GB1324700A - Permanently magnetizable material for magnetic recording devices - Google Patents

Permanently magnetizable material for magnetic recording devices

Info

Publication number
GB1324700A
GB1324700A GB4832170A GB4832170A GB1324700A GB 1324700 A GB1324700 A GB 1324700A GB 4832170 A GB4832170 A GB 4832170A GB 4832170 A GB4832170 A GB 4832170A GB 1324700 A GB1324700 A GB 1324700A
Authority
GB
United Kingdom
Prior art keywords
particles
loaded
magnetizable
substrate
carrier
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
GB4832170A
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.)
Stamicarbon BV
Original Assignee
Stamicarbon BV
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 Stamicarbon BV filed Critical Stamicarbon BV
Publication of GB1324700A publication Critical patent/GB1324700A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/10—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
    • H01F1/11—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
    • H01F1/111—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles with a non-magnetic core
    • 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
    • G11B5/70605—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 metals or alloys
    • G11B5/7061—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 metals or alloys with a non-magnetic core
    • 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
    • G11B5/70631—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 with a non-magnetic core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
    • H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/063—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder with a non magnetic core

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Metallurgy (AREA)
  • Paints Or Removers (AREA)
  • Hard Magnetic Materials (AREA)
  • Magnetic Record Carriers (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

1324700 Magnetic recording media STAMICARBON NV 12 Oct 1970 [10 Oct 1969] 48321/70 Heading H1H A recording medium is made by depositing on a substrate, inorganic anisotropic carrier particles loaded with permanently-magnetizable particles, and then aligning the carrier particles along their principal axes by an externallyapplied magnetic field acting on the magnetizable particles. This alignment may be effected by subjecting a suspension of the loaded carrier in a hardenable liquid to a magnetic field, between applying the suspension to the support and setting the liquid medium. The permanently-magnetizable particles may be of material that is rendered magnetizable by a thermal treatment, such treatment being applied after the loaded carrier particles have been applied to the substrate. The carrier particles may be plate-shaped, e.g. kaolinite, montmorillonite or mica, or needle-shaped, e.g. chrysotile, sepcolite, asbestos, vanadium pentoxide. In Example I, the magnetic layer is made by precipitating Co and Fe hydroxides on to V 2 O 5 particles, drying at 120‹ C., optionally reducing with H 2 at 500‹ C. and passivating, and coating on to a substrate using a hardenable liquid suspending medium. In Example II, the magnetic layer comprises kaolinate particles loaded with iron.
GB4832170A 1969-10-10 1970-10-12 Permanently magnetizable material for magnetic recording devices Expired GB1324700A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6915333A NL6915333A (en) 1969-10-10 1969-10-10

Publications (1)

Publication Number Publication Date
GB1324700A true GB1324700A (en) 1973-07-25

Family

ID=19808092

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4832170A Expired GB1324700A (en) 1969-10-10 1970-10-12 Permanently magnetizable material for magnetic recording devices

Country Status (7)

Country Link
JP (1) JPS495448B1 (en)
BE (1) BE757288A (en)
CA (1) CA927688A (en)
DE (1) DE2049808A1 (en)
FR (1) FR2065241A5 (en)
GB (1) GB1324700A (en)
NL (1) NL6915333A (en)

Also Published As

Publication number Publication date
NL6915333A (en) 1971-04-14
FR2065241A5 (en) 1971-07-23
JPS495448B1 (en) 1974-02-07
BE757288A (en) 1971-04-09
DE2049808A1 (en) 1971-04-22
CA927688A (en) 1973-06-05

Similar Documents

Publication Publication Date Title
US2711901A (en) Magnetic recording tape and method of making same
GB952201A (en) Method and apparatus for preparing magnetic recording elements
GB1291366A (en) Magnetic tape
JPS56119938A (en) Production of magnetic recording medium
Eldridge Quantitative determination of the interaction fields in aggregates of single-domain particles
FR1451260A (en) Magnetic recording process
ES423486A1 (en) Magnetic head devices enclosed by a shield having superposed layers and an intervening layer of solder
GB1416200A (en) Process and apparatus for the production of magnetic recording meida
ES538636A0 (en) PROCEDURE FOR THE PRODUCTION OF A MAGNETIC RECORDING MEDIA.
GB1439213A (en) Method of making magnetic recordings which cannot be altered without it being noticed and magnetic recording media
GB1384918A (en) Magnetic record medium and method of treating same
JPS578925A (en) Magnetic recording medium
GB1324700A (en) Permanently magnetizable material for magnetic recording devices
JPS57195328A (en) Magnetic recording medium
JPS5660001A (en) Magnetic recording medium
JPS57183630A (en) Magnetic recording medium
US3413141A (en) Method and apparatus for making oriented magnetic recording media
JPS57109134A (en) Magnetic transferring and recording method
GB1293124A (en) Method and apparatus for verifying magnetic records
JPS5247703A (en) Process for producing a recoring medium of magnetic iron oxide
US3533836A (en) Method of treating magnetic recording elements
JPS5758247A (en) Manufacture of vertical magnetic recording medium
JPS5247702A (en) Process for producing a recording medium of magnetic iron oxide
EP0094452A3 (en) Production of magnetic recording medium with vertically oriented acicular particles
JPS57138061A (en) Magnetic transferring system

Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees