Patent ID: 6551416
Filing Date: 2003-04-22
Classification: C21D,G08B,H01F,Y10T

Abstract:
A method for making a resonator for use in a marker containing a bias element, which produces a bias magnetic field, in a magnetomechanical electronic article surveillance system, said method comprising the steps of:providing a planar ferromagnetic ribbon composed of an amorphous alloy having a thickness and a ribbon axis extending along a longest dimension of said ferromagnetic ribbon, and a ribbon plane; annealing said ferromagnetic ribbon and by said annealing producing in said ferromagnetic ribbon a fine domain structure having a maximum width selected from the group consisting of 40 &mgr;m and 1.5 times said thickness, an anisotropy with a component out of said ribbon plane, and an induced magnetic easy axis substantially perpendicular to said ribbon axis; and cutting a piece of said annealed ferromagnetic ribbon to form a resonator.