JPS6450255A - Magneto-optical disk - Google Patents
Magneto-optical diskInfo
- Publication number
- JPS6450255A JPS6450255A JP62206945A JP20694587A JPS6450255A JP S6450255 A JPS6450255 A JP S6450255A JP 62206945 A JP62206945 A JP 62206945A JP 20694587 A JP20694587 A JP 20694587A JP S6450255 A JPS6450255 A JP S6450255A
- Authority
- JP
- Japan
- Prior art keywords
- film
- recording
- circumferential part
- sputtering
- outside
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE:To relieve the dependency of a laser power necessary for recording on a linear speed and to simplify a device by forming a perpendicularly magnetized film which constitutes a recording film by changing the compsn. thereof in such a manner that the Curie temp. is lower from the inside circumference toward the outside circumference. CONSTITUTION:Two-sources sputtering is executed at the time of forming the recording film by high-frequency sputtering (RF sputtering) and the disposition of targets is so contrived that a component element (for example, Co) capable of raising Tc (Curie temp.) is much sputtered in the central part. Rare earth.transition metal elements (for example, Tb Fe Co) are much sputtered in the outside circumferential part so that the film thickness uniform from the inside to the outside circumferential part is eventually obtd. The magnetic film having the higher Tc from the outside circumferential part of the magneto- optical disk toward the inside circumferential part thereof is formed by changing the compsn. of the recording film in such a manner. The dependency of the laser power necessary for recording on the linear speed is thereby relieved and the device constitution is simplified.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62206945A JPS6450255A (en) | 1987-08-20 | 1987-08-20 | Magneto-optical disk |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62206945A JPS6450255A (en) | 1987-08-20 | 1987-08-20 | Magneto-optical disk |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6450255A true JPS6450255A (en) | 1989-02-27 |
Family
ID=16531635
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62206945A Pending JPS6450255A (en) | 1987-08-20 | 1987-08-20 | Magneto-optical disk |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6450255A (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57152555A (en) * | 1981-03-18 | 1982-09-20 | Ricoh Co Ltd | Discoid magnetic recording medium |
JPS61243966A (en) * | 1985-04-22 | 1986-10-30 | Matsushita Electric Ind Co Ltd | Optical information carrier disk |
JPS61273762A (en) * | 1985-05-29 | 1986-12-04 | Fujitsu Ltd | Photomagnetic disk |
JPS62277644A (en) * | 1986-05-27 | 1987-12-02 | Toshiba Corp | Magneto-optical disk |
JPS63228445A (en) * | 1987-03-17 | 1988-09-22 | Nec Corp | Magneto-optical disk |
-
1987
- 1987-08-20 JP JP62206945A patent/JPS6450255A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57152555A (en) * | 1981-03-18 | 1982-09-20 | Ricoh Co Ltd | Discoid magnetic recording medium |
JPS61243966A (en) * | 1985-04-22 | 1986-10-30 | Matsushita Electric Ind Co Ltd | Optical information carrier disk |
JPS61273762A (en) * | 1985-05-29 | 1986-12-04 | Fujitsu Ltd | Photomagnetic disk |
JPS62277644A (en) * | 1986-05-27 | 1987-12-02 | Toshiba Corp | Magneto-optical disk |
JPS63228445A (en) * | 1987-03-17 | 1988-09-22 | Nec Corp | Magneto-optical disk |
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