicular magnetization mode utilizing the perpendicular anistropy of an hcp cobalt alloy layer, in which C axis is oriented normal to the layer surface, is proposed. The known perpendicular magnetic recording medium has been produced by an RF sputtering, but such medium is of too low flexibility to use it in the form of a magnetic tape. In addition, the production rate of the perpendicular magnetic recording medium by RF sputtering is very low.The perpendicular magnetic recording medium is very flexible due to particle pattern (FIGS. 10, 12 and 13) completely distinct from the conventional columnar pattern (FIGS. 8 and 11). In addition, the production rate is high, because the base (20) is located beside a space between the targets (T.sub.1, T.sub.2) of a sputtering device and further the magnetic field is generated perpendicularly to the sputtering surfaces (T.sub.1s, T.sub.2s) by a field coil (31) or magnets (32, 33). The present invention makes it possible to commercially produce the perpendicular magnetic recording medium, especially in the tape form.
公开/授权文献
- US6142208A Seal pickup station 公开/授权日:2000-11-07