GB1436140A - Magnetic materials - Google Patents

Magnetic materials

Info

Publication number
GB1436140A
GB1436140A GB4289873A GB4289873A GB1436140A GB 1436140 A GB1436140 A GB 1436140A GB 4289873 A GB4289873 A GB 4289873A GB 4289873 A GB4289873 A GB 4289873A GB 1436140 A GB1436140 A GB 1436140A
Authority
GB
United Kingdom
Prior art keywords
sept
magnetic materials
metal ions
meq
basicity
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
GB4289873A
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of GB1436140A publication Critical patent/GB1436140A/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
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
    • G11B5/70626—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances
    • G11B5/70642—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides
    • G11B5/70678—Ferrites
    • 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
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
    • G11B5/70626—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances
    • G11B5/70642—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides
    • G11B5/70678—Ferrites
    • G11B5/70684—Ferro-ferrioxydes
    • 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
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
    • G11B5/70626—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances
    • G11B5/70642—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides
    • G11B5/70678—Ferrites
    • G11B5/70684—Ferro-ferrioxydes
    • G11B5/70689—Magnetite

Abstract

1436140 Magnetic materials EASTMAN KODAK CO 12 Sept 1973 [13 Sept 1972] 42898/73 Addition to 1395704 Heading C1A [Also in Division C3] Magnetic recording tapes include a layer containing crystalline particles of Fe 3 O 4 with a minimum acicularity ratio not below 15 and containing alkali metal ions sufficient to confer a basicity of at least 0À04 meq./gram. The crystals may also contain alkaline earth metal ions and may be doped with di- or tri-valent metals. The Fe 3 O 4 may be made by the methods of Specification 1,395,704.
GB4289873A 1972-09-13 1973-09-12 Magnetic materials Expired GB1436140A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7232367A FR2199155B1 (en) 1972-09-13 1972-09-13

Publications (1)

Publication Number Publication Date
GB1436140A true GB1436140A (en) 1976-05-19

Family

ID=9104193

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4289873A Expired GB1436140A (en) 1972-09-13 1973-09-12 Magnetic materials

Country Status (9)

Country Link
JP (1) JPS5814047B2 (en)
BE (1) BE804829A (en)
CH (1) CH581075A5 (en)
DD (1) DD105920A5 (en)
DE (1) DE2343562C3 (en)
FR (1) FR2199155B1 (en)
GB (1) GB1436140A (en)
IT (1) IT995315B (en)
NL (1) NL7312614A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2801452C2 (en) * 1978-01-13 1985-03-28 Agfa-Gevaert Ag, 5090 Leverkusen Magnetic recording material
US4778719A (en) * 1986-08-25 1988-10-18 Eastman Kodak Company Particulate magnetic recording media and method of manufacture thereof

Also Published As

Publication number Publication date
FR2199155A1 (en) 1974-04-05
BE804829A (en) 1974-03-13
NL7312614A (en) 1974-03-15
DE2343562B2 (en) 1978-02-02
DD105920A5 (en) 1974-05-12
DE2343562A1 (en) 1974-03-28
DE2343562C3 (en) 1978-09-28
JPS5814047B2 (en) 1983-03-17
CH581075A5 (en) 1976-10-29
JPS4969104A (en) 1974-07-04
IT995315B (en) 1975-11-10
FR2199155B1 (en) 1978-04-28

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee