G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 5/85 (2006.01) G11B 5/64 (2006.01) G11B 5/84 (2006.01)
Patent
CA 2217253
The quantity of impurities in a magnetic material is decreased to produce a magnetic material with good quality, and a decrease in the cost of the magnetic material is realized by desulfurization. A magnetic raw material for metallic thin film magnetic recording media which contains sulfur more than 20 ppm is desulfurized to obtain the magnetic material for metallic thin film magnetic recording media with the sulfur content adjusted to 20 ppm or below, and a metallic thin film magnetic recording medium having a magnetic layer vaporized thereon with the magnetic material is fabricated.
Cette invention concerne une méthode de désulfuration visant à réduire la quantité d'impuretés dans un matériau magnétique et à produire un matériau de qualité supérieure à coût réduit. Un matériau magnétique brut destiné à constituer un support d'enregistrement magnétique en couche mince et renfermant plus 20 mg/kg de soufre est soumis à un traitement de désulfuration pour donner un support d'enregistrement magnétique à teneur en soufre d'au plus 20 mg/kg, suivi du dépôt en phase vapeur sur ledit matériau en couche mince d'un revêtement magnétique.
Chiba Kazunobu
Katagiri Hideo
Osumi Hiroshi
Takeda Tsutomu
Yamada Hiroyuki
Gowling Lafleur Henderson Llp
Sony Corporation
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