GB1493160A - Magnetic disc for recording with high storage density - Google Patents

Magnetic disc for recording with high storage density

Info

Publication number
GB1493160A
GB1493160A GB43941/75A GB4394175A GB1493160A GB 1493160 A GB1493160 A GB 1493160A GB 43941/75 A GB43941/75 A GB 43941/75A GB 4394175 A GB4394175 A GB 4394175A GB 1493160 A GB1493160 A GB 1493160A
Authority
GB
United Kingdom
Prior art keywords
film
magnetic
high storage
anodic oxide
storage density
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.)
Expired
Application number
GB43941/75A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Publication of GB1493160A publication Critical patent/GB1493160A/en
Expired legal-status Critical Current

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
    • G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
    • G11B5/82—Disk carriers
    • 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
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/739—Magnetic recording media substrates
    • G11B5/73911—Inorganic substrates
    • G11B5/73913—Composites or coated substrates
    • 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
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/739—Magnetic recording media substrates
    • G11B5/73911—Inorganic substrates
    • G11B5/73917—Metallic substrates, i.e. elemental metal or metal alloy substrates
    • G11B5/73919—Aluminium or titanium elemental or alloy substrates

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Magnetic Record Carriers (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

1493160 Magnetic coating on anodized aluminium NIPPON TELEGRAPH & TELEPHONE PUBLIC CORP 24 Oct 1975 [24 Oct 1974] 43941/75 Heading C7B and C7F A magnetic disk for high storage density recording comprises an Al or Al alloy (e.g. Fe-Al) substrate coated with an anodic oxide film 1 to 10 microns thick and a magnetic film formed directly on the anodic oxide film. Anodizing may be effected in 10% sulphuric acid at 10 volts and an anodic current density of 7A/dm<SP>2</SP>. The anodic oxide coating may be polished e.g. with cerium oxide grinding grain to 0À02 micron surface roughness, prior to forming the magnetic film e.g. by sputtering an Fe-Al target in an Ar/O 2 atmosphere at 2 x 10<SP>-2</SP> Torr in presence of the coated substrate to form a film of α-Fe 2 O 3 and Al thereon and reducing in H 2 at 360‹C to form a magnetic film of Fe 3 O 4 and Al.
GB43941/75A 1974-10-24 1975-10-24 Magnetic disc for recording with high storage density Expired GB1493160A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12194874A JPS5337203B2 (en) 1974-10-24 1974-10-24

Publications (1)

Publication Number Publication Date
GB1493160A true GB1493160A (en) 1977-11-23

Family

ID=14823871

Family Applications (1)

Application Number Title Priority Date Filing Date
GB43941/75A Expired GB1493160A (en) 1974-10-24 1975-10-24 Magnetic disc for recording with high storage density

Country Status (5)

Country Link
JP (1) JPS5337203B2 (en)
DE (1) DE2547408A1 (en)
FR (1) FR2289022A1 (en)
GB (1) GB1493160A (en)
NL (1) NL182180C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0131895A1 (en) * 1983-07-19 1985-01-23 Hitachi Metals, Ltd. Magnetic disk substrate
US4540449A (en) * 1983-03-31 1985-09-10 Nippon Light Metal Company Limited Aluminum substrate for magnetic recording media
GB2191511A (en) * 1986-06-10 1987-12-16 Komatsu Mfg Co Ltd Fabricating an electro-photographic photosensor

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5168207A (en) * 1974-12-10 1976-06-12 Fujitsu Ltd JIKIDEISUKUYOKIBANNO SEIZOHOHO
JPS5760957Y2 (en) * 1978-09-14 1982-12-25
DE3014718A1 (en) * 1980-04-17 1981-10-22 Ibm Deutschland Gmbh, 7000 Stuttgart MULTILAYER MAGNETIC THIN FILM PLATE WITH SYNTHETIC RESIN LAYER AND METHOD FOR THE PRODUCTION THEREOF
US4552820A (en) * 1984-04-25 1985-11-12 Lin Data Corporation Disc media

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4540449A (en) * 1983-03-31 1985-09-10 Nippon Light Metal Company Limited Aluminum substrate for magnetic recording media
EP0131895A1 (en) * 1983-07-19 1985-01-23 Hitachi Metals, Ltd. Magnetic disk substrate
GB2191511A (en) * 1986-06-10 1987-12-16 Komatsu Mfg Co Ltd Fabricating an electro-photographic photosensor

Also Published As

Publication number Publication date
JPS5148303A (en) 1976-04-26
JPS5337203B2 (en) 1978-10-07
DE2547408A1 (en) 1976-04-29
NL182180C (en) 1988-01-18
NL7512229A (en) 1976-04-27
FR2289022B1 (en) 1980-01-04
FR2289022A1 (en) 1976-05-21

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19951023