Metallic glass alloys for mechanically resonant marker surveilla

Details Metallic glass alloys for mechanically resonant marker surveilla Metallic glass alloys for mechanically resonant marker surveilla

1995-06-06

1997-07-22

Sheehan, John

Metal treatment

Stock

Magnetic

148315, 148108, 420581, H01F 1153

Patent

active

056500238

ABSTRACT:
A glassy metal alloy consists essentially of the formula Fe.sub.a Co.sub.b Ni.sub.c M.sub.d B.sub.c Si.sub.f C.sub.g, where "M" is at least one member selected from the group consisting of molybdenum, chromium and manganese, "a-g" are in atom percent, "a" ranges from about 30 to about 45, "b" ranges from about 4 to about 40, "c" ranges from about 5 to about 45, "d" ranges from about 0 to about 3, "3" ranges from about 10 to about 25, "f" ranges from about 0 to about 15 and "g" ranges from about 0 to about 2. The alloy can be cast by rapid solidification into ribbon, annealed to enhance magnetic properties, and formed into a marker that is especially suited for use in magneto-mechanically actuated article surveillance systems. Advantageously, the marker is characterized by relatively linear magnetization response in the frequency regime wherein harmonic marker systems operate magnetically. Voltage amplitudes detected for the marker are high, and interference between surveillance systems based on mechanical resonance and harmonic re-radiance is virtually eliminated.

REFERENCES:
patent: 4152144 (1979-05-01), Hasegawa et al.
patent: 4221592 (1980-09-01), Ray
patent: 4484184 (1984-11-01), Gregor et al.
patent: 4510489 (1985-04-01), Anderson et al.
patent: 5015993 (1991-05-01), Strom-Olsen et al.

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