| 摘要 |
PURPOSE:To obtain a spinel type crystalline oriented film, a specific crystalline orientation of which is oriented, by irradiating a deposited film with ions during the deposition of an oxide having a spinel composition onto a substrate and heating a thin-film. CONSTITUTION:The spinel ferrite film 32 of a recording layer 32 is formed onto an amorphous substrate 31 such as glass through the irradiation of ions during deposition. In the composition formula AxB3-xOy of the film, A represents one kind of Mn, Co, Ni, Cu, Mg, Cr, Zn, Li and Ti and B represents Fe or Al and 0.5<=x<=2.0 and 2.5<=y<=4 hold. The film is formed in an oriented film having the metastable phase having the reflection peak intensity ratio of I111/I222<0.2 of crystal faces (111), (222). CoFe3O4 exhibits particularly large Kerr effect and Faraday effect, and the <111> oriented film is easy to obtain in a Co-rich composition region particularly, and 1<x<=1.5 is suitable. There is a possibility of the insufficient rectangular-shape of the magnetization curve of the recording layer 32 as a vertically magnetized film in such a photo-magnetic recording medium. A metallic film 33 having a thermal expansion coefficient larger than spinel ferrite constituting the recording layer 32 at that time. The metallic film 33 introduces compression pressure to the recording layer oriented in a <111> orientation, and the magnetization curve of the vertically magnetized film is formed in a rectangular-shape. |
