Amorphous alloys for magneto-acoustic markers having reduced, low or zero cobalt content, and associated article surveillance system

US7088247B2 · kind B2 · utility

Assignees

• Vacuumschmelze GmbH & Co. KG · DE
• Sensormatic Electronics, LLC · US

Inventors

• Giselher Herzer · Bruchköbel, DE
• Nen-Chin Liu · Coral Springs, US

Key dates

• Filing date: Oct 8, 2003
• Grant date: Aug 8, 2006
• Expiry date: Sep 1, 2024

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01F1/15341
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A ferromagnetic resonator for use in a marker in a magnetomechanical electronic article surveillance system is manufactured at reduced cost by being continuously annealed with a tensile stress applied along the ribbon axis and by providing an amorphous magnetic alloy containing iron, cobalt and nickel and in which the portion of cobalt is less than about 4 at %.