EP0048414A1
Expired / Lapsed
EP
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Magnetic recording medium
Assignee: Toshiba Corp
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Filing: 1981-09-11
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Granted: —
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Expires: 2001-09-11
Abstract
Abstract A magnetic recording medium for perpendicular magnetic recording comprises a low coercive force material (2), and a magnetic recording layer (3) which is formed on the low coercive force layer (2) and has magnetic anisotropy perpendicular to the surface of said low coercive force layer (2). The magnetic recording layer (3) is chosen to have 0.3 µm or less in thickness.
Inventors
- 👤 Kazuyoshi Yamamori
- 👤 Reiji Nishikawa
- 👤 Tatsuo Fujiwara
- 👤 Toshimitsu Asano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 11:22
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B5/8416; G11B5/62; G11B5/64; G11B5/66; G11B5/672; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/12; Y10T428/12465; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12569; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/12854; Y10T428/12861; Y10T428/12931
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
54 words
A magnetic recording medium which comprises: a low coercive force material; and a magnetic recording layer which is formed on the low coercive force layer and whose magnetic anisotropy is perpendicular to the surface of said recording layer, and wherein the magnetic recording layer is chosen to have a smaller thickness than 0.3 µm.
Claim 2
Dependent Claim
54 words
A magnetic recording medium which comprises: a low coercive force material; and a magnetic recording layer which is formed on the low coercive force layer and whose magnetic anisotropy is perpendicular to the surface of said recording layer, and wherein the magnetic recording layer is chosen to have a smaller thickness than 0.3 µm.
Claim 3
Dependent Claim
19 words
The magnetic recording medium according to claim 1, wherein the magnetic recording layer is formed of a Co-Cr alloy.
Claim 4
Dependent Claim
29 words
The magnetic recording medium according to claim 1 or 2, wherein the magnetic recording layer is 0 chosen to have a thickness ranging between 200 A and 0.3 µm.
Claim 5
Dependent Claim
28 words
The magnetic recording medium according to claim 1 or 2, wherein the low coercive force layer is chosen to have a thickness ranging between 0.5 and 2.0 µm.
Claim 6
Dependent Claim
22 words
The magnetic recording medium according to claim 1 ro 2, wherein the low coercive force layer is formed of a Fe-Ni alloy.
Claim 7
Dependent Claim
23 words
The magnetic recording medium according to claim 1 or 2, wherein the low coercive force layer is previously formed on a nonmagnetic base.
Claim 8
Dependent Claim
18 words
The magnetic recording medium according to claim 6, wherein the nonmagnetic base is formed of a synthetic resin.
References Cited (Backward Citations)
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