JPS57164418A - Vertical heat magnetic recording medium - Google Patents
Vertical heat magnetic recording mediumInfo
- Publication number
- JPS57164418A JPS57164418A JP4964581A JP4964581A JPS57164418A JP S57164418 A JPS57164418 A JP S57164418A JP 4964581 A JP4964581 A JP 4964581A JP 4964581 A JP4964581 A JP 4964581A JP S57164418 A JPS57164418 A JP S57164418A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- recording medium
- heat
- vertical
- layer
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/16—Layers for recording by changing the magnetic properties, e.g. for Curie-point-writing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/1278—Structure or manufacture of heads, e.g. inductive specially adapted for magnetisations perpendicular to the surface of the record carrier
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B2005/0002—Special dispositions or recording techniques
- G11B2005/0005—Arrangements, methods or circuits
- G11B2005/0021—Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B2005/0002—Special dispositions or recording techniques
- G11B2005/0026—Pulse recording
- G11B2005/0029—Pulse recording using magnetisation components of the recording layer disposed mainly perpendicularly to the record carrier surface
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
- G11B5/09—Digital recording
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
- Magnetic Record Carriers (AREA)
Abstract
PURPOSE:To obtain a vertical head magnetic recording medium having no contact nor overlapping between magnetic patterns, by providing a magnetic layer whose magnetic permeability is high, on the substrate, and providing a magnetic recording layer having high coercive force and vertical magnetic anisotropy, on said magnetic layer. CONSTITUTION:A vertical heat (light) magnetic recording medium 13' consits of a substrate 13A, a magnetic layer 13B whose magnetic permeability is high, and a magnetic recording layer 13C having high coercive force and vertical magnetic anisotropy. A heat (light) beam from a heat (light) beam source 11 is focused on a recording medium 13, moving the recording medium 13 in the direction as indicated with an arrow. A part shown by a circle (a) irradiated by the hot beam reaches a curie point or above, is magnetized in the magnetic field direction from a coil 14, and while a heated part is moved by DELTAx and reaches a position of a circle (b), a shaded portion (c) drops quickly in temperature, and the magnetizing direction of its partis fixed so as not to follow the magnetic field. Accordingly, since it is possible to obtain a crescent-shaped and smooth pattern much smaller than a heat beam spot, there is no contact nor overlapping between magnetic patterns.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4964581A JPS57164418A (en) | 1981-04-02 | 1981-04-02 | Vertical heat magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4964581A JPS57164418A (en) | 1981-04-02 | 1981-04-02 | Vertical heat magnetic recording medium |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57164418A true JPS57164418A (en) | 1982-10-09 |
JPH0341906B2 JPH0341906B2 (en) | 1991-06-25 |
Family
ID=12836938
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4964581A Granted JPS57164418A (en) | 1981-04-02 | 1981-04-02 | Vertical heat magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57164418A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60212850A (en) * | 1984-04-09 | 1985-10-25 | Matsushita Electric Ind Co Ltd | Photomagnetic disk |
JPS61145337U (en) * | 1985-02-28 | 1986-09-08 | ||
JPS61163338U (en) * | 1985-03-26 | 1986-10-09 | ||
WO1991011807A1 (en) * | 1990-01-31 | 1991-08-08 | Sony Corporation | Optical disc system and optical disc |
JPH0453046A (en) * | 1990-06-20 | 1992-02-20 | Sharp Corp | Magneto-optical recording medium |
US5392263A (en) * | 1990-01-31 | 1995-02-21 | Sony Corporation | Magneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lens |
US5618638A (en) * | 1990-01-29 | 1997-04-08 | Brother Kogyo Kabushiki Kaisha | Optical magnetic recording medium |
US5910932A (en) * | 1991-09-11 | 1999-06-08 | Sony Corporation | Optical disk and optical disk system with numerical aperture of objective lens related to protective layer thickness of optical disk |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5589928A (en) * | 1978-12-27 | 1980-07-08 | Fujitsu Ltd | Vertical magnetic recorder and its reproduction system |
-
1981
- 1981-04-02 JP JP4964581A patent/JPS57164418A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5589928A (en) * | 1978-12-27 | 1980-07-08 | Fujitsu Ltd | Vertical magnetic recorder and its reproduction system |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60212850A (en) * | 1984-04-09 | 1985-10-25 | Matsushita Electric Ind Co Ltd | Photomagnetic disk |
JPS61145337U (en) * | 1985-02-28 | 1986-09-08 | ||
JPS61163338U (en) * | 1985-03-26 | 1986-10-09 | ||
US5618638A (en) * | 1990-01-29 | 1997-04-08 | Brother Kogyo Kabushiki Kaisha | Optical magnetic recording medium |
WO1991011807A1 (en) * | 1990-01-31 | 1991-08-08 | Sony Corporation | Optical disc system and optical disc |
US5392263A (en) * | 1990-01-31 | 1995-02-21 | Sony Corporation | Magneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lens |
USRE37428E1 (en) | 1990-01-31 | 2001-10-30 | Sony Corporation | Magneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lens |
JPH0453046A (en) * | 1990-06-20 | 1992-02-20 | Sharp Corp | Magneto-optical recording medium |
US5910932A (en) * | 1991-09-11 | 1999-06-08 | Sony Corporation | Optical disk and optical disk system with numerical aperture of objective lens related to protective layer thickness of optical disk |
Also Published As
Publication number | Publication date |
---|---|
JPH0341906B2 (en) | 1991-06-25 |
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