GB942673A - Improvements in or relating to magnetic data storage apparatus - Google Patents

Improvements in or relating to magnetic data storage apparatus

Info

Publication number
GB942673A
GB942673A GB1949159A GB1949159A GB942673A GB 942673 A GB942673 A GB 942673A GB 1949159 A GB1949159 A GB 1949159A GB 1949159 A GB1949159 A GB 1949159A GB 942673 A GB942673 A GB 942673A
Authority
GB
United Kingdom
Prior art keywords
magnetic
resist
june
support
etching
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
GB1949159A
Inventor
Edward Michael Bradley
Peter Astwood
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.)
International Computers and Tabulators Ltd
Original Assignee
International Computers and Tabulators Ltd
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 International Computers and Tabulators Ltd filed Critical International Computers and Tabulators Ltd
Priority to GB1949159A priority Critical patent/GB942673A/en
Publication of GB942673A publication Critical patent/GB942673A/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
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/10—Etching compositions
    • C23F1/14—Aqueous compositions
    • C23F1/16—Acidic compositions
    • C23F1/28—Acidic compositions for etching iron group metals

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Magnetic Heads (AREA)
  • Thin Magnetic Films (AREA)

Abstract

942,673. Magnetic films. INTERNATIONAL COMPUTERS & TABULATORS Ltd. June 3, 1960 [June 8, 1959], No. 19491/59. Heading B6G. [Also m Division H1] A plurality of discrete magnetic film elements each having substantially uniform characteristics is produced by evaporating a magnetic material in vacuo and depositing the evaporated material on to a support under the influence of a magnetic field to produce a thin film of anisotropic magnetic material having substantially uniform characteristics over its entire area, applying a resist mask to those areas to form the discrete elements, and etching away the unprotected areas of the deposit. The support may be aluminium with nitric acid as etching fluid. In other cases, such as a nickel-iron alloy deposited on a glass support, ferric chloride may be used as etching agent. The resist may be an oil-based ink or a photographic resist. Specifications 880,383 and 942,549 are referred to.
GB1949159A 1959-06-08 1959-06-08 Improvements in or relating to magnetic data storage apparatus Expired GB942673A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1949159A GB942673A (en) 1959-06-08 1959-06-08 Improvements in or relating to magnetic data storage apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1949159A GB942673A (en) 1959-06-08 1959-06-08 Improvements in or relating to magnetic data storage apparatus

Publications (1)

Publication Number Publication Date
GB942673A true GB942673A (en) 1963-11-27

Family

ID=10130245

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1949159A Expired GB942673A (en) 1959-06-08 1959-06-08 Improvements in or relating to magnetic data storage apparatus

Country Status (1)

Country Link
GB (1) GB942673A (en)

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