FR2231075A1 - Inscription and erasure of data on magnetic tape - using both magneto inductive and laser methods at reduced concentration - Google Patents

Inscription and erasure of data on magnetic tape - using both magneto inductive and laser methods at reduced concentration

Info

Publication number
FR2231075A1
FR2231075A1 FR7417807A FR7417807A FR2231075A1 FR 2231075 A1 FR2231075 A1 FR 2231075A1 FR 7417807 A FR7417807 A FR 7417807A FR 7417807 A FR7417807 A FR 7417807A FR 2231075 A1 FR2231075 A1 FR 2231075A1
Authority
FR
France
Prior art keywords
tape
erasure
data
inscription
magnetic tape
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.)
Granted
Application number
FR7417807A
Other languages
French (fr)
Other versions
FR2231075B3 (en
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of FR2231075A1 publication Critical patent/FR2231075A1/en
Application granted granted Critical
Publication of FR2231075B3 publication Critical patent/FR2231075B3/fr
Granted legal-status Critical Current

Links

Classifications

    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
    • G11C13/04—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam
    • G11C13/06—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam using magneto-optical elements

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

The tape is coated with a magneto-optic layer of semiconducting magnetic material of formula CuCrSe3X where X is Cl, Br or I or a non-stoichiometric modification thereof. To write in the data the material is irradiated with laser light in local spots to produce a slight increase of local temp. which remains below the Curie point, while applying a magnetic field to the interior of the tape, which is below the coercive field of the non-illuminated part of the layer but above that of the illuminated part, the tape being thus magnetised and demagnetised locally. The materials used have high specific Faraday rotation (F) and low absorption (x) so that the ratio 2F/x is very high. Erasure is by heating and raising the inductive field simultaneously over the whole tape and subsequent cooling in a magnetic field.
FR7417807A 1973-05-23 1974-05-22 Inscription and erasure of data on magnetic tape - using both magneto inductive and laser methods at reduced concentration Granted FR2231075A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2326315A DE2326315A1 (en) 1973-05-23 1973-05-23 METHOD FOR STORING MAGNETICALLY ENCODED DATA IN A MAGNETO-OPTIC SEMICONDUCTOR LAYER

Publications (2)

Publication Number Publication Date
FR2231075A1 true FR2231075A1 (en) 1974-12-20
FR2231075B3 FR2231075B3 (en) 1977-03-18

Family

ID=5881923

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7417807A Granted FR2231075A1 (en) 1973-05-23 1974-05-22 Inscription and erasure of data on magnetic tape - using both magneto inductive and laser methods at reduced concentration

Country Status (6)

Country Link
US (1) USB472276I5 (en)
BE (1) BE815433A (en)
DE (1) DE2326315A1 (en)
FR (1) FR2231075A1 (en)
IT (1) IT1012631B (en)
NL (1) NL7406588A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2572575B1 (en) * 1984-10-30 1989-10-13 Thomson Csf INFORMATION TRANSCRIPTION METHOD AND SYSTEM IMPLEMENTING THIS METHOD

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3625583A (en) * 1968-07-15 1971-12-07 Ibm Erasable hologram
US3680065A (en) * 1970-05-25 1972-07-25 Ibm Nonvolatile magneto-optical memory element and a method of writing thereon

Also Published As

Publication number Publication date
NL7406588A (en) 1974-11-26
FR2231075B3 (en) 1977-03-18
USB472276I5 (en) 1976-03-09
BE815433A (en) 1974-09-16
IT1012631B (en) 1977-03-10
DE2326315A1 (en) 1974-12-12

Similar Documents

Publication Publication Date Title
JPS5231703A (en) Magnetic thin film recording medium
JPS5674843A (en) Photomagnetic recording medium
ATE91190T1 (en) METHODS OF RECORDING DATA ONTO RECORDING MATERIAL AND SUCH RECORDING MATERIAL.
FR2231075A1 (en) Inscription and erasure of data on magnetic tape - using both magneto inductive and laser methods at reduced concentration
JPS5512545A (en) Magnetic recording media
JPS5724046A (en) Photoelectric recording medium and its recorer and reproducer
JPS5794948A (en) Photomagnetic recording medium
JPS56163517A (en) Vertical magnetization recording head
JPS6472346A (en) Magneto-optical recording method
KR920001459A (en) Magneto-optical recording and reproducing method and magneto-optical recording and reproducing apparatus
JPS5250219A (en) Magnetic recorded pattern reading device
JPS57120254A (en) Magnetooptical recording carrier
JPS51130210A (en) Magnetic pen
JPS6435714A (en) Magnetic head
JPS57113415A (en) Vertical magnetic recording medium
JPS558640A (en) Magnetic recording and reproducing system
JPS57183647A (en) Magentrooptical storage element
JPS5319809A (en) Production of magnetic recording medium
JPS57179907A (en) Vertical magnetic recorder
JPS5240312A (en) Magnetic recording method
JPS5370637A (en) Addressable memory for electron ray beam
JPS57205827A (en) Manufacture of magnetic recording medium
JPS55124692A (en) Method of printing
JPS5241893A (en) Magnetic recording medium
JPS5220810A (en) Magnetic recording and playback apparatus containing double gap head

Legal Events

Date Code Title Description
ST Notification of lapse