Abstract:
A glassy metal alloy consists essentially of the formula: FeaCobNicMdBeSifCg, where "M" is at least one member selected form the group consisting of molybdenum, chromium and manganese, "a-g" are in atom percent, "a" ranges from about 30 to about 45, "b" ranges form about 4 to about 40, "c" ranges from about 5 to about 45, "d" ranges from about 0 to about 3, "e" 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 articles surveillance systems. Advantageously, the marker is characterised by relatively linear magnetization response in the frequency regime wherein harmonic marker systems operate magnetically. Voltage amplitudes detected from the marker are high, and interference between surveillance systems based on mechanical resonance and harmonic re-radiance is virtually eliminated.
Abstract:
A glassy metal alloy consists essentially of the formula FeaCobNicMdBeSifCg, 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 8 to about 18, "c" ranges from about 20 to about 45, "d" ranges from about 0 to about 3, "e" ranges from about 12 to about 20, "f" ranges from about 0 to about 5 and "g" ranges from about 0 to about 2. The alloy can be cast by rapid solidification into ribbon, cross-field 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 substantially 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.
Abstract:
A magnetic theft detection system includes a glassy metal alloy strip having a value of magnetostriction near zero. The strip has been annealed to produce a step change in the magnetization versus applied field behavior (B-H loop) thereof, and has a composition consisting essentially of the formula: (Co Fe)100-x (Si B)x where 20
Abstract:
A glassy metal alloy consists essentially of the formula Coa Feb Nic Md Be Sif Cg, where M is selected from molybdenum and chromium and "a", "b", "c", "d", "e", "f" and "g" are in atom percent, "a" ranges from about 40 to about 43, "b" ranges from about 35 to about 42 and "c" ranges from 0 to about 5, "d" ranges from 0 to about 3, "e" ranges from about 10 to about 25, "f" ranges from 0 to about 15 and "g" ranges from 0 to about 2. The alloy can be cast by rapid solidification into ribbon, annealed to enhance magnetic properties thereof, 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.
Abstract translation:玻璃状金属合金基本上由公式Coa Feb Nic Md Be Sif Cg组成,其中M选自钼和铬,“a”,“b”,“c”,“d”,“e”,“f”和 “g”为原子百分数,“a”为约40至约43,“b”为约35至约42,“c”为0至约5,“d”为0至约3, “e”的范围为约10至约25,“f”为0至约15,“g”为0至约2。该合金可以通过快速固化成带进行退火,以提高其磁特性, 形成特别适用于磁机械致动物品监视系统的标记。 有利地,标记的特征在于频率范围内的相对线性的磁化响应,其中谐波标记系统以磁性方式操作。 对于标记检测到的电压幅度很大,基本上消除了基于机械共振和谐波重新辐射的监视系统之间的干扰。
Abstract:
A glassy metal alloy consists essentially of the formula FeaCobNicMdBeSifCg, 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 19 to about 29, 'b' ranges from about 16 to about 42, 'c' ranges from about 20 to about 40, 'd' ranges from about 0 to about 3, 'e' ranges from about 10 to about 20, 'f' ranges from about 0 to about 9 and 'g' ranges from about 0 to about 3. 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 substantially linear magnetization response to an applied magnetic field 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.
Abstract:
A magnetic theft detection system includes a glassy metal alloy strip having a value of magnetostriction near zero. The strip has been annealed to produce a step change in the magnetization versus applied field behavior (B-H loop) thereof, and has a composition consisting essentially of the formula: (Co Fe)100-x (Si B)x where 20 « x « 23 and 15.4 « Co/Fe « 15.9 and 7.5 « B/Si « 9. Annealing of the metal alloy strip in an oxidizing atmosphere causes the formation of a surface oxide followed by a distinctive crystalline Co-layer with thickness in the range of 1 to 2 νm. The thickness of the crystalline Co-layer determines the value of the threshold magnetic field and is controlled by the annealing condition and the as cast surface chemistry and structure.
Abstract:
A glassy metal alloy consists essentially of the formula Coa Feb Nic Md Be Sif Cg, where M is selected from molybdenum and chromium and 'a', 'b', 'c', 'd', 'e', 'f' and 'g' are in atom percent, 'a' ranges from about 40 to about 43, 'b' ranges from about 35 to about 42 and 'c' ranges from 0 to about 5, 'd' ranges from 0 to about 3, 'e' ranges from about 10 to about 25, 'f' ranges from 0 to about 15 and 'g' ranges from 0 to about 2. The alloy can be cast by rapid solidification into ribbon, annealed to enhance magnetic properties thereof, 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.
Abstract:
A glassy metal alloy consists essentially of the formula FeaCobNicMdBeSifCg, 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 8 to about 18, 'c' ranges from about 20 to about 45, 'd' ranges from about 0 to about 3, 'e' ranges from about 12 to about 20, 'f' ranges from about 0 to about 5 and 'g' ranges from about 0 to about 2. The alloy can be cast by rapid solidification into ribbon, cross-field 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 substantially 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.
Abstract:
Alliages magnétiques doux à base de Fe-Ni à particules nanocristallines réparties uniformément dans une matrice amorphe. Les alliages magnétiques doux de l'invention peuvent être représentés par la formule générale:(Fe1-xNix)aMb(B1-ySiy)c, dans laquelle M représente un métal choisi dans le groupe constitué par Mo, Cr, Hf, Nb, Ta, Ni, V, W, Zr. La quantité "x" est comprise entre environ 0,2 et 0,9; a est compris entre environ 60 et 90; b est compris entre 0,1 et 10, y est compris entre 0 et 0,5 et c est compris entre environ 0,1 et environ 30, à la condition que toutes les éléments, plus les impuretés, représentent un total de 100. L'invention concerne également un procédé de production des alliages nanocristallins et d'optimatisation de certaines propriétes magnétiques desdits alliages par recuit en deux étapes.
Abstract:
A magnetic theft detection system includes a glassy metal alloy strip having a value of magnetostriction near zero. The strip has been annealed to produce a step change in the magnetization versus applied field behavior (B-H loop) thereof, and has a composition consisting essentially of the formula: (Co Fe)100-x (Si B)x where 20 « x « 23 and 15.4 « Co/Fe « 15.9 and 7.5 « B/Si « 9. Annealing of the metal alloy strip in an oxidizing atmosphere causes the formation of a surface oxide followed by a distinctive crystalline Co-layer with thickness in the range of 1 to 2 νm. The thickness of the crystalline Co-layer determines the value of the threshold magnetic field and is controlled by the annealing condition and the as cast surface chemistry and structure.