GB1273405A - Improvements relating to a method of detecting and/or recording electromagnetic radiation - Google Patents

Improvements relating to a method of detecting and/or recording electromagnetic radiation

Info

Publication number
GB1273405A
GB1273405A GB5464869A GB5464869A GB1273405A GB 1273405 A GB1273405 A GB 1273405A GB 5464869 A GB5464869 A GB 5464869A GB 5464869 A GB5464869 A GB 5464869A GB 1273405 A GB1273405 A GB 1273405A
Authority
GB
United Kingdom
Prior art keywords
iii
type
detecting
electromagnetic radiation
dope
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
GB5464869A
Inventor
Cecil Arthur Clark
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Priority to GB5464869A priority Critical patent/GB1273405A/en
Publication of GB1273405A publication Critical patent/GB1273405A/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
    • H01F1/40—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials of magnetic semiconductor materials, e.g. CdCr2S4
    • H01F1/401—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials of magnetic semiconductor materials, e.g. CdCr2S4 diluted
    • H01F1/407—Diluted non-magnetic ions in a magnetic cation-sublattice, e.g. perovskites, La1-x(Ba,Sr)xMnO3
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/16—Measuring radiation intensity
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/16—Layers for recording by changing the magnetic properties, e.g. for Curie-point-writing
    • 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
    • H01F1/40—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials of magnetic semiconductor materials, e.g. CdCr2S4
    • H01F1/401—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials of magnetic semiconductor materials, e.g. CdCr2S4 diluted

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Molecular Biology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

1,273,405. Magnetic materials. PHILIPS GLOEILAMPENFABRIEKEN N.V. 7 Nov., 1969, No. 54648/69. Heading H1H. [Also in Division C1] A semi-conductive material for detecting and/or recording electromagnetic radiation has a magnetic permeability greater than 12, below the Curie point, and has the crystalline spinel structure MCr 2 S 4 where m is one or more of Cd, Zn, Hg, Mn, Fe<SP>II</SP>, Co, Mg, Ni, Pb, Cu<SP>I</SP>+Ga<SP>III</SP>/2, Cu<SP>I</SP>+In<SP>III</SP>/2, Cu<SP>I</SP>+Fe<SP>III</SP>/2, Ag<SP>I</SP>+In<SP>III</SP>/2 and Ag<SP>I</SP>+Fe<SP>III</SP>/2. The material may contain up to 10 mol. per cent of an N- or P-type semiconductor dope, e.g. In, Ga, Cu or Ag. Compounds of formula MCr 2 S 4 may be made semiconductive without use of a dope by heating to introduce S-vacancies (resulting in N-type) or by heating in a S-rich atmosphere to introduce metal vacancies (resulting in P-type). In an example, a single crystal of P-type CaCr 2 S 4 is exposed to light at 4À2‹ and 77‹ K. to produce permanent and temporary changes in magnetic permeability and coercive force.
GB5464869A 1969-11-07 1969-11-07 Improvements relating to a method of detecting and/or recording electromagnetic radiation Expired GB1273405A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5464869A GB1273405A (en) 1969-11-07 1969-11-07 Improvements relating to a method of detecting and/or recording electromagnetic radiation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5464869A GB1273405A (en) 1969-11-07 1969-11-07 Improvements relating to a method of detecting and/or recording electromagnetic radiation

Publications (1)

Publication Number Publication Date
GB1273405A true GB1273405A (en) 1972-05-10

Family

ID=10471676

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5464869A Expired GB1273405A (en) 1969-11-07 1969-11-07 Improvements relating to a method of detecting and/or recording electromagnetic radiation

Country Status (1)

Country Link
GB (1) GB1273405A (en)

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Legal Events

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