WO1996007767A1 - Method of manufacture of amorphous transducer elements - Google Patents

Method of manufacture of amorphous transducer elements Download PDF

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Publication number
WO1996007767A1
WO1996007767A1 PCT/SE1995/000984 SE9500984W WO9607767A1 WO 1996007767 A1 WO1996007767 A1 WO 1996007767A1 SE 9500984 W SE9500984 W SE 9500984W WO 9607767 A1 WO9607767 A1 WO 9607767A1
Authority
WO
WIPO (PCT)
Prior art keywords
strip
fixture
ribbon
annealing process
amorphous
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.)
Ceased
Application number
PCT/SE1995/000984
Other languages
French (fr)
Inventor
Marilyn Wun-Fogle
Thu-Van T. Luu
Arthur E. Clark
Carl Tyrén
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.)
RSO Corp NV
Original Assignee
RSO Corp 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 RSO Corp NV filed Critical RSO Corp NV
Priority to JP8509421A priority Critical patent/JPH10505710A/en
Priority to DE69505847T priority patent/DE69505847T2/en
Priority to EP95930779A priority patent/EP0804628B1/en
Publication of WO1996007767A1 publication Critical patent/WO1996007767A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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
    • G08B13/244—Tag manufacturing, e.g. continuous manufacturing processes
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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
    • H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
    • H01F1/0304—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions adapted for large Barkhausen jumps or domain wall rotations, e.g. WIEGAND or MATTEUCCI effect
    • 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
    • H01F1/15341—Preparation processes therefor
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N35/00—Magnetostrictive devices
    • H10N35/80—Constructional details
    • H10N35/85—Magnetostrictive active materials

Definitions

  • the present invention relates to a method for manu ⁇ facturing amorphous transducer elements with a high magnetomechanical coupling and with various non-planar cross-sectional shapes.
  • a well known fact is that amorphous magnetic strips, such as ribbons, wires, etc., can be made into transducer elements with a high magnetomechanical coupling by heat- treating or annealing the strip or the ribbon in a trans ⁇ verse magnetic field.
  • IEEE Transactions on Magnetics, Vol. MAG-17, NO. 6 November 1981: "Magneto ⁇ mechanical Coupling and Permeability in Transversely An ⁇ nealed Metglas 2605 Alloys" .
  • the accepted procedure is to place the un-annealed strip in a vacuum or argon-filled furnace and anneal the strip at a temperature of 380°C to 430°C. In this temperature range an atomic motion occurs, but the material maintains its non-crystalline structure.
  • a magnetic field is applied, which is sufficiently strong to develop magnetic domains, and the axes of which are perpendicular to the strip.
  • a difficulty arises when it is desired to give the magnetic strip a particular cross-sectional shape and at the same time achieve a high magnetomechanical coupling.
  • the ideal design is a thin ribbon with an arched cross- sectional shape.
  • the fixture inevitably generates undesired forces in portions of the strip, generally along the edges.
  • the stresses caused by the fixture unfortunately prevents the develop- ment of domain configurations with a high coupling factor during the annealing process. The result is a substantially reduced coupling factor.
  • a method is pro ⁇ vided that renders it possible to manufacture amorphous magnetic strips or ribbons with any desired non-planar cross-sectional shape, while achieving a high magneto ⁇ mechanical coupling.
  • the strip annealing process is divided into two steps, fixture tension being released between the two steps.
  • An application of the method according to the inven ⁇ tion comprises the following steps : a) The strip or ribbon is arranged in a two-part fix- ture adapted to give the strip the desired cross-sectional shape, the fixture then being closed and the strip, firmly fixed inside the fixture, being exposed to an annealing process at a temperature of around 360°C, without influence from any magnetic field during the annealing process. b) After the annealing process has been completed ac ⁇ cording to step a) , the fixture and the strip are cooled.
  • the resulting product is a transducer element with a high magnetic coupling and with the desired shape.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Dispersion Chemistry (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Magnetic Heads (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Light Receiving Elements (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Heat Treatment Of Articles (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Hall/Mr Elements (AREA)

Abstract

The present invention relates to a method for manufacturing amorphous transducer elements with a high magnetomechanical coupling and with various non-planar cross-sectional shapes. According to the invention the amorphous strip or ribbon is arranged in a shaping fixture and is annealed in a two-step process with an intermediate cooling step, the annealing process during the first step being carried out with the strip or ribbon firmly fixed in the fixture but with no influence from any magnetic field, and the annealing process during the second step being carried out at a higher temperature with the strip or ribbon no longer being fixed in the fixture and under the influence of a transverse magnetic field.

Description

Method of manufacture of amorphous transducer elements
The present invention relates to a method for manu¬ facturing amorphous transducer elements with a high magnetomechanical coupling and with various non-planar cross-sectional shapes. A well known fact is that amorphous magnetic strips, such as ribbons, wires, etc., can be made into transducer elements with a high magnetomechanical coupling by heat- treating or annealing the strip or the ribbon in a trans¬ verse magnetic field. For instance, see IEEE Transactions on Magnetics, Vol. MAG-17, NO. 6 , November 1981: "Magneto¬ mechanical Coupling and Permeability in Transversely An¬ nealed Metglas 2605 Alloys" . The accepted procedure is to place the un-annealed strip in a vacuum or argon-filled furnace and anneal the strip at a temperature of 380°C to 430°C. In this temperature range an atomic motion occurs, but the material maintains its non-crystalline structure. During the annealing process a magnetic field is applied, which is sufficiently strong to develop magnetic domains, and the axes of which are perpendicular to the strip. A difficulty arises when it is desired to give the magnetic strip a particular cross-sectional shape and at the same time achieve a high magnetomechanical coupling. The ideal design is a thin ribbon with an arched cross- sectional shape. If the ribbon for this purpose is placed in a two- part fixture forming the strip to the desired shape, the fixture inevitably generates undesired forces in portions of the strip, generally along the edges. The stresses caused by the fixture unfortunately prevents the develop- ment of domain configurations with a high coupling factor during the annealing process. The result is a substantially reduced coupling factor.
Until now, the difficulties described above have lim¬ ited amorphous magnetoelastical strips or ribbons to planar thin strips or ribbons, which due to their flexibility and lack of stiffness have caused difficulties when the strips are being used in certain applications.
According to the present invention a method is pro¬ vided that renders it possible to manufacture amorphous magnetic strips or ribbons with any desired non-planar cross-sectional shape, while achieving a high magneto¬ mechanical coupling.
In the method according to the invention the strip annealing process is divided into two steps, fixture tension being released between the two steps.
An application of the method according to the inven¬ tion, which has proved successful, comprises the following steps : a) The strip or ribbon is arranged in a two-part fix- ture adapted to give the strip the desired cross-sectional shape, the fixture then being closed and the strip, firmly fixed inside the fixture, being exposed to an annealing process at a temperature of around 360°C, without influence from any magnetic field during the annealing process. b) After the annealing process has been completed ac¬ cording to step a) , the fixture and the strip are cooled. c) After the cooling the upper part of the fixture is removed, and the strip, now resting on the lower part of the fixture, is exposed to a second annealing process in the temperature range between 380°C and 430°C, a transverse magnetic field sufficiently strong to develop a domain structure with a high coupling factor being applied in a manner known per se during the annealing process.
The resulting product is a transducer element with a high magnetic coupling and with the desired shape.

Claims

1. Method for manufacturing amorphous transducer elements with a high magnetomechanical coupling and with various cross-sectional shapes, c h a r a c t e r i z e d in that the amorphous strip or ribbon is arranged in a shaping fixture and is annealed in a two-step process with an intermediate cooling step, the annealing process of the first step being carried out with the strip or ribbon firmly fixed in the fixture but with no influence from any magnetic field, and the annealing process of the second step being carried out at a higher temperature with the strip or ribbon no longer being fixed in the fixture and under the influence of a transverse magnetic field.
2 . Method according to claim 1 , c h a r a c t e r ¬ i z e d in a) that the strip or ribbon is put into a two-part fixture adapted to give the strip or ribbon a desired cross-sectional shape, the fixture then being closed and the strip, firmly fixed inside the fixture, being exposed to an annealing process at a temperature of approximately 360°C, b) that the fixture and the strip are cooled down af- ter the annealing process of a) having been completed, and c) that after the cooling, the upper part of the fix¬ ture is removed, and the strip or ribbon, now resting upon the lower part of the fixture, is exposed to a second annealing process in a temperature range between 380°C and 430°C, a transverse magnetic field sufficiently strong to develop a domain structure with a high coupling factor being applied in a manner known per se during the annealing process.
PCT/SE1995/000984 1994-09-02 1995-09-01 Method of manufacture of amorphous transducer elements Ceased WO1996007767A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP8509421A JPH10505710A (en) 1994-09-02 1995-09-01 Manufacturing method of amorphous conversion element
DE69505847T DE69505847T2 (en) 1994-09-02 1995-09-01 MANUFACTURING METHOD FOR AMORPHY TRANSDUCTOR ELEMENT
EP95930779A EP0804628B1 (en) 1994-09-02 1995-09-01 Method of manufacture of amorphous transducer elements

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9402945A SE9402945L (en) 1994-09-02 1994-09-02 Process for producing amorphous transducer elements with high magnetomechanical coupling and with different cross-sectional shapes
SE9402945-1 1994-09-02

Publications (1)

Publication Number Publication Date
WO1996007767A1 true WO1996007767A1 (en) 1996-03-14

Family

ID=20395123

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1995/000984 Ceased WO1996007767A1 (en) 1994-09-02 1995-09-01 Method of manufacture of amorphous transducer elements

Country Status (7)

Country Link
EP (1) EP0804628B1 (en)
JP (1) JPH10505710A (en)
AT (1) ATE173032T1 (en)
CA (1) CA2198927A1 (en)
DE (1) DE69505847T2 (en)
SE (1) SE9402945L (en)
WO (1) WO1996007767A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1154277B (en) * 1960-02-26 1963-09-12 Henschel Werke Ag Process for deforming light metal profiles in aircraft and vehicle construction
DE1533487A1 (en) * 1966-01-10 1970-04-09 Post Vertr Durch Den Leiter De Process for the production of sound carriers for magnetostrictive delay lines, especially for memories with high storage volumes
DE2709626A1 (en) * 1977-03-05 1978-09-07 Vacuumschmelze Gmbh Reducing magnetic reversal losses in amorphous alloys - by heating to temp. above Curie point and below alloy crystallisation temp., and cooling (NL 29.8.78)
EP0318875A1 (en) * 1987-12-05 1989-06-07 Gkss-Forschungszentrum Geesthacht Gmbh Process for rejuvenating the ductility of brittle amorphous alloys
DE3705893C2 (en) * 1986-02-24 1993-05-19 Kabushiki Kaisha Toshiba, Kawasaki, Kanagawa, Jp

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1154277B (en) * 1960-02-26 1963-09-12 Henschel Werke Ag Process for deforming light metal profiles in aircraft and vehicle construction
DE1533487A1 (en) * 1966-01-10 1970-04-09 Post Vertr Durch Den Leiter De Process for the production of sound carriers for magnetostrictive delay lines, especially for memories with high storage volumes
DE2709626A1 (en) * 1977-03-05 1978-09-07 Vacuumschmelze Gmbh Reducing magnetic reversal losses in amorphous alloys - by heating to temp. above Curie point and below alloy crystallisation temp., and cooling (NL 29.8.78)
DE3705893C2 (en) * 1986-02-24 1993-05-19 Kabushiki Kaisha Toshiba, Kawasaki, Kanagawa, Jp
EP0318875A1 (en) * 1987-12-05 1989-06-07 Gkss-Forschungszentrum Geesthacht Gmbh Process for rejuvenating the ductility of brittle amorphous alloys

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 11, No. 3, C-395; & JP,A,61 183 453 (TOSHIBA CORP), 16 August 1986. *
PATENT ABSTRACTS OF JAPAN, Vol. 12, No. 283, C-518; & JP,A,63 060 264 (TOHOKU METAL IND LTD), 16 March 1988. *

Also Published As

Publication number Publication date
SE9402945L (en) 1996-03-03
EP0804628A1 (en) 1997-11-05
ATE173032T1 (en) 1998-11-15
DE69505847D1 (en) 1998-12-10
CA2198927A1 (en) 1996-03-14
JPH10505710A (en) 1998-06-02
SE9402945D0 (en) 1994-09-02
EP0804628B1 (en) 1998-11-04
DE69505847T2 (en) 1999-04-01

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