EP0291726B1 - Alliage amorphe pour éléments détecteurs en forme de rubans - Google Patents

Alliage amorphe pour éléments détecteurs en forme de rubans Download PDF

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Publication number
EP0291726B1
EP0291726B1 EP88106558A EP88106558A EP0291726B1 EP 0291726 B1 EP0291726 B1 EP 0291726B1 EP 88106558 A EP88106558 A EP 88106558A EP 88106558 A EP88106558 A EP 88106558A EP 0291726 B1 EP0291726 B1 EP 0291726B1
Authority
EP
European Patent Office
Prior art keywords
strip
amorphous alloy
alloy
shaped sensor
sensor elements
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 - Lifetime
Application number
EP88106558A
Other languages
German (de)
English (en)
Other versions
EP0291726A2 (fr
EP0291726A3 (en
Inventor
Hans-Rainer Dr. Hilzinger
Giselher Dr. Herzer
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.)
Vacuumschmelze GmbH and Co KG
Original Assignee
Vacuumschmelze GmbH and Co KG
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 Vacuumschmelze GmbH and Co KG filed Critical Vacuumschmelze GmbH and Co KG
Publication of EP0291726A2 publication Critical patent/EP0291726A2/fr
Publication of EP0291726A3 publication Critical patent/EP0291726A3/de
Application granted granted Critical
Publication of EP0291726B1 publication Critical patent/EP0291726B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2408—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using ferromagnetic tags
    • G08B13/2411—Tag deactivation
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C45/00—Amorphous alloys
    • C22C45/04—Amorphous alloys with nickel or cobalt as the major constituent
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2428—Tag details
    • G08B13/2437—Tag layered structure, processes for making layered tags
    • G08B13/2442—Tag materials and material properties thereof, e.g. magnetic material details
    • 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
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15316—Amorphous metallic alloys, e.g. glassy metals based on Co

Definitions

  • the invention relates to an amorphous alloy according to the preamble of claim 1 and a strip-shaped sensor element.
  • Narrow and thin strips of a well soft magnetic material are required for security labels. So far commercial strips made of both crystalline and amorphous material have been used. The usual dimensions here are strip widths less than 3 mm, strip thicknesses less than 40 ⁇ m and label lengths from 50 to 100 mm, in individual cases even less. It is important for the functioning of such strips that the material can be completely magnetized or re-magnetized with the smallest possible exciting magnetic fields. Due to the non-linearity of the magnetization curve of the strip when magnetic saturation is reached, when the magnetization is reversed in a corresponding receiver coil of an anti-theft system, z. B. harmonics of the excitation frequency are generated, which are used to detect the strip and thus a possible thief.
  • the field strength H s which is necessary for the complete magnetization of the strip, is essentially determined by the geometry of the strip (magnetic shear effect) and the magnetic anisotropy energy transverse to the strip direction.
  • H s is the geometry of the strip (magnetic shear effect) and the magnetic anisotropy energy transverse to the strip direction.
  • w is the width
  • t is the thickness
  • 1 is the length of the strip
  • B s is the saturation induction
  • H A is the magnetic anisotropy field.
  • the factor ⁇ also depends, albeit only very weakly, on the strip geometry and can essentially be regarded as constant.
  • the magnetic excitation field strength in current systems must be about the order of magnitude or greater than the saturation field strength H s , if possible.
  • H s saturation field strength
  • z. B. to avoid false alarms by other ferromagnetic objects or for reasons of power requirements for the excitation field strength, to reduce unnecessary losses or heating, the excitation field strength should not be too large.
  • the demagnetizing field in the strip direction is significantly reduced according to the equation. This has the desired effect that the magnetic stripe can be remagnetized in relatively small excitation fields and thus delivers the desired signal.
  • the saturation field strength H s can be further reduced by making the anisotropy field H A almost disappear by special heat treatments.
  • This is e.g. B. the case for magnetic material with an intrinsically rectangular magnetization loop, which is why such a material turned out to be particularly suitable in many cases.
  • the invention has for its object to find an amorphous alloy with which, if necessary, the length of the strip-shaped sensor elements can be reduced in the sense of miniaturization, it must be ensured that the desired function can also be performed.
  • This object is achieved by an amorphous alloy with the features of claim 1 and by the sensor element according to claim 5.
  • the present invention is based on the knowledge that for such special applications the saturation field strength H s can be achieved not only by reducing the cross section but also by reducing the saturation magnetization.
  • the known, commercially available alloys in the field of application according to the invention all have a saturation magnetization B s of greater than 0.5 T.
  • B s saturation magnetization
  • EP-OS 0 121 694 shows that the saturation magnetization is far greater than 0.5 T, and it is noted that it is particularly advantageous if the saturation magnetization has a value equal to or greater than 1 T .
  • u 4 to 10 at.%
  • X 35 to 45 at.%
  • Y 0 to 1
  • z 21 to 23 at.%.
  • the attached table shows the results of a series of alloys which have been subjected to heat treatment in the longitudinal field. For economic reasons, such a heat treatment should not take too long, ie be shorter than about 1 day, and still be a remanence ratio B r / B s > 0.6 achieve.
  • alloys 1 to 6 have a saturation induction in the desired range, but do not respond sufficiently to heat treatment at all temperatures used here (ie, no desired remanence ratio could be achieved B r / B s > 0.6 can be achieved).
  • a number of alloys such as B. known, which respond well to heat treatment ( B r / B s > 0.6 accessible), but all of them B s > 0.5 T have and are out of the question for these desired applications.
  • Alloys 7 to 11 are suitable, however l B s ⁇ 0.5 T. and B r / B s > 0.6 to reach.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Security & Cryptography (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Power Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Soft Magnetic Materials (AREA)
  • Burglar Alarm Systems (AREA)

Claims (5)

  1. Alliage amorphe pour éléments détecteurs en forme de bandes, à faible induction de saturation, pour utilisation dans des étiquettes antivol ou des détecteurs de champ magnétiuqe, caractérisé en ce qu'il s'agit d'un alliage exempt de magnétostriction ayant une induction de saturation B s ≦ 0,5 T
    Figure imgb0032
     et une bonne capacité de réponse à un traitement de revenu dans un champ magnétique, pour l'obtention d'un rapport de rémanence Br/Bs > 0,6, et en ce que l'alliage présente la formule brute



            Co100 - u - x - y - z Feu Nix Ty (SiB)z



    u allant de 4 à 10 % en atomes
    x allant de 20 à 50 % en atomes
    y allant de o à 18 % en atomes
    z allant de 5 à 30 % en atomes
    et la condition
    S = x + 5,3 y + 4,1 Z - 0,73 u ≃ 120 à 135
    Figure imgb0033
     étant remplie, x + Y étant > 20 % en atomes et Nb + B étant > 6 % en atomes, l'élément T étant Nb et celui-ci étant éventuellement remplaçable, à raison de jusqu'à 3 % en atomes (par rapport à l'alliage total) par Mo, Cr, V, Zr, Ti, W.
  2. Alliage amorphe selon la revendication 1, dans lequel u = 4 à 10 % en atomes, x = 20 à 45 % en atomes, Y = 0 à 4 % en atomes, Z = 20 à 30 % en atomes, et la condition S = x + 5,3 Y + 4,1 z - 0,73 u≃120 à 130
    Figure imgb0034
    Figure imgb0035
     est remplie.
  3. Alliage amorphe selon la revendication 1, dans lequel u = 4 à 10 % en atomes, x = 20 à 30 % en atomes, y = 12 à 18 % en atomes, z = 5 à 12 % en atomes, et la condition S = x + 5,3 y + 4,1 z - 0,73 u≃ 120 à 130
    Figure imgb0036
    Figure imgb0037
     est remplie.
  4. Alliage amorphe selon la revendication 1, dans lequel u = 4 à 10 % en atomes, x = 35 à 45 % en atomes, y = 0 à 1, z = 21 à 23 % en atomes.
  5. Elément détecteur en forme de bande, à base d'un alliage selon l'une quelconque des revendications précédents, pour utilisation dans des étiquettes antivol ou des détecteurs de champ magnétique.
EP88106558A 1987-05-21 1988-04-23 Alliage amorphe pour éléments détecteurs en forme de rubans Expired - Lifetime EP0291726B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873717043 DE3717043A1 (de) 1987-05-21 1987-05-21 Amorphe legierung fuer streifenfoermige sensorelemente
DE3717043 1987-05-21

Publications (3)

Publication Number Publication Date
EP0291726A2 EP0291726A2 (fr) 1988-11-23
EP0291726A3 EP0291726A3 (en) 1989-07-05
EP0291726B1 true EP0291726B1 (fr) 1993-06-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP88106558A Expired - Lifetime EP0291726B1 (fr) 1987-05-21 1988-04-23 Alliage amorphe pour éléments détecteurs en forme de rubans

Country Status (4)

Country Link
US (1) US5037494A (fr)
EP (1) EP0291726B1 (fr)
JP (1) JP3065085B2 (fr)
DE (2) DE3717043A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6313746B1 (en) 1999-04-23 2001-11-06 Vacuumschelmze Gmbh Magnet marker strip and a method of producing a magnetic marker strip

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5015992A (en) * 1989-06-29 1991-05-14 Pitney Bowes Inc. Cobalt-niobium amorphous ferromagnetic alloys
US5015993A (en) * 1989-06-29 1991-05-14 Pitney Bowes Inc. Ferromagnetic alloys with high nickel content and high permeability
US5532598A (en) * 1994-05-25 1996-07-02 Westinghouse Electric Corporation Amorphous metal tagging system for underground structures including elongated particles of amorphous metal embedded in nonmagnetic and nonconductive material
US5800635A (en) * 1995-06-15 1998-09-01 Alliedsignal Inc. Method of achieving a controlled step change in the magnetization loop of amorphous alloys
US5976274A (en) * 1997-01-23 1999-11-02 Akihisa Inoue Soft magnetic amorphous alloy and high hardness amorphous alloy and high hardness tool using the same
US6432226B2 (en) * 1999-04-12 2002-08-13 Alliedsignal Inc. Magnetic glassy alloys for high frequency applications
US6475303B1 (en) 1999-04-12 2002-11-05 Honeywell International Inc. Magnetic glassy alloys for electronic article surveillance
MX2008015202A (es) * 2006-06-02 2008-12-09 Plymouth Francaise Sa Sistema de deteccion adecuado para identificar y rastrear tubos enterrados u otros cuerpos enterrados en el suelo o incrustados en trabajos de ingenieria civil.
US7771545B2 (en) * 2007-04-12 2010-08-10 General Electric Company Amorphous metal alloy having high tensile strength and electrical resistivity
US9275529B1 (en) * 2014-06-09 2016-03-01 Tyco Fire And Security Gmbh Enhanced signal amplitude in acoustic-magnetomechanical EAS marker
US10989834B2 (en) 2017-10-27 2021-04-27 Energy & Environmental Research Center Identifying subterranean structures using amorphous metal markers

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59582B2 (ja) * 1976-03-23 1984-01-07 東北大学金属材料研究所長 磁歪が小さく耐摩耗性の大きい磁気ヘツド用非晶質合金およびその製造方法
JPS6037179B2 (ja) * 1977-02-24 1985-08-24 ティーディーケイ株式会社 非晶質磁性合金
US4188211A (en) * 1977-02-18 1980-02-12 Tdk Electronics Company, Limited Thermally stable amorphous magnetic alloy
US4225339A (en) * 1977-12-28 1980-09-30 Tokyo Shibaura Denki Kabushiki Kaisha Amorphous alloy of high magnetic permeability
US4439236A (en) * 1979-03-23 1984-03-27 Allied Corporation Complex boride particle containing alloys
US4298862A (en) * 1979-04-23 1981-11-03 Allied Chemical Corporation Amorphous antipilferage marker
USRE32428E (en) * 1979-04-23 1987-05-26 Allied Corporation Amorphous antipilferage marker
US4484184A (en) * 1979-04-23 1984-11-20 Allied Corporation Amorphous antipilferage marker
DE2924280A1 (de) * 1979-06-15 1981-01-08 Vacuumschmelze Gmbh Amorphe weichmagnetische legierung
JPS5931580B2 (ja) * 1979-08-28 1984-08-02 東北金属工業株式会社 低保磁力・高角形性を有するアモルファス合金薄板の製造方法
JPS5754251A (en) * 1980-09-15 1982-03-31 Tdk Corp Amorphous magnetic alloy material
JPS57205872A (en) * 1981-03-19 1982-12-17 Toshiba Corp Cassette tape
JPS5831053A (ja) * 1981-08-18 1983-02-23 Toshiba Corp 非晶質合金
DE3265257D1 (en) * 1981-11-02 1985-09-12 Allied Corp Amorphous antipilferage marker
EP0160166A1 (fr) * 1981-11-26 1985-11-06 Allied Corporation Alliages de métal amorphes à magnétostriction basse
US4553136A (en) * 1983-02-04 1985-11-12 Allied Corporation Amorphous antipilferage marker
JPS6070157A (ja) * 1983-09-28 1985-04-20 Toshiba Corp 非晶質合金及びその製造方法
JPS6164861A (ja) * 1984-09-06 1986-04-03 Tohoku Metal Ind Ltd 磁気損失が小さく高角形性を有するアモルフアス合金の製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6313746B1 (en) 1999-04-23 2001-11-06 Vacuumschelmze Gmbh Magnet marker strip and a method of producing a magnetic marker strip

Also Published As

Publication number Publication date
DE3881962D1 (de) 1993-07-29
EP0291726A2 (fr) 1988-11-23
JP3065085B2 (ja) 2000-07-12
EP0291726A3 (en) 1989-07-05
US5037494A (en) 1991-08-06
JPS63307238A (ja) 1988-12-14
DE3717043A1 (de) 1988-12-15

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