Coating processes – Magnetic base or coating – Magnetic coating
Patent
1996-04-10
1997-02-04
Pianalto, Bernard
Coating processes
Magnetic base or coating
Magnetic coating
2041921, 427128, 427129, 427131, 427132, 427250, 427255, 4272552, 427264, 427270, 427271, 427294, 427331, 427404, B05D 512
Patent
active
055995802
ABSTRACT:
A magnetic recording medium is constructed with a substrate made of glass, one or two underlayers, and a magnetic film. In order that the easy magnetization axis of the magnetic film is parallel to the magnetic film, an underlayer having an NaCl crystallographic structure is superposed on the substrate. A magnetic film made of a Co based alloy having a hexagonal close packed crystallographic structure is formed on this underlayer, putting an underlayer made of a material having a body centered cubic crystallographic structure therebetween at need. Magnetic anisotropy of the magnetic film is increased by forming grooves in a predetermined direction in a surface portion of the substrate. These grooves play a role also for defining the orientation of the underlayer made of the material having an NaCl crystallographic structure.
Futamoto Masaaki
Hirayama Yoshiyuki
Honda Yukio
Inaba Nobuyuki
Matsuda Yoshibumi
Hitachi , Ltd.
Pianalto Bernard
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