Abstract:
A magneto-optical recording medium including a recording film (10) having a reproduction layer (13), an intermediate layer (14), and a recording layer (15) on an optical disc substrate. The recording film (10) is a magnetic film magnetically connected and having magnetic anisotropy in the direction vertical to the film surface. A recording magnetic domain formed on the recording layer (15) is transferred onto the reproduction layer (13). Recording information is reproduced by movement of the magnetic domain wall. The recording layer (15) has a columnar structure orientated substantially in the vertical direction. Thus, it becomes possible to perform a high-speed reproduction of a signal below the diffraction limit of the light spot for recording/reproducing the information and significantly improve the recording density and the transfer speed. Even when recorded at a high density, it is possible to form a stable recording magnetic domain.
Abstract:
A method of forming a film on an optical disk comprising (a) the step of carrying an optical disk substrate into a vacuum chamber, (b) the step of disposing the optical disk substrate to face a target provided in the vacuum chamber and including a film−forming material, and (c) the step of forming a specified film on a fixed or rotating−on−axis or revolving optical disk substrate by a sputtering method using the target, wherein a relation a > 2D is satisfied where a is a target radius and D the radius of the optical disk substrate, thereby forming a higher−density−compatible, homogeneous film on an optical disk.