DE2235574A1 - METHOD OF REVERSIBLE OPTICAL STORAGE - Google Patents

METHOD OF REVERSIBLE OPTICAL STORAGE

Info

Publication number
DE2235574A1
DE2235574A1 DE19722235574 DE2235574A DE2235574A1 DE 2235574 A1 DE2235574 A1 DE 2235574A1 DE 19722235574 DE19722235574 DE 19722235574 DE 2235574 A DE2235574 A DE 2235574A DE 2235574 A1 DE2235574 A1 DE 2235574A1
Authority
DE
Germany
Prior art keywords
magneto
information
optical
layer
curie temperature
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.)
Pending
Application number
DE19722235574
Other languages
German (de)
Inventor
Klaus Dr Patzer
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.)
Jenoptik AG
Original Assignee
Jenoptik Jena GmbH
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 Jenoptik Jena GmbH filed Critical Jenoptik Jena GmbH
Publication of DE2235574A1 publication Critical patent/DE2235574A1/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
    • G11B11/10504—Recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • G11B11/10584—Record carriers characterised by the selection of the material or by the structure or form characterised by the form, e.g. comprising mechanical protection elements

Description

Verfahren zur reversiblen optischen Speicherung Die Erfindung betrifft ein Verfahren zur reversiblen optischen Speicherung von Informationen in magnetooptischen Medien bei Temperaturen in der Nähe des Drehpunktes und eine magnetooptische Schicht zur Anwendung des Verfahrens. Method for Reversible Optical Storage The invention relates to a method for reversible optical storage of information in magneto-optical Media at temperatures near the pivot point and a magneto-optical layer to apply the procedure.

Es ist bekannt, Informationen in hartmagnetische Schichten, die einheitlich in Richtung der Schichtnormalen magnetisiert und auf eine Temperatur, die etwasunterhaib der Curie-Temperatur liegt, vorgewärmt sind, dadurch einzuspeichern, daß die Schichten mit Licht, dessen Intensität gemäß-der einzuspeichernden Information moduliert ist, bestrahlt werden. Durch die eingestrahlte Energie wird die Curie-Temperatur in mehr oder weniger großen Bereichen der Schicht überschritten, so daß dort unter dem Einfluß des äußeren Feldes ein unmagnetisierter Bereich entsteht. It is known to have information in hard magnetic layers that are uniform magnetized in the direction of the layer normal and at a temperature which the Curie temperature is, are preheated, to be stored by the fact that the layers with light, the intensity of which is modulated according to the information to be stored, be irradiated. The Curie temperature increases due to the radiated energy or less large areas of the layer exceeded so that there under the influence of the external field creates a non-magnetized area.

Bei dieser Art des Einspeicherns von Informationen besteht, insbesondere bei häufigen und rasch aufeinanderfolgenden Speicher vorgängen, die Gefahr, daß die Erwärmung auf der Schichtoberfläche sich in Gebiete fortsetzt, die von dem Löschvorgang nicht berührt werden sollen. Die Folge davon ist der Verlust von eingespeicherten Informationen. In this type of storage of information, there is, in particular with frequent and rapidly successive memory processes, the risk that the heating on the layer surface continues in areas exposed by the erasure process should not be touched. The consequence of this is the loss of stored Information.

Der Erfindung liegt die Aufgabe zugrunde, die geschilderten Mängel des standes der Technik zu beheben unter Beibehaltung der durch das Vorwärmen erhöhten Empfindlichkeit der magnetooptischen Schicht. The invention is based on the problem of the deficiencies outlined the state of the art to remedy while maintaining the increased by preheating Sensitivity of the magneto-optical layer.

Diese Aufgabe wird durch ein Verfahren zur reversiblen optischen Speicherung von Informationen in magnetooptischen Medien bei Temperaturen in der Nähe des Curie-Funktes qrfindungsgemäß dadurch gelöst, daß eine magnetooptische Schiçht zur Ausbildung einer magnetischen Vorzugsrichtung innerhalb dieser Schicht durch Einstrahlung fokussiert er, räumlich unmodulierter elektromagnetischer Strahlung lokal bis über die Curie-Temperatur unter Anlegen eines magnetischen Gl#ichfeldes erwärmt und dann bis dicht unter die Curie-Temperatur abgekühlt und danach durch eine räumlich modulierte, die Information enthaltende, elektromagnetische Strahlung wiederum teilweise bis über die Curie-Temperatur erwärmt wird. This task is accomplished by a reversible optical method Storage of information in magneto-optical media at temperatures in the Proximity of the Curie point is solved according to the invention in that a magneto-optical Schiçht for the formation of a preferred magnetic direction within this layer by radiation it focuses spatially unmodulated electromagnetic radiation locally up to above the Curie temperature with the application of a magnetic smoothing field warmed and then cooled to just below the Curie temperature and then cooked through a spatially modulated electromagnetic radiation containing the information again partially heated to above the Curie temperature.

Vorteilhafterweise wird für dieses Verfahren eine magnetooptische Schicht verwendet, die sich auf einem Träger befindet, der an eine Kühleinrichtung angeschlossen und in Flächenbereiche eingeteilt ist, die gegeneinander thermisch isoliert sind. A magneto-optical method is advantageously used for this method Layer used, which is located on a carrier, which is attached to a cooling device is connected and divided into areas that are thermally opposite to one another are isolated.

An Hand eines in der Zeichnung dargestellten AusfUhr#gsbeispieles der erfindungsgemäßen magnetooptischen Schicht soll das Wesen der Erfindung näher erläutert werden. On the basis of an exemplary embodiment shown in the drawing the magneto-optical layer according to the invention is intended to explain the essence of the invention in more detail explained.

Auf einem Träger 1 ist eine magnetooptische Schicht 2 aufgebracht, auf der kleine Oberflächengebiete 3 durch Rillen 4 voneinander getrennt sind. Diese Rillen dienen zur thermischen Isolierung der Gebiete 3. Diese Oberflächengebiete müssen nicht notwendigerweise quadratisch oder rechteckig sein, sie können eine beliebige, von der Herstellungstechnologie abhängige Form der erdung aufweisen. A magneto-optical layer 2 is applied to a carrier 1, on which small surface areas 3 are separated from one another by grooves 4. These Grooves serve to thermally isolate areas 3. These surface areas don't necessarily have to be square or rectangular, they can be have any form of grounding, depending on the manufacturing technology.

Claims (2)

Patent ansprüche Patent claims Verfahren zur reversiblen optischen Speicherung von Informationen in magnetooptischen Medien bei Temperaturen in der Nähe des Curie-Punktes, dadurch gekennzeichnet, daß eine magnetooptische Schicht zur Ausbildung einer magnetischen Vorzugsrichtung innerhalb dieser Schicht durch Einstrahlung fokussiert er, räumlich unmodulierter elektromagnetischer Strahlung lokal bis über die Curie-Temperatur erwärmt, unter Anlegen eines magnetischen Gleichfeldes bis dicht unter die Curie-Temperatur abgekühlt und danach durch eine räumlich modulierte, die Information enthaltende, elektromagnetische Strahlung wiederum teilweise bis über die Curie-Temperatur erwärmt wird. Process for the reversible optical storage of information in magneto-optical media at temperatures near the Curie point, thereby characterized in that a magneto-optical layer for forming a magnetic It focuses on the preferred direction within this layer through irradiation, spatially unmodulated electromagnetic radiation locally up to above the Curie temperature heated, with the application of a constant magnetic field to just below the Curie temperature cooled and then by a spatially modulated, the information containing, electromagnetic radiation, in turn, is partially heated up to above the Curie temperature will. 2. Magnetooptische Schicht zur reversiblen optischen Speicherung von Informationen, dadurch gekennzeichnet, daß sie sich auf einem Träger befindet, der an eine Kühleinrichtung angeschlossen und in Flächenbereiche eingeteilt ist, die gegenein ander thermisch isoliert sind. 2. Magneto-optical layer for reversible optical storage of information, characterized in that it is on a carrier, which is connected to a cooling device and divided into surface areas, which are thermally insulated from one another.
DE19722235574 1971-12-31 1972-07-20 METHOD OF REVERSIBLE OPTICAL STORAGE Pending DE2235574A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD16014571A DD97505A1 (en) 1971-12-31 1971-12-31

Publications (1)

Publication Number Publication Date
DE2235574A1 true DE2235574A1 (en) 1973-07-12

Family

ID=5484951

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19722235574 Pending DE2235574A1 (en) 1971-12-31 1972-07-20 METHOD OF REVERSIBLE OPTICAL STORAGE

Country Status (2)

Country Link
DD (1) DD97505A1 (en)
DE (1) DE2235574A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2497994A1 (en) * 1981-01-14 1982-07-16 Sharp Kk MAGNETO-OPTICAL MEMORY HOLDER
EP0110730A2 (en) * 1982-12-06 1984-06-13 Plasmon Data Systems N.V. Improvements relating to data storage and recording
EP0110729A2 (en) * 1982-12-06 1984-06-13 Plasmon Data Systems N.V. Image forming and data storage
WO1984004420A1 (en) * 1983-04-28 1984-11-08 Comtech Res Unit Data storage and recording
US4616237A (en) * 1982-09-27 1986-10-07 Pa Management Consultants, Ltd. Data storage medium

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2497994A1 (en) * 1981-01-14 1982-07-16 Sharp Kk MAGNETO-OPTICAL MEMORY HOLDER
US4616237A (en) * 1982-09-27 1986-10-07 Pa Management Consultants, Ltd. Data storage medium
US4928132A (en) * 1982-09-27 1990-05-22 Plasmon Data Systems Optical data storage medium
US4758307A (en) * 1982-09-27 1988-07-19 Plasmon Data Systems N.V. Method of manufacturing a data storage medium
US4724444A (en) * 1982-09-27 1988-02-09 Plasmon Data Systems, Incorporated Data storage medium
WO1984002420A1 (en) * 1982-12-06 1984-06-21 Comtech Res Unit Image forming and data storage
EP0110730A3 (en) * 1982-12-06 1984-07-11 Comtech Research Unit Limited Improvements relating to data storage and recording
EP0110729A3 (en) * 1982-12-06 1984-07-11 Comtech Research Unit Limited Image forming and data storage
WO1984002419A1 (en) * 1982-12-06 1984-06-21 Comtech Res Unit Improvements relating to data storage and recording
EP0110729A2 (en) * 1982-12-06 1984-06-13 Plasmon Data Systems N.V. Image forming and data storage
EP0110730A2 (en) * 1982-12-06 1984-06-13 Plasmon Data Systems N.V. Improvements relating to data storage and recording
WO1984004420A1 (en) * 1983-04-28 1984-11-08 Comtech Res Unit Data storage and recording
EP0126565A1 (en) * 1983-04-28 1984-11-28 Plasmon Data Systems N.V. Improvements relating to data storage and recording

Also Published As

Publication number Publication date
DD97505A1 (en) 1973-05-14

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