| 摘要 |
PURPOSE:To obtain the titled magnetic film having a U-shaped magnetic mode and suitable for use as a high density magnetic recording material by coating an anodic magnetic film of Al having vertical magnetic anisotropy with a metal having high magnetic permeability to provide a two-layered structure. CONSTITUTION:An anodic film is formed on Al or an Al alloy by electrolysis in a sulfuric acid bath, and a magnetic metal or alloy such as a Co-Ni alloy is filled into the micropores in the anodic film and deposited thinly on the whole surface of the film by electrochemical treatment to form an anodic magnetic film having vertical magnetic anisotropy and large coercive force. The surface of the anodic magnetic film is uniformly coated with a metal having high magnetic permeability, horizontal magnetic anisotropy and small coercive force such as Ni, Co, Fe or an alloy thereof by electroplating or chemical plating. An anodic magnetic film of Al having a two-layered structure is obtd. |
