Abstract: Magnetic powder having a large coercivity, Hc, is consolidated with a non-magnetic binder to form a magnetic implement having desired dimension and shape. The magnetic implement exhibits a linear B-H loop and low magnetic loss. It is capable of operating under a wide magnetic field range, and finds use current and pulse transformers, inductors carrying large electrical current, stable bandpass filters, and the like.

Abstract: A metallic glass alloy ribbon consists essentially of about 70 to 87 atom percent iron. Up to about 20 atom percent of the iron is replaced by cobalt and up to about 3 atom percent of the iron is replaced by nickel, manganese, vanadium, titanium or molybdenum. About 13-30 atom percent of the element balance comprises a member selected from the group consisting of boron, silicon and carbon. The alloy is heat-treated at a sufficient temperature to achieve stress relief. A magnetic field applied during the heat-treatment causes the magnetization to point away from the ribbon's predetermined easy magnetization direction. The metallic glass exhibits linear DC BH loops with low ac losses. As such they are especially well suited for use in current/voltage transformers.

Abstract: A bulk amorphous metal inductive device comprises a magnetic core having at least low-loss bulk ferromagnetic amorphous metal magnetic component forming a magnetic circuit having an air gap therein. The device has one or more electrical windings and may be used as a transformer or inductor in an electronic circuit. The component comprises a plurality of similarly shaped layers of amorphous metal strips bonded together to form a polyhedrally shaped part. The low core losses of the device, e.g. a loss of at most about 12 W/kg when excited at a frequency of 5 kHz to a peak induction level of 0.3 T, make it especially useful for application in power conditioning circuits operating in switched mode at frequencies of 1 kHz or more. The component is fabricated by a process comprising cutting laminations of the requisite shape. The cut laminations are stacked and registered, and then bonded by an adhesive agent. The cutting of laminations is advantageously done with stamping or photolithographic etching techniques.

Abstract: A bulk amorphous metal inductive device comprises a magnetic core having plurality of low-loss bulk ferromagnetic amorphous metal magnetic components assembled in juxtaposed relationship to form at least one magnetic circuit and secured in position, e.g. by banding or potting. The device has one or more electrical windings and may be used as a transformer or inductor in an electronic circuit. Each component comprises a plurality of similarly shaped layers of amorphous metal strips bonded together to form a polyhedrally shaped part. The low core losses of the device, e.g. a loss of at most about 12 W/kg when excited at a frequency of 5 kHz to a peak induction level of 0.3 T, make it especially useful for application in power conditioning circuits operating in switched mode at frequencies of 1 kHz or more. Air gaps are optionally interposed between the mating faces of the constituent components of the device to enhance its energy storage capacity for inductor applications.

Abstract: Electronic article surveillance markers, methods for their production and for their use are disclosed. In one aspect there is provided an integrated deactivatable hybrid marker which can be used both in radio frequency and magnetic harmonic article surveillance systems. The harmonics generating element or elements of the marker are inserted into a RF resonant circuit as an active part of the circuit. The deactivation of the marker is accomplished by employing another element of high coercivity magnetic material. When placed in a RF interrogation field, the hybrid marker causes an increase in absorption of transmitted signal in order to reduce the signal in the receiving coil of the RF surveillance system. When placed in an interrogation zone of a magnetic harmonic article surveillance system, the marker generates high harmonics of the interrogating frequency that can be detected by the receiver of the surveillance system.

Abstract: A harmonic responsive electronic article surveillance marker is associated with a central, non-recorded region and/or a peripheral non-recorded region of an optically recorded or recordable media. The marker comprising at least one elongated strip, optionally having an arcuate configuration, and composed of soft magnetic material adapted to generate a harmonic signal voltage in the presence of an applied magnetic field which provides the marker with signal identity. Advantageously, the marker is inexpensive to construct. It is readily attached to or embedded in the non-recorded region and/or the peripheral non-recorded region, and generates a high amplitude, harmonic signal voltage having significantly increased detection sensitivity. With these attributes, the marker is especially suited for electronic surveillance of recorded media such as compact disks, digital video disks, laser disks and the like.

Abstract: A magnetic core has a toroidal configuration, formed by winding an iron-based amorphous metal ribbon. Thereafter the core is heat-treated to achieve a linear B-H characteristic. Advantageously, the linear B-H characteristic does not change with the level of magnetic fields applied and the frequency utilized. With such properties, the core is especially suited for use in a current transformer.

Abstract: A filter circuit is used to select frequency bands of digital and analog signals over communications channels in a DSL communications system. The filter circuit includes an inductor having a core that consists essentially of an Fe-base amorphous metal alloy. Advantageously, the filter circuit provides as good or better performance than a filter circuit using a Co-base core; but is much less expensive. As such, it provides a low cost, high efficiency solution to communications applications, such as DSL communications systems, and the like.

Abstract: A metallic glass alloy ribbon consists essentially of about 70 to 87 atom percent iron. Up to about 20 atom percent of the iron is replaced by cobalt and up to about 3 atom percent of the iron is replaced by nickel, manganese, vanadium, titanium or molybdenum. About 13-30 atom percent of the element balance comprises a member selected from the group consisting of boron, silicon and carbon. The alloy is heat-treated at a sufficient temperature to achieve stress relief. A magnetic field applied during the heat-treatment causes the magnetization to point away from the ribbon's predetermined easy magnetization direction. The metallic glass exhibits linear DC BH loops with low ac losses. As such they are especially well suited for use in current/voltage transformers.

Abstract: A harmonic responsive electronic article surveillance marker is associated with a central, non-recorded region and/or a peripheral non-recorded region of an optically recorded or recordable media. The marker comprising at least one elongated strip, optionally having an arcuate configuration, and composed of soft magnetic material adapted to generate a harmonic signal voltage in the presence of an applied magnetic field which provides the marker with signal identity. Advantageously, the marker is inexpensive to construct. It is readily attached to or embedded in the non-recorded region and/or the peripheral non-recorded region, and generates a high amplitude, harmonic signal voltage having significantly increased detection sensitivity. With these attributes, the marker is especially suited for electronic surveillance of recorded media such as compact disks, digital video disks, laser disks and the like.

Abstract: Disclosed are a gapped magnetic core which may be coated or uncoated with an insulating layer or housed in an insulting box having a physical gap whose dimension is close to that of the gapped magnetic core and automated or semi-automated methods of applying copper wire on the gapped core or the core assembly and filling the gap with a spacer in the core or core assembly. The disclosed processes allow various combinations of core and spacer materials and gap configurations, resulting in a wide variety of core-coil assemblies which are useful as inductive components in electric and electronic circuits. Also disclosed is a core-coil assembly wherein a magnetic core with a gap directed off the conventional radial direction of a toroidally-wound core.

Abstract: A glassy metal alloy consists essentially of the formula CoaNibFecMdBeSifCg, where M is at least one element selected from the group consisting of Cr, Mo, Mn and Nb, “a-g” are in atom percent and the sum of “a-g” equals 100, “a” ranges from about 25 to about 60, “b” ranges from about 5 to about 45, “c” ranges from about 6 to about 12, “d” ranges from about 0 to about 3, “e” ranges from about 5 to 25, “f” ranges from about 0 to about 15 and “g” ranges from about 0 to 6, said alloy having a value of the saturation magnetostriction between −3 ppm and +3 ppm. The alloy can be cast by rapid solidification from the melt into ribbon, sheet or wire form. The alloy exhibits non-linear B—H hysteresis behavior in its as-cast condition.

Abstract: A glassy metal alloy consists essentially of the formula CoaNibFecMdBeSifCg where M is at least one element selected from the group consisting of Cr, Mo, Mn and Nb, “a-g” are in atom percent and the sum of “a-g” equals 100, “a” ranges from about 25 to about 60, “b” ranges from about 5 to about 45, “c” ranges from about 6 to about 12, “d” ranges from about 0 to about 3, “e” ranges from about 5 to 25, “f” ranges from about 0 to about 15 and “g” ranges from about 0 to 6, said alloy having a value of the saturation magnetostriction between −3 ppm and +3 ppm. The alloy can be cast by rapid solidification from the melt into ribbon, sheet or wire form. The alloy exhibits rounded or rectangular or sheared B-H hysteresis behaviors in its as-cast condition.

Abstract: An integrated deactivatable hybrid marker is disclosed which can be used both in radio frequency and magnetic harmonic article surveillance systems. The harmonics generating element or elements of the marker are inserted into a RF resonant circuit as an active part of the circuit. The deactivation of the marker is accomplished by employing another element of high coercivity magnetic material. When placed in a RF interrogation field, the hybrid marker causes an increase in absorption of transmitted signal in order to reduce the signal in the receiving coil of the RF surveillance system. When placed in an interrogation zone of a magnetic harmonic article surveillance system, the marker generates high harmonics of the interrogating frequency that can be detected by the receiver of the surveillance system. In addition both the RF and harmonic functions of the hybrid marker can be deactivated by a single process.

Abstract: Electronic article surveillance markers, methods for their production and for their use are disclosed. In one aspect there is provided an integrated deactivatable hybrid marker which can be used both in radio frequency and magnetic harmonic article surveillance systems. The harmonics generating element or elements of the marker are inserted into a RF resonant circuit as an active part of the circuit. The deactivation of the marker is accomplished by employing another element of high coercivity magnetic material. When placed in a RF interrogation field, the hybrid marker causes an increase in absorption of transmitted signal in order to reduce the signal in the receiving coil of the RF surveillance system. When placed in an interrogation zone of a magnetic harmonic article surveillance system, the marker generates high harmonics of the interrogating frequency that can be detected by the receiver of the surveillance system.

Abstract: A glassy metal alloy consists essentially of the formula CoaNibFecMdBeSifCg where M is at least one element selected from the group consisting of Cr, Mo, Mn and Nb, “a-g” are in atom percent and the sum of “a-g” equals 100, “a” ranges from about 25 to about 60, “b” ranges from about 5 to about 45, “c” ranges from about 6 to about 12, “d” ranges from about 0 to about 3, “e” ranges from about 5 to 25, “f” ranges from about 0 to about 15 and “g” ranges from about 0 to 6, said alloy having a value of the saturation magnetostriction between −3 ppm and +3 ppm. The alloy can be cast by rapid solidification from the melt into ribbon, sheet or wire form. The alloy exhibits rounded or rectangular or sheared B-H hysteresis behaviors in its as-cast condition.

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.

Abstract: An electrical choke comprises a magnetic amorphous metal core having, in combination, a distributed gap and a discrete gap. The amorphous metal is an iron based, rapidly solidified alloy. The distributed gap configuration is achieved by subjecting the magnetic core to a heat treatment, causing partial crystallization of the amorphous alloy. Such partial volume crystallization reduces the permeability of the magnetic core from several thousands to a value ranging from 200 to 800. The discrete gap is introduced by cutting the core and inserting a spacer. Depending on the width of the gap and the value of the annealed permeability, effective permeabilities in the range of 200 to 40 can be achieved. Advantageously, the reduced permeability magnetic core maintains its initial permeability under DC bias field excitation and exhibits low core loss, making it especially suited for use in power factor correction applications.

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 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.

Abstract: A mechanically resonant marker comprises a strip of magnetic glassy metal alloy that has been annealed in a furnace for a predetermined time at a plurality of temperatures. A first of the temperatures is high enough to relieve quenched-in and post fabrication stresses. The second of the temperatures is near the Curie temperature of the strip. Annealing is carried out in the presence of an external magnetic field applied perpendicular to the strip's length and in the plane of the strip. The second of the temperatures is applied sequentially of the first temperature and is operative to induce magnetic anisotropy along the direction of the magnetic field. Annealing is continuous and the annealing time is determined by the velocity of the strip passing through the annealing furnace.