DE2344644C2 - Verfahren zur Herstellung von magnetischen Aufzeichnungen, die nicht unbemerkt verändert werden können - Google Patents
Verfahren zur Herstellung von magnetischen Aufzeichnungen, die nicht unbemerkt verändert werden könnenInfo
- Publication number
- DE2344644C2 DE2344644C2 DE2344644A DE2344644A DE2344644C2 DE 2344644 C2 DE2344644 C2 DE 2344644C2 DE 2344644 A DE2344644 A DE 2344644A DE 2344644 A DE2344644 A DE 2344644A DE 2344644 C2 DE2344644 C2 DE 2344644C2
- Authority
- DE
- Germany
- Prior art keywords
- temperature
- antiferromagnetic
- magnetic
- recording
- magnetic field
- 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
Links
- 230000005291 magnetic effect Effects 0.000 title claims description 53
- 238000000034 method Methods 0.000 title description 15
- 239000000463 material Substances 0.000 claims description 32
- 230000005290 antiferromagnetic effect Effects 0.000 claims description 22
- 230000005294 ferromagnetic effect Effects 0.000 claims description 13
- 230000005415 magnetization Effects 0.000 claims description 9
- 230000002427 irreversible effect Effects 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 description 11
- 239000000969 carrier Substances 0.000 description 10
- 239000000203 mixture Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000000696 magnetic material Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 239000002902 ferrimagnetic material Substances 0.000 description 4
- 239000003302 ferromagnetic material Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000002885 antiferromagnetic material Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000005293 ferrimagnetic effect Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 101100005631 Mus musculus Ccni gene Proteins 0.000 description 1
- 101100479616 Mus musculus Iars1 gene Proteins 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- ZGDWHDKHJKZZIQ-UHFFFAOYSA-N cobalt nickel Chemical compound [Co].[Ni].[Ni].[Ni] ZGDWHDKHJKZZIQ-UHFFFAOYSA-N 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 239000006103 coloring component Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 159000000014 iron salts Chemical class 0.000 description 1
- FRVCGRDGKAINSV-UHFFFAOYSA-L iron(2+);octadecanoate Chemical compound [Fe+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O FRVCGRDGKAINSV-UHFFFAOYSA-L 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000005298 paramagnetic effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 150000008442 polyphenolic compounds Chemical class 0.000 description 1
- 235000013824 polyphenols Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/28—Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs
- G11B23/281—Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs by changing the physical properties of the record carrier
-
- 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
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/64—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT898672A AT343373B (de) | 1972-10-20 | 1972-10-20 | Magnetogrammtrager zur nicht unbemerkt veranderbaren aufzeichnung magnetischer signale und verfahren zur herstellung solcher aufzeichnungen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE2344644A1 DE2344644A1 (de) | 1974-05-02 |
| DE2344644C2 true DE2344644C2 (de) | 1982-04-15 |
Family
ID=3610215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2344644A Expired DE2344644C2 (de) | 1972-10-20 | 1973-09-05 | Verfahren zur Herstellung von magnetischen Aufzeichnungen, die nicht unbemerkt verändert werden können |
Country Status (9)
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1524187A (en) * | 1974-10-16 | 1978-09-06 | Emi Ltd | Magnetic recording |
| US4239959A (en) * | 1977-03-23 | 1980-12-16 | General Kinetics Incorporated | Perpetuation of information in magnetically recorded medium |
| DE2950174A1 (de) * | 1979-12-13 | 1981-06-19 | Basf Ag, 6700 Ludwigshafen | Verfahren und vorrichtung zur echtheitspruefung von aufzeichnungstraegern, die gegen faelschung zu sichern sind |
| DE2950129A1 (de) | 1979-12-13 | 1981-06-19 | BASF Corp., New York, N.Y. | Verfahren und vorrichtung zur echtheitspruefung von aufzeichnungstraegern, die gegen faelschung zu sichern sind |
| US4404603A (en) * | 1980-05-27 | 1983-09-13 | Warren Eugene D | Apparatus and method for inspecting magnetic tape recorded material for alterations |
| EP0215023B1 (en) * | 1985-03-18 | 1990-12-05 | McWHIRTER HOLDINGS PTY LIMITED | Magnetic tape cassette having a prerecorded low frequency tone |
| US4980782A (en) * | 1985-06-03 | 1990-12-25 | Peter Ginkel | Software protection and identification system |
| US4858036A (en) * | 1986-08-04 | 1989-08-15 | Peter Ginkel | Software protection and identification system |
| US4639584A (en) * | 1985-07-25 | 1987-01-27 | Adams Robert T | Non-alterable magnetic coding |
| US4706282A (en) * | 1985-12-23 | 1987-11-10 | Minnesota Mining And Manufacturing Company | Decoder for a recorder-decoder system |
| JPH04105458U (ja) * | 1991-01-16 | 1992-09-10 | 日本電池株式会社 | 電池用液口栓部 |
| US5533759A (en) * | 1994-09-13 | 1996-07-09 | Eastman Kodak Company | Method of currency or document validation by use of a temperature sensitive magnetic pattern |
| JP2001076331A (ja) * | 1999-09-02 | 2001-03-23 | Toshiba Corp | 磁気記録媒体及び磁気記録再生装置 |
| DE10008097A1 (de) * | 2000-02-22 | 2001-09-20 | Forschungszentrum Juelich Gmbh | Markierungseinrichtung sowie Verfahren zum Auslesen einer solchen Markierungseinrichtung |
| EP1662486A1 (en) * | 2004-11-29 | 2006-05-31 | EMPA Eidgenössische Materialprüfungs- und Forschungsanstalt | Process for storing information in a magnetic multi-layer device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3134094A (en) * | 1963-07-02 | 1964-05-19 | Litton Systems Inc | Spin resonant transducer |
| US3648257A (en) * | 1966-08-24 | 1972-03-07 | Minnesota Mining & Mfg | Sheetlike material, the method of storing an image consisting of differing magnetic, electrical, and optical properties |
| US3521294A (en) * | 1967-03-13 | 1970-07-21 | Ampex | Magneto thermal recording process and apparatus |
| FR1524309A (fr) * | 1967-03-29 | 1968-05-10 | Centre Nat Rech Scient | Mémoires d'informations binaires à structures magnétiques en couches minces |
-
1972
- 1972-10-20 AT AT898672A patent/AT343373B/de not_active IP Right Cessation
-
1973
- 1973-09-05 DE DE2344644A patent/DE2344644C2/de not_active Expired
- 1973-10-15 JP JP11487873A patent/JPS576163B2/ja not_active Expired
- 1973-10-16 US US406972A patent/US3883892A/en not_active Expired - Lifetime
- 1973-10-17 CA CA183,558A patent/CA1003954A/en not_active Expired
- 1973-10-18 FR FR7337260A patent/FR2204006B1/fr not_active Expired
- 1973-10-18 GB GB4857073A patent/GB1439213A/en not_active Expired
- 1973-10-19 IT IT53243/73A patent/IT994466B/it active
- 1973-10-22 BE BE136919A patent/BE806345A/xx not_active IP Right Cessation
Non-Patent Citations (1)
| Title |
|---|
| NICHTS-ERMITTELT |
Also Published As
| Publication number | Publication date |
|---|---|
| ATA898672A (de) | 1977-09-15 |
| GB1439213A (en) | 1976-06-16 |
| JPS576163B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1982-02-03 |
| IT994466B (it) | 1975-10-20 |
| BE806345A (fr) | 1974-04-22 |
| FR2204006B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1977-03-11 |
| AT343373B (de) | 1978-05-26 |
| JPS4975116A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1974-07-19 |
| FR2204006A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1974-05-17 |
| CA1003954A (en) | 1977-01-18 |
| DE2344644A1 (de) | 1974-05-02 |
| US3883892A (en) | 1975-05-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OD | Request for examination | ||
| 8126 | Change of the secondary classification |
Ipc: G11B 5/62 |
|
| D2 | Grant after examination |