JPS57164421A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS57164421A JPS57164421A JP4985481A JP4985481A JPS57164421A JP S57164421 A JPS57164421 A JP S57164421A JP 4985481 A JP4985481 A JP 4985481A JP 4985481 A JP4985481 A JP 4985481A JP S57164421 A JPS57164421 A JP S57164421A
- Authority
- JP
- Japan
- Prior art keywords
- substrate
- magnetic recording
- magnetic
- constitution
- whose
- 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
- 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
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/851—Coating a support with a magnetic layer by sputtering
Landscapes
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Thin Magnetic Films (AREA)
Abstract
PURPOSE:To obtain a magnetic recording medium for high density recording, whose S/N ratio is high, by measuring the size of a demagnetizing pole section of a metallic thin film magnetic layer whose main components are Co and O, at right angles to the magnetic recording direction on a substrate, and setting it within a specific value range. CONSTITUTION:A substrate 5 consisting of a polyester film, etc. is made to run in the direction as indicated with an arrow along the circumferential surface of a cooling can 2 from a winding-off machine 3, and is wounded 4. A maerial 7 stored in a crucible 8 placed under the cooling can 2, and consisting essentially of Co is vapor-deposited on the substrate 5 by use of a mask 6 so as to become lower continuously within the range extending from a 90 deg. incident angle of to the 40 deg. minimum incident angle (theta), and O2 gas, etc. are led in from a gas leading-in nozzle 9. In this way, a magnetic layer is formed so that the size of a demagnetizing pole section M is within the range of 0.03-0.3mu by measuring it at a right angle in the magnetic recording direction, for instance, by 20% O2 concentration, 60 deg.C temperature of the substrate 5, 20% Ni concentration, and 1,000Angstrom /sec vapor-deposition speed. According to such constitution, a magnetic tape whose S/N ratio is high is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4985481A JPS57164421A (en) | 1981-04-01 | 1981-04-01 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4985481A JPS57164421A (en) | 1981-04-01 | 1981-04-01 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57164421A true JPS57164421A (en) | 1982-10-09 |
| JPH0125144B2 JPH0125144B2 (en) | 1989-05-16 |
Family
ID=12842636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4985481A Granted JPS57164421A (en) | 1981-04-01 | 1981-04-01 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57164421A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6150218A (en) * | 1984-08-16 | 1986-03-12 | Fuji Photo Film Co Ltd | Production of magnetic recording medium |
-
1981
- 1981-04-01 JP JP4985481A patent/JPS57164421A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6150218A (en) * | 1984-08-16 | 1986-03-12 | Fuji Photo Film Co Ltd | Production of magnetic recording medium |
| JPH0434205B2 (en) * | 1984-08-16 | 1992-06-05 | Fuji Photo Film Co Ltd |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0125144B2 (en) | 1989-05-16 |
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