JPS5572009A - Preparation of magnetic powder - Google Patents
Preparation of magnetic powderInfo
- Publication number
- JPS5572009A JPS5572009A JP14633778A JP14633778A JPS5572009A JP S5572009 A JPS5572009 A JP S5572009A JP 14633778 A JP14633778 A JP 14633778A JP 14633778 A JP14633778 A JP 14633778A JP S5572009 A JPS5572009 A JP S5572009A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic powder
- coercive force
- magnetic
- δhcd
- inclusion
- 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
Abstract
PURPOSE: To provide a magnetic powder having coercive force of 1000 Oe or more and to enhance the output of short wavelength recording in a magnetic record midium by depositing a cobalt compound on the surface of cobalt-containing magnetic powder.
CONSTITUTION: Co-containing iron oxide particulates and a Co salt are mixed and heated in an alkaline solution to allow the surface of the iron oxide particulates to be deposited with Co compounds consisting of Co hydroxide, Co oxide, or their intermediate compounds. The formed products are dehydrated and dried to provide a magnetic powder. It is preferable to form the magnetic powder so as to satisfy a relation Hca≥ΔHcd, where ΔHca and ΔHcd are each coercive force increment caused by Co inclusion and Co deposition respectively. In this way, the coercive force of the formed magnetic powder can be added with the coercive force which has been already enhanced due to the Co inclusion, thus resulting in a magnetic powder having 1000 Oe or greater. The magnetic powder is coated on a magnetic recording medium to provide an increased output in short wavelength recording.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14633778A JPS5572009A (en) | 1978-11-27 | 1978-11-27 | Preparation of magnetic powder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14633778A JPS5572009A (en) | 1978-11-27 | 1978-11-27 | Preparation of magnetic powder |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5572009A true JPS5572009A (en) | 1980-05-30 |
JPS6136684B2 JPS6136684B2 (en) | 1986-08-20 |
Family
ID=15405401
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14633778A Granted JPS5572009A (en) | 1978-11-27 | 1978-11-27 | Preparation of magnetic powder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5572009A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57198536A (en) * | 1981-05-28 | 1982-12-06 | Sony Corp | Magnetic recording medium |
EP0629669A1 (en) * | 1993-06-14 | 1994-12-21 | Toda Kogyo Corp. | Cobalt-containing iron oxide pigments, process for producing the same and magnetic recording medium containing the same |
US6773868B2 (en) * | 2000-03-02 | 2004-08-10 | Sony Corporation | Method for producing recording medium, method for producing stamper of recording medium, apparatus for producing recording medium, and apparatus for producing stamper of recording medium |
-
1978
- 1978-11-27 JP JP14633778A patent/JPS5572009A/en active Granted
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57198536A (en) * | 1981-05-28 | 1982-12-06 | Sony Corp | Magnetic recording medium |
EP0629669A1 (en) * | 1993-06-14 | 1994-12-21 | Toda Kogyo Corp. | Cobalt-containing iron oxide pigments, process for producing the same and magnetic recording medium containing the same |
US6080233A (en) * | 1993-06-14 | 2000-06-27 | Toda Kogyo Corporation | Cobalt-containing iron oxide pigments, process for producing the same and magnetic recording medium containing the same |
US6773868B2 (en) * | 2000-03-02 | 2004-08-10 | Sony Corporation | Method for producing recording medium, method for producing stamper of recording medium, apparatus for producing recording medium, and apparatus for producing stamper of recording medium |
Also Published As
Publication number | Publication date |
---|---|
JPS6136684B2 (en) | 1986-08-20 |
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