Patent ID: 6475303
Filing Date: 2002-11-05
Classification: C22C,C22F,G08B,H01F

Abstract:
A magnetic maker for an electronic article surveillance system utilizing magnetic harmonics,said maker comprising a strip, in ribbon or wire form, made of an as-cast magnetic alloy that is at least 70% glassy; said as-cast magnetic alloy having formula CoaNibFecMdBeSifCg wherein M is at least one element selected from the group consisting of Cr, Mo, Mn and Nb, â€œa-gâ€  are in atom percent and the sum of â€œa-gâ€  equals 100, â€œaâ€  ranges froth about 25 to about 60, â€œbâ€  ranges from about 5 to about 45, â€œcâ€  ranges from about 6 to about 12, â€œdâ€  ranges from about 0 to about 3, â€œeâ€  ranges from about 5 to 25, â€œfâ€  ranges from about 0 to about 15 and â€œgâ€  ranges from about 0 to 6; and said alloy having a value of the saturation magnetostriction between âˆ’3Ã—10âˆ’6 and +3Ã—10âˆ’6, a value of saturation induction exceeding 0.5 T, and a non-linear Bâ€”H hysteresis loop having a Bâ€”H squareness ratio exceeding about 0.66 under dc excitation.