Abstract: A magnetic core-coil assembly generates an ignition event in a spark ignition internal combustion system having at least one combustion chamber. The assembly comprises a magnetic core of amorphous metal having a primary coil for low voltage excitation and a secondary coil for a high voltage output to be fed to a spark plug. A high voltage is generated in the secondary coil within a short period of time following excitation thereof. The assembly senses spark ignition conditions in the combustion chamber to control the ignition event.

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.

Abstract: A glassy metal alloy consists essentially of the formula Fe.sub.a Co.sub.b Ni.sub.c M.sub.d B.sub.e 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 or otherwise 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.

Abstract: A glassy metal alloy consists essentially of the formula Co.sub.a Fe.sub.b Ni.sub.c M.sub.d B.sub.e Si.sub.f C.sub.g, 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.

Abstract: A glassy metal alloy consists essentially of the formula Co.sub.a Fe.sub.b Ni.sub.c M.sub.d B.sub.e Si.sub.f C.sub.g, where M is selected from molybdenum 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 or otherwise 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 process for making a large number of magneto-mechanically resonant markers having distinct resonant characteristics is disclosed. The process comprises modifying at least one surface of a glassy metal alloy strip so as to cause the effective length of the alloy strip to be different from the physical length thereof. Resonant markers comprising alloy strips treated by the process of the present invention display unique and distinguishable resonant characteristics which gives the marker a unique identity. The resonant markers can be used for article surveillance, inventory control and personnel identification.

Abstract: Metallic glasses having high permeability, low coercivity, low ac core loss, low exciting power, and high thermal stability are disclosed. The metallic glasses are substantially completely glassy and consist essentially of about 71 to 79 atom percent iron, about 1 to 6 atom percent of at least one member selected from the group consisting of chromium, molybdenum, tungsten, vanadium, niobium, tantalum, titanum, zirconium and hafnium, about 12 to 24 atom percent boron, about 1 to 8 atom percent silicon, 0 to about 2 atom percent carbon, plus incidental impurities, the total of boron, silicon and carbon present ranging from about 18 to 28 atom percent. The alloy is heat treated at a temperature and for a time sufficient to achieve stress relief without inducing precipitation of discrete particles therein. Such a metallic glass alloy is especially suited for use in devices requiring high response to weak magnetic fields, such as ground fault interruptors and current/potential transformers.

Abstract: Metallic glasses having high permeability, low coercivity, low ac core loss, low exciting power, and high thermal stability are disclosed. The metallic glasses are substantially completely glassy and consist essentially of about 71 to 79 atom percent iron, about 1 to 6 atom percent of at least one member selected from the group consisting of chromium, molybdenum, tungsten, vanadium, niobium, tantalum, titanium, zirconium and hafnium, about 12 to 24 atom percent boron, about 1 to 8 atom percent silicon, 0 to about 2 atom percent carbon, plus incidental impurities, the total of boron, silicon and carbon present ranging from about 18 to 28 atom percent. The alloy is heated treated at a temperature and for a time sufficient to achieve stress relief without inducing precipitation of discrete particles therein. Such a metallic glass alloy is especially suited for use in devices requiring high response to weak magnetic fields, such as ground fault interruptors and current/potential transformers.

Abstract: A method and apparatus are provided for monitoring in situ the transformation of some fraction of a starting material to another material during the course of a thermal treatment. The starting material is heated to a preselected temperature and its resistivity is measured. A signal is transmitted to an actuator, which indicates cooling of the material when a preselected resistivity or change therein is detected.

Abstract: A ground fault interrupter is adapted to be connected to a circuit having a supply current and a return current. The interrupter has a detection mechanism, including one or more than one cores, for detecting one or more than one ground fault currents. The core is composed of a metal alloy which is at least about 90 percent glassy and which consists essentially of a composition having the formula Co.sub.a Fe.sub.b Ni.sub.c M.sub.d B.sub.e Si.sub.f where M is at least one selected from a group consisting of Cr, Mo, Mn and Nb, the quantity a, b, c, d, e and f are in atom percent and the sum (a+b+c+d+e+f) is equal to 100 where "a" ranges from about 66 to 71, "b" ranges from about 2.5 to 4.

Abstract: A series of glassy metal alloys with near zero magnetostriction and Perminvar characteristics of relatively constant permeability at low magnetic field excitations and constricted hysteresis loops is disclosed. The glassy alloys have the compositions Co.sub.a Fe.sub.b Ni.sub.c M.sub.d B.sub.e Si.sub.f where M is at least one member selected from the group consisting of Cr, Mo, Mn and Nb, and "a-f" are in atom percent where "a" ranges from about 66 to 71, "b" ranges from about 2.5 to 4.5, "c" ranges from about 0 to 3, "d" ranges from about 0 to 2 except when M.dbd.Mn in which case "d" ranges from about 0 to 4, "e" ranges from about 6 to 24 and "f" ranges from about 0 to 19, with the proviso that the sum of "a", "b" and "c" ranges from about 72 to 76 and the sum of "e" and "f" ranges from about 25 to 27. The glassy alloy has a value of magnetostriction ranging from about -1.times.10.sup. -6 to about +1.times.10.sup.-6, a saturation induction ranging from about 0.

Abstract: Metallic glasses having high permeability, low magnetostriction, low coercivity, low ac core loss, low exciting power and high thermal stability are disclosed. The metallic glasses consist essentially of a composition defined by the formula Fe.sub.a M.sub.b B.sub.c Si.sub.d C.sub.e in which "a"-"e" are in atom percent, the sum ("a"+"b"+"c"+"d"+"e") equals 100, M is at least one element selected from the group consisting of Mo, Cr, Ti, Zr, Hf, Nb, Ta, V and W, "a" ranges from about 66 to 81.5, "b" ranges from about 0.5 to 6, "c" ranges from about 10 to 26, "d" ranges from about 1 to 12, "e" ranges from about 0 to 2 and the sum ("c"+"d"+"e") ranges from about 18 to 28, and have been annealed at a temperature, T.sub.a, for a time, t.sub.a, sufficient to induce precipitation of discrete particles therein. Such metallic glasses are suitable for use in tape recorder heads, relay cores, transformers and the like.

Abstract: Metallic glasses having high permeability, low coercivity, low ac core loss, low exciting power, and high thermal stability are disclosed. The metallic glasses are substantially completely glassy and consist essentially of about 58 to 81 atom percent iron, from 1 to about 10 atom percent of at least one member selected from the group consisting of nickel and cobalt, about 1 to 6 atom percent of at least one member selected from the group consisting of chromium, molybdenum, vanadium, niobium, and zirconium, about 11 to 27.5 atom percent boron about 0.5 to 8 atom percent silicon, 0 to about 2 atom percent carbon, plus incidental impurities, the total of born, silicon and carbon present ranging from about 17 to 28 atom percent. The alloy is heat treated at a temperature and for a time sufficient to achieve stress relief without inducing precipitation of discrete particles therein.

Abstract: A magnetic identification system marker is adapted to generate magnetic fields at frequencies that (1) are harmonically related to an incident magnetic field applied within an interrogation zone and (2) have both even and odd harmonics of the incident field frequency that provide the marker with signal identity, and coding capability. The marker is an elongated, ductile strip of amorphous ferromagnetic material.

Abstract: A method and apparatus are provided for monitoring in situ the transformation of some fraction of a starting material to another material during the course of a thermal treatment. The starting material is heated to a preselected temperature and its permeability is measured. A signal is transmitted to an actuator, which indicates cooling of the material when a preselected or change therein is detected.

Abstract: A magnetic theft detection system marker is adapted to generate magnetic fields at frequencies that (1) are harmonically related to an incident magnetic field applied within an interrogation zone and (2) have selected tones that provide the marker with signal identity. The marker is an elongated, ductile strip of amorphous ferromagnetic material having a value of magnetostriction near zero that retains its signal identity under stress.

Abstract: Ferromagnetic substitutional solid solution alloys characterized by high saturation magnetization, low or near-zero magnetostriction and having a bcc structure are provided. The alloys consist essentially of about 1 to 9 atom percent boron, balance essentially iron plus incidental impurities.

Abstract: Ferromagnetic substitutional solid solution alloys characterized by high saturation magnetization, low or near-zero magnetostriction and having a bcc structure are provided. The alloys consist essentially of about 1 to 9 atom percent boron, balance essentially iron plus incidental impurities.

Abstract: A method for making magnetic crystallized implements based on glassy metal alloys. Metallic glass alloy powder of suitable ferromagnetic composition is compacted by mechanical, by adhesive bonding or by thermomechanical processes. The resulting compacts can be heat treated to enhance magnetic properties. Compacted bodies exhibit excellent ferromagnetic properties, low remanence, low coercivity and high permeabilities.

Abstract: A magnetic theft detection system marker is adapted to generate magnetic fields at frequencies that (1) are harmonically related to an incident magnetic field applied within an interrogation zone and (2) have selected tones that provide the marker with signal identity. The marker is an elongated, ductile strip of amorphous ferromagnetic material having a value of magnetostriction near zero that retains its signal identity under stress.