GB977691A - Magnetic storage elements and methods of making them - Google Patents

Magnetic storage elements and methods of making them

Info

Publication number
GB977691A
GB977691A GB4145059A GB4145059A GB977691A GB 977691 A GB977691 A GB 977691A GB 4145059 A GB4145059 A GB 4145059A GB 4145059 A GB4145059 A GB 4145059A GB 977691 A GB977691 A GB 977691A
Authority
GB
United Kingdom
Prior art keywords
nickel
layer
cobalt
sulphate
substrate
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
GB4145059A
Inventor
Robert John Heritage
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.)
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
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 National Research Development Corp UK filed Critical National Research Development Corp UK
Priority to GB4145059A priority Critical patent/GB977691A/en
Publication of GB977691A publication Critical patent/GB977691A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/48—Coating with alloys
    • C23C18/50—Coating with alloys with alloys based on iron, cobalt or nickel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F10/00—Thin magnetic films, e.g. of one-domain structure
    • H01F10/08—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers
    • H01F10/10—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Chemically Coating (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

A high speed magnetic storage element in the form of a thin film is made by chemically depositing from alkaline solution a layer of nickel-cobalt-phosphorus alloy on to a substrate in the presence of a magnetic field, the weight ratio of nickel to cobalt in the layer being between 60 : 40 and 40 : 60 and the proportion of phosphorus lying in the range of 5-13% by weight. Deposition is effected from a hypophosphite-containing solution on to a substrate (flat or cylindrical) of nickel, iron, cobalt, palladium or gold or on to a body having a layer of one of these metals, e.g. a layer of evaporated copper on a resin sheet coated with palladium, palladium-coated glass, copper electroplated with nickel-phosphorus, or nickel or iron evaporated on to glass or resin. A specified solution contains nickel sulphate, cobalt sulphate, ammonium sulphate, sodium citrate, hypophosphorous acid, ammonium hydroxide and, optionally, chlorine or chromium ions derived from sodium chloride, chromium sulphate or chromium chloride. The layer preferably has a thickness of 500-3000 <\>rA.u. Discrete elements may be made by masking the substrate during deposition. The layers may be used in a store in which printed circuit boards in contact therewith provide the switching and access conductors. According to the Provisional Specification, anisotropic layers may be produced by polishing the substrate in one direction and dispensing with the applied field.
GB4145059A 1959-12-07 1959-12-07 Magnetic storage elements and methods of making them Expired GB977691A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4145059A GB977691A (en) 1959-12-07 1959-12-07 Magnetic storage elements and methods of making them

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4145059A GB977691A (en) 1959-12-07 1959-12-07 Magnetic storage elements and methods of making them

Publications (1)

Publication Number Publication Date
GB977691A true GB977691A (en) 1964-12-09

Family

ID=10419743

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4145059A Expired GB977691A (en) 1959-12-07 1959-12-07 Magnetic storage elements and methods of making them

Country Status (1)

Country Link
GB (1) GB977691A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101968982A (en) * 2010-09-20 2011-02-09 南京大学 Ni-Co-P/cenosphere magnetic composite material and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101968982A (en) * 2010-09-20 2011-02-09 南京大学 Ni-Co-P/cenosphere magnetic composite material and preparation method thereof

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