Double-sided magneto-optical media for a multi-disk storage device

A double sided optically sensitive media for a storing information in a high storage density information storage system comprising:

• a substrate having two side surfaces, each of said side surfaces having a microscopic relief formed on an annular portions thereof;
• a thin-film reflective layer on each of said side surfaces of said substrate to reflect a lightbeam;
• a transparent thin-film dielectric layer on each of said reflective layers to isolate said reflective layers;
• an optically sensitive thin-film recording layers on each of said dielectric layers, the composition of said recording layers including a rare-earth transition-metal to magnetically store information;
• and
• a transparent thin-film protective layer on each of said recording layers, the composition of said protective layers having stiction sufficiently weak and asperity sufficiently low to allow a read/write heads to fly over the double sided media at a predetermined low height during operation of the information storage system.

A high density magneto-optical storage system for storing information comprising:

• a plurality of disks axially mounted on a rotatable spindle, each of said disks having two side surfaces;
• a plurality of air-bearing low-flying read/write heads to read and write information on said plurality of disks;
• each of said disks including a substrate having a microscopic relief formed on each of said side surfaces to provide a pre-formatted structure for storing information;
• a thin-film reflective layer on each of said side surfaces to reflect a lightbeam used for reading and writing information;
• a transparent thin-film dielectric layer on each of said reflective layers to isolate said reflective layers;
• an optically sensitive thin-film recording layer on each of said dielectric layers, the composition of said recording layer including a rare-earth transition-metal to magnetically store information;
• and
• a transparent thin-film protective layer on each of said recording layer, the composition of said protective layers having weak stiction and low asperity being effective to allow said read/write heads to fly over said side surfaces of said disks during operation of the information storage system.

A method for making a magneto-optical disk for use with an air-incident lightbeam and an air-bearing low-flying read/write head of a rotary disk device for storing information comprising the steps of:

• forming a substrate;
• forming a microscopic relief formed on a side surface of said substrate to provide a pre-formatted structure for storing information;
• applying a thin-film reflective layer on said side surface to reflect a lightbeam used for reading and writing information;
• applying a transparent thin-film dielectric layer on said reflective layer to isolate said reflective layer;
• applying an optically sensitive thin-film recording layer on said dielectric layer, the composition of said recording layer including a rare-earth transition-metal to magnetically store information;
• and
• applying a transparent thin-film protective layer applied on said recording layer, the composition of said protective layer having weak stiction and low asperity to allow a read/write head to fly over said side surface at a predetermined height during operation of the disk in a rotary disk device.

A thin-film, double sided, magneto-optical media for storing information by means of an air incident lightbeam comprising:

• a substrate having two side surfaces, each of said side surfaces having a microscopic relief to provide a pre-formatted structure for storing information;
• a thin-film reflective layer on each of said side surfaces to reflect an incident lightbeam used for reading and writing information;
• an optional transparent thin-film dielectric layer on each of said reflective layers to isolate said reflective layers;
• an optically sensitive thin-film recording layer applied on each of said dielectric layers, the composition of said recording layers including a rare-earth transition-metal to magnetically store information;
• and
• a transparent thin-film protective layer on each of said recording layers to minimize corrosion of said recording layers.