Cells Of Diverse Coercivity Patents (Class 365/133)
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Patent number: 11456105Abstract: A coil component comprising a core having a winding core part, and a coil wound around the winding core part and including a plurality of wires. The coil includes a twisted wire portion in which the plurality of wires is twisted together. The twisted wire portion includes a bank region including a first layer wound multiple turns continuously around the winding core part and a second layer wound on the first layer continuously from the first layer. The bank region is sparsely wound with the number of turns of the second layer reduced by two or more as compared to the number of turns of the first layer.Type: GrantFiled: May 31, 2019Date of Patent: September 27, 2022Assignee: Murata Manufacturing Co., Ltd.Inventors: Takashi Sukegawa, Masashi Miyamoto, Ryota Hashimoto, Chihiro Yamaguchi, Kentaro Yamaguchi
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Patent number: 10571527Abstract: The present disclosure relates to a magnetic sensor device having at least one magneto-resistive structure. The magneto-resistive structure comprises a magnetic free layer configured to generate a closed flux magnetization pattern in the free layer, and a magnetic reference layer having non-closed flux reference magnetization pattern; and a magnetic flux concentrator configured to increase a flux density of an external magnetic field in the magnetic free layer.Type: GrantFiled: May 23, 2017Date of Patent: February 25, 2020Assignee: Infineon Technologies AGInventors: Dieter Suess, Hubert Brueckl, Klemens Pruegl, Wolfgang Raberg, Armin Satz
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Patent number: 10474527Abstract: Systems and methods are disclosed for host assisted error recovery at a data storage device. In an example embodiment, an apparatus comprises a data storage drive including an interface to communicate with a host device, a nonvolatile solid state memory, and a processor. The processor is configured to calculate parity data based on a plurality of pages from the nonvolatile solid state memory, and provide, in response to a request for the parity data received from the host device via the interface, the parity data to the host device with an indication to store the parity data to a nonvolatile storage medium.Type: GrantFiled: June 30, 2017Date of Patent: November 12, 2019Assignee: Seagate Technology LLCInventor: Yaohua Sun
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Patent number: 10310939Abstract: On the basis of data addresses indicative of write bit positions of each of the write data pieces in each of blocks, write page addresses indicative of pages having each of the write data pieces written thereto in each of the blocks are detected. At least one write data piece is incorporated into each of the page data pieces indicated by the write page addresses among k page data pieces corresponding to the k pages, the page data pieces having the write data pieces incorporated therein are used as page data pieces, and an error-correction encoding process is applied to each of the write page data pieces to obtain encoded write data pieces. Then, a voltage based on the encoded write data pieces is applied to each of the memory cells belonging to the pages indicated by the write page addresses.Type: GrantFiled: May 13, 2016Date of Patent: June 4, 2019Assignee: LAPIS Semiconductor Co., Ltd.Inventor: Nobukazu Murata
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Patent number: 9730369Abstract: Provided is a magnetic shielding sheet. The magnetic shielding sheet according to an embodiment of the inventive concept may include a magnetic sheet including a magnetic material, a plurality of first metal strips provided on the magnetic sheet in a first direction, and a plurality of second metal strips provided on the magnetic sheet in a second direction different from the first direction. According to the inventive concept, a magnetic field applied from the outside may be efficiently shielded by properly arranging the metal strips on the magnetic sheet.Type: GrantFiled: February 12, 2016Date of Patent: August 8, 2017Assignee: Electronics and Telecommunications Research InstituteInventors: Sang il Kwak, Jong Hwa Kwon, Hyun Ho Park
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Patent number: 9459835Abstract: In one general embodiment, a system includes at least one magnetic nanoparticle; a heating device for heating the at least one magnetic nanoparticle to induce a paramagnetic thermal instability in the at least one magnetic nanoparticle whereby a magnetization of the magnetic nanoparticle randomly switches between different detectable magnetic states upon heating thereof; and a magnetoresistance reading device for detecting an instantaneous magnetic state of the magnetic nanoparticle.Type: GrantFiled: January 15, 2014Date of Patent: October 4, 2016Assignee: HGST Netherlands B.V.Inventors: Patrick M. Braganca, Jordan A. Katine, Yang Li, Neil L. Robertson, Qingbo Wang, Haiwen Xi
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Patent number: 8917531Abstract: A thermally assisted magnetoresistive random access memory cell, a corresponding array, and a method for fabricating the array. An example cell includes a first metal layer, a second metal layer, an interlayer, a first magnetic stack, and a first non-magnetic via. The first metal layer includes a pad and a first metal line, with the pad not in direct contact with the first metal line. The second metal layer includes a second metal line and a metal strap. The second metal line is perpendicular to the first metal line and not in contact with the metal strap. The interlayer is located between the first and second metal layers. The first metal line is not in direct contact with the interlayer. The first magnetic stack is in direct contact with the interlayer and the metal strap. The first non-magnetic via is in direct contact with the pad and the metal strap.Type: GrantFiled: March 14, 2013Date of Patent: December 23, 2014Assignee: International Business Machines CorporationInventors: Anthony J. Annunziata, John K. DeBrosse
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Patent number: 8656255Abstract: A memory system includes a flash subsystem for storing data identified by page numbers. The memory system further includes a central processing unit (CPU), and a flash controller coupled to the CPU, the CPU being operable to pair a lower with an upper page. Further included in the memory system is a buffer including a page of data to be programmed in a block of the flash subsystem, wherein split segments of pages are formed and concatenated with split error correcting code (ECC), the ECC having a code rate associated therewith.Type: GrantFiled: March 15, 2013Date of Patent: February 18, 2014Assignee: Avalanche Technology, Inc.Inventors: Siamack Nemazie, Anilkumar Mandapuram
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Patent number: 8331137Abstract: According to one embodiment, a nonvolatile semiconductor memory device includes a memory cell includes a variable resistance element and a capacitor connected in series between first and second conductive lines, and a control circuit applying one of first and second voltage pulses to the memory cell. The capacitor is charged by a leading edge of one of the first and second voltage pulses, and discharged a trailing edge of one of the first and second voltage pulses. The control circuit makes waveforms of the trailing edges of the first and second voltage pulses be different, changes a resistance value of the variable resistance element from a first resistance value to a second resistance value by using the first voltage pulse, and changes the resistance value of the variable resistance element from the second resistance value to the first resistance value by using the second voltage pulse.Type: GrantFiled: September 16, 2011Date of Patent: December 11, 2012Assignee: Kabushiki Kaisha ToshibaInventors: Akira Takashima, Reika Ichihara
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Patent number: 7742323Abstract: A structure for a memory device including a plurality of substantially planar thin-film layers or a plurality of conformal thin-film layers is disclosed. The thin-film layers form a memory element that is electrically in series with first and second cladded conductors and operative to store data as a plurality of conductivity profiles. A select voltage applied across the first and second cladded conductors is operative to perform data operations on the memory device. The memory device may optionally include a non-ohmic device electrically in series with the memory element and the first and second cladded conductors. Fabrication of the memory device does not require the plurality of thin-film layers be etched in order to form the memory element. The memory element can include a CMO layer having a selectively crystallized polycrystalline portion and an amorphous portion. The cladded conductors can include a core material made from copper.Type: GrantFiled: July 26, 2007Date of Patent: June 22, 2010Inventors: Darrell Rinerson, Jonathan Bornstein, Robin Cheung, David Hansen, Travis Byonghyop Oh
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Patent number: 7307874Abstract: A magnetic random access memory device may include a memory cell access transistor on a substrate, a bit line spaced apart from the substrate, and a magnetic tunnel junction structure electrically coupled between the bit line and the memory cell access transistor. At least one magnet may be positioned adjacent a sidewall of the magnetic tunnel junction structure and may be configured to provide a magnetic field through the magnetic tunnel junction structure. Related methods of operating magnetic random access memory devices are also discussed.Type: GrantFiled: July 8, 2005Date of Patent: December 11, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Won-Cheol Jeong, Jae-Hyun Park
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Patent number: 7272028Abstract: A magnetoresistive memory cell includes N magnetoresistive elements conductively connected in series (where N is an integer greater than or equal to two). The magnetoresistive elements, respectively, are positioned between at least two adjacent conductive lines. At least one of the conductive lines is a partially split conductive line having at least one slit portion encompassing an interconnect running therethrough and connected to at least one adjacent magnetoresistive element.Type: GrantFiled: May 27, 2005Date of Patent: September 18, 2007Assignees: Infineon Technologies AG, Altis Semiconductor SNCInventor: Ihar Kasko
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Patent number: 7269061Abstract: A magnetic memory has a first, a second and a third magnetic transistor. The first magnetic transistor has a first magnetic section and a second magnetic section, wherein the first magnetic section couples to a high voltage end. The second magnetic transistor has a third magnetic section and a fourth magnetic section, wherein the third magnetic section couples to a low voltage end, and the fourth magnetic section couples to the second magnetic section of the first magnetic transistor. The third magnetic transistor has a fifth magnetic section and a sixth magnetic section, wherein the fifth magnetic section couples with the second magnetic section and the fourth magnetic section together, and the sixth magnetic section couples to an input/output end.Type: GrantFiled: October 13, 2006Date of Patent: September 11, 2007Assignee: Northern Lights Semiconductor Corp.Inventors: Tom Allen Agan, James Chyi Lai
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Patent number: 7239565Abstract: In one embodiment, a memory apparatus is provided with at least one local bit-line; a precharge control circuit, coupled to the at least one local bit-line, and adapted to be operable to initiate a precharge pulse after the at least one local bit-line is discharged and to terminate the precharge pulse after the at least one local bit-line has been precharged; a precharge pull-up device, coupled to the precharge control circuit, a first voltage source, and the at least one local bit-line, and adapted to be operable to connect the first voltage source to the at least one local bit-line during the precharge pulse to precharge the at least one local bit-line; and a selected one of a plurality of evaluation pull-down devices, coupled to a clock source, a second voltage source, and the at least one bit-line, and adapted to be operable to couple the at least one local bit-line to the second voltage source during the clock signal pulse to discharge the at least one local bit-line.Type: GrantFiled: September 29, 2004Date of Patent: July 3, 2007Assignee: Intel CorporationInventor: Yichiuh Liu
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Patent number: 7042753Abstract: A memory cell is constituted by a TMR element and a MOS transistor. The source diffusion layer of the MOS transistor is connected to a source line and the drain diffusion layer of the transistor is connected to a TMR element via a local interconnection wire. The TMR element is held between the local interconnection wire and a bit line. The TMR element is constituted by stacked TMR layers. Each TMR layer is able to have two states, that is, a state in which spin directions are parallel and anti-parallel. Therefore, the TMR element stores four-value data. A current-driving line is set immediately below the TMR element.Type: GrantFiled: February 13, 2002Date of Patent: May 9, 2006Assignee: Kabushiki Kaisha ToshibaInventor: Fumio Horiguchi
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Patent number: 6438019Abstract: The invention relates to a ferroelectric RAM configuration, including a number of storage cells, each of which has a selection transistor and a capacitor device with a ferroelectric dielectric. The capacitor device includes at least two capacitors whose coercive voltages are different from each other.Type: GrantFiled: January 8, 2001Date of Patent: August 20, 2002Assignee: Infineon Technologies AGInventors: Walter Hartner, Günther Schindler, Frank Hintermaier
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Patent number: 4965689Abstract: A reader for a disk-shaped carrier with Wiegand wires is described which manages with only two permanent magnets (1, 2). the variation of the magnetic field needed for detecting the Wiegand wires is effected by flux concentrating pieces (3, 4, 7) attached to the permanent magnets (1, 2). In order to be able to read the carrier with the Wiegand wires without change when it is inserted into the reader rotated by 180.degree. round its longitudinal axis coinciding with the direction of insertion (14), the flux concentrating pieces (3, 4, 7) are arranged symmetrically with respect to the longitudinal axis (14) which is a two-fold axis of symmetry. To pick-up the Wiegand pulses, two E-shaped soft magnetic cores (9) are provided which carry on their center leg an electrical sensor winding (17). The free ends of the legs of the E-shaped cores (9) face one another and are also arranged symmetrically with respect to the longitudinal axis (14).Type: GrantFiled: June 15, 1989Date of Patent: October 23, 1990Assignee: Doduco Kg. Dr. Eugen DurrwachterInventors: Norbert Normann, Erwin Gross, Harald Schlager
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Patent number: 4944270Abstract: An asymmetric excitation type magnetic device is provided with a composite magnetic body composed of a first magnetic layer having a relatively strong coercive force and a second magnetic layer having a relatively weak coercive force which layers are combined so as to have their respective magnetic anisotropy oriented in the same direction. To such a composite magnetic body are applied external positive and negative asymmetric magnetic fields in a specified order thereby to produce variations in magnetic flux due to an escpecially quick magnetization reversal and resultantly to generate steep pulse outputs across a detecting coil.Type: GrantFiled: March 31, 1988Date of Patent: July 31, 1990Inventors: Akira Matsushita, Susumu Abe
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Patent number: 4805146Abstract: The sense voltages of an NDRO core memory including two cores per memory bit are increased by using a "soft write" technique wherein one of the two ferrite cores of each memory bit is written into by a smaller write current than the other. This results in a steeper slope toward the knee of the lower part of the hysteresis characteristic of the first core. The steeper slope results in a larger induced voltage for the first core. This increases the difference between the induced voltages of the two cores, thereby increasing the sense voltage to be detected by the sense circuitry.Type: GrantFiled: April 28, 1986Date of Patent: February 14, 1989Assignee: Quadri CorporationInventors: John F. Bruder, Sam L. Rainwater
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Patent number: 4772813Abstract: An electric pulse generator utilizing a Matteuci effect. An alternating magnetic field is applied to distorted magnetic substances by a permanent magnet rotor, a polarizedly magnetized running sheet or an electric coil. The amorphous magnetic substances generate sharp pulse voltages between its ends, at the specific phase of the alternating magnetic field.Type: GrantFiled: April 22, 1987Date of Patent: September 20, 1988Assignee: Aisin Seiki KabushikikikaishaInventors: Kaneo Mohri, Takeshi Nakane
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Patent number: 4758742Abstract: A pulse generator employs a Wiegand wire module within two soft iron ferro-magnetic elements. Four magnets having appropriate polarities are positioned on faces of the ferro-magnetic elements to provide first and second magnetic circuits. The flux in these two magnetic circuits is collected, conducted and guided by the ferro-magnetic elements toward an air gap between the two guide elements. The center portion of the Wiegand wire is at the air gap. Cylindrical cavities in these two guide elements shield the ends of the Wiegand wire to minimize the incidence of external flux from the Wiegand wire. Saturation of the flux at the air gap between the two guide elements causes leakage flux to be incident on the Wiegand wire.The two magnetic circuits created by the magnets are approximately equal in magnitude and opposite in direction at the Wiegand wire. As a consequence, in the normal state, these two magnetic circuits do not affect the state of the Wiegand wire.Type: GrantFiled: July 14, 1987Date of Patent: July 19, 1988Assignee: Echlin Inc.Inventor: John E. Opie
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Patent number: 4743780Abstract: A pulse generating unit in which a Wiegand wire module is contained within two soft iron ferromagnetic members which act as shunts in that they collect, conduct and guide flux incident on the pulse generating unit toward an air gap between the two shunt elements. the air gap is approximately at the center of the Wiegand wire module. Cylindrical cavities in these two shunt elements shield the ends of the Wiegand wire thereby minimizing the incidence of external flux on the Wiegand wire. Saturation of the flux at the air gap between the two shunts causes leakage of flux to be available to switch the state of the Wiegand wire.Type: GrantFiled: April 14, 1987Date of Patent: May 10, 1988Assignee: Echlin Inc.Inventor: John E. Opie
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Patent number: 4736122Abstract: A read head for a Wiegand wire has an E-core with a pick-up coil for the "1" bit wound on one outer leg and a separate pick-up coil for the "0" bit wound on a second outer leg. The E-core is composed of a relatively thin ferromagnetic E-laminae spaced from a relatively thick E-laminae. Between thin and thick laminae in each leg there is an appropriately polarized magnet. The result is to establish a first field across the face of the read head between the center leg and a first outer leg. This first field reads the one bits. Similarly, a second field between the center leg and the other outer leg reads the zero bits. Each one bit wire is on one side of the code strip and each zero bit wire is on the other side of the code strip so that the one bit and zero bit wires are passed respectively across the first and second reading fields provided by the read head.Type: GrantFiled: April 15, 1987Date of Patent: April 5, 1988Assignee: Echlin Inc.Inventors: John E. Opie, Carroll D. Sloan, John R. Wiegand, deceased
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Patent number: 4635227Abstract: The reading head comprises a core, which carries an electric detector winding and which may be E-shaped for reading two rows of Wiegand wires or U-shaped for reading one row of Wiegand wires. Two platelike permanent magnets are spaced from the outer legs of the core. One pole face of each permanent magnet is covered by a low-reluctance element, which terminates close to the core in a top plan view on the reading surface. The core and the magnets include such an oblique angle that in the reading surface of the reading head each low-reluctance element is spaced in the reading direction from the adjacent free leg end of the core. This arrangement ensures that during the reading operation each Wiegand wire will first enter the relatively extensive magnetic field established between those pole faces which are not covered by low-reluctance elements. Thereafter, the Wiegand wire is trigger and then enters the region between the low-reluctance elements and is saturated in that region.Type: GrantFiled: November 2, 1984Date of Patent: January 6, 1987Assignee: Doduco KG Dr. Eugen DurrwachterInventor: Norbert Normann
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Patent number: 4593209Abstract: A read head for a Wiegand Wire has a low reluctance core on which a pick-up coil is wound. The Wiegand Wires are passed over a face of the core and coil and switch state directly over the core and coil so that the change in the magnetic field is coupled to the coil to produce an output pulse. Outboard of the direction in which the Wiegand Wires travels are first and second magnets that generate the field. In contact with these magnets and bridging both sides of the coil are first and second magnetic shunt members which control and determine the shape of the field. A first magnetic shunt member has a relatively narrow bridge portion which saturates under the field involved and thus there is a large leakage field adjacent to the face of the read head for the purpose of appropriately setting the Wiegand Wires. The second shunt has a much larger bridge portion so that there is much less leakage flux. However this smaller leakage flux is in the opposite direction from the leakage flux from the first shunt.Type: GrantFiled: May 24, 1984Date of Patent: June 3, 1986Assignee: Echlin Inc.Inventor: Carroll D. Sloan
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Patent number: 4484090Abstract: A Wiegand wire module is excited by a non-uniform field, which may vary in time either symmetrically or asymmetrically, to provide a switch in state of the Wiegand wire thereby inducing a pulse in the pickup coil of the module. The non-uniform field has a maximum value in an axial direction at a center portion of the wire and a minimum value in an axial direction at end portions of the wire. As the amplitude of the field is varied to switch the wire, the end portions of the wire remain in a field having a low axial magnitude. The result is an output pulse substantially greater than obtained through symmetric exitation using a uniform field.Type: GrantFiled: January 4, 1982Date of Patent: November 20, 1984Assignee: Echlin Manufacturing CompanyInventors: John R. Wiegand, John E. Opie
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Patent number: 4419742Abstract: The register comprises a soft magnetic layer in which is formed the domain propagation channel, a hard magnetic layer and a domain shift conductor. The propagation channel comprises a writing box, a reading box, narrow domain storage zones, widened domain growth boxes, a domain increasing zone, upstream the reading box, which includes intermediate domain increasing boxes, which have a large surface with respect to that of the other growth boxes. Each increasing box comprises lateral shoulders and is not covered by the shift conductor. A coil or a solenoid creates at the level of the increasing zone and of the reading box, a pulsating external magnetic field.Type: GrantFiled: October 29, 1980Date of Patent: December 6, 1983Assignee: CrouzetInventor: Claude Battarel
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Patent number: 4408122Abstract: A programmable data storage element includes a self-nucleating bi-stable magnetizable wire and a body of permanently magnetizable material such as barium ferrite. The bi-stable magnetic wire is normally readable in a magnetic reader constructed to cause state reversal of the magnetic wire to induce an output pulse in a sensing coil. The body of permanently magnetizable material can be selectively magnetized in the vicinity of the bi-stable magnetic wire to inhibit reading of the wire in the reader. A given wire can thus be programmed to store a binary bit of data by being selectively enabled or disabled for reading in a suitable magnetic reader. An improved passcard may be constructed by including an insert of barium ferrite in a passcard on which are disposed a plurality of bi-stable magnetic wires in a predetermined pattern. The passcard may be encoded with an identification number or other information at any time subsequent to manufacture by magnetizing selected portions of the barium ferrite insert.Type: GrantFiled: January 14, 1981Date of Patent: October 4, 1983Assignee: Soundcraft, Inc.Inventor: Martin S. Casden
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Patent number: 4369344Abstract: A sensitive edge 10 for door systems, lifts, doors, or other moving portions of transit vehicles that come into contact with articles or passengers includes a body defining a resilient deformable leading edge portion 30 and a base portion 32 within which is defined an internal chamber. A coupling portion is defined on and extending from the base for coupling the sensitive edge to the door or similar device 36. The chamber 34 is hollow and at atmospheric pressure and in the preferred embodiment, is filled with air. Within the chamber is mounted a Wiegand wire and pick-up coil 38 that is electrically coupled to a switch for recycling the door or similar device upon engagement of the sensitive edge with an object such as a passenger.Type: GrantFiled: July 26, 1979Date of Patent: January 18, 1983Assignee: Vapor CorporationInventor: John A. Diamond
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Patent number: 4316110Abstract: A signal generating device comprising a bistable magnetic device which alters its magnetic state when the density of magnetic flux to which it is subject passes through a predetermined value, and detecting means providing an output signal responsive to a change in magnetic state of said bistable device. A conducting means for magnetic flux comprises a first portion providing a first path of high permeability and a second portion, and has the bistable device connected between the first and second portions for conducting therebetween and being subjected to the conducted magnetic flux. The second portion provides second and third paths through the bistable device, each having a respectively alterable permeance for varying in an opposite relationship the respective reluctance of the second and third paths of the conducting means and the density and sense of magnetic flux to which the bistable device is subject.Type: GrantFiled: December 26, 1978Date of Patent: February 16, 1982Assignee: TRW, Inc.Inventor: Richard A. Lathlaen
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Patent number: 4309628Abstract: A pulser unit is composed of two high strength magnets spaced apart from one another and establishing an intense magnetic field therebetween. Forward faces of the two magnets establish a working surface for the pulser unit. A Wiegand wire module consisting of a Wiegand wire segment around which a pickup coil is wound is mounted in the pulser unit immediately behind the working surface of the pulser unit and adjacent the sides of the two spaced apart magnets. The magnetic field is sufficiently strong to determine the state of the Wiegand wire. When a low reluctance element is brought adjacent to the front of the working surface, the field is substantially distorted and the field to which the Wiegand wire is subjected changes materially. The result is that the Wiegand wire switches state and the substantial rate of change of the flux in that switching of state is sensed by the pickup coil to provide an output pulse.Type: GrantFiled: February 22, 1980Date of Patent: January 5, 1982Assignee: The Echlin Manufacturing CompanyInventor: John R. Wiegand
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Patent number: 4287573Abstract: Method and means for coupling an elongated magnetic device such as a "Wiegand" wire to a magnetic circuit comprising the steps of shaping the ends of an elongated magnetic device to provide a high ratio of surface area to volume and a contact surface at each end, and connecting the contact surface of each end of said magnetic device to a conforming portion of a respective one of a pair of spaced ends of a flux conductive means to provide a magnetic path through said conductive means and magnetic device. The ends of the magnetic device are shaped by being compressed to provide flat surfaces on opposite sides and are connected by electric welding, clamping, soldering or adhering same with the flux conductive means. In one form the conductive means is provided with a shunt path for magnetic flux for reducing the reluctance of the coupling means, and controlling the proportion of magnetic flux passing through the elongated magnetic device.Type: GrantFiled: August 7, 1978Date of Patent: September 1, 1981Assignee: TRW, Inc.Inventor: Richard A. Lathlaen
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Patent number: 4263523Abstract: A read head for a Wiegand type wire establishes an asymmetric field to which the wire is subjected. A setting magnet at a first position establishes a sufficiently strong positive field to set the core and shell of the Wiegand wire in a first confluent state. At a second position, the field is sufficiently negative so as to assure that the core switches state thereby establishing a reverse state for the wire. The field does not go strongly negative and thus the state of the shell is not reversed. At a third position, the field becomes sufficiently positive so as to cause the core to reverse its state again thereby switching the wire from its reverse state to its confluent state. This particular switching occurs in close proximity to the pickup coil thereby providing an output pulse in response to the switch of state of the wire from reverse state to confluent state.Type: GrantFiled: September 17, 1979Date of Patent: April 21, 1981Assignee: The Echlin Manufacturing CompanyInventor: John R. Wiegand
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Patent number: 4263525Abstract: A signal generating means comprising a bistable magnetic device which alters its magnetic state when the density of magnetic flux to which it is subject passes through a predetermined value, and detecting means providing an output signal responsive to a change in magnetic state of said bistable device. A conducting means comprising first and second portions conducts magnetic flux in first and second paths and subjects the bistable magnetic device which is connected between the first and second portions to the conducted magnetic flux. The second portion provides the second path with an alterable permeance for varying the reluctance of the second path of the conducting means, and an energizing means provides magnetic flux to the conducting means having a sense along the first path through the bistable device which is opposite to its sense in the second path.Type: GrantFiled: April 23, 1979Date of Patent: April 21, 1981Assignee: TRW, Inc.Inventor: Richard A. Lathlaen
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Patent number: 4247601Abstract: The magnetic switching device which employs what has come to be known as the Wiegand Effect is described in U.S. Pat. No. 3,820,090. What is disclosed herein is an improved switching device made from an alloy of iron, cobalt and vanadium that provides a greater switching effect. An improved or optimized torsional strain routine for fabricating the wire switching device is also disclosed. The improved switching device provides its maximum output pulse when the wire is switched in an asymmetric fashion.Type: GrantFiled: April 18, 1978Date of Patent: January 27, 1981Assignee: The Echlin Manufacturing CompanyInventor: John R. Wiegand
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Patent number: 4242789Abstract: A magnetic encoding device and method for making the same are provided for use as magnetic storage mediums in identification control applications which give output signals from a reader that are of shorter duration and substantially greater magnitude than those of the prior art. Magnetic encoding elements are produced by uniformly bending wire or strip stock of a magnetic material longitudinally about a common radius to exceed the elastic limit of the material and subsequently mounting the material so that it is restrained in an unbent position on a substrate of nonmagnetic material. The elements are spot weld attached to a substrate to form a binary coded array of elements according to a desired binary code. The coded substrate may be enclosed in a plastic laminate structure. Such devices may be used for security badges, key cards, and the like and may have many other applications.Type: GrantFiled: March 16, 1979Date of Patent: January 6, 1981Assignee: The United States of America as represented by the United States Department of EnergyInventor: Richard J. Fox
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Patent number: 4236230Abstract: A device includes a core, such as a wire or cylinder of a solid material such as nonmagnetic metal, coated with a film of a material having a high degree of magnetostriction and a uniaxial helical magnetic anisotropy at an oblique angle to the longitudinal axis of the core. The device has the characteristic of being magnetically bistable and of providing a large magnetic pulse as it changes to one of its stable states in response to passage of a magnetic field by it. To achieve a helical magnetic anisotropy, the magnetostrictive film can be applied to a nonmagnetic wire by plating the wire while it is under torsion, twisting a plated wire after plating, or by applying an electric current and a magnetic field to the wire as the film is being plated or annealed.Type: GrantFiled: December 19, 1977Date of Patent: November 25, 1980Assignee: International Business Machines CorporationInventor: David A. Thompson
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Patent number: 4205393Abstract: A magnetic domain storage device comprising a ferromagnetic, polycrystalline metal layer which is applied to a support and comprises areas of different coercivity, the areas of lower coercivity in the form of strip-shaped channels being surrounded by areas of higher coercivity; a system of electrical conductors, extending in planes arranged parallel and in close vicinity to the ferromagnetic layer for creating, propagating and detecting magnetic domains in the channels of lower coercivity; and a baseplate with electrical connections. The areas of lower coercivity follow a path similar to a spiral with its one end adjacent to the center of the support and the other end adjacent to a corner of the support and executing at least one full 360.degree. turn between both ends. The domain storage devices of this type are distinguished by a higher storage capacity.Type: GrantFiled: March 16, 1978Date of Patent: May 27, 1980Assignee: BASF AktiengesellschaftInventors: Herbert Henkler, Roland Koenig, Hermann Deichelmann, Volker Koch
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Patent number: 4109317Abstract: A magnetic thin film storage device of simplified design working on the shift register principle and comprising a flat support to which a ferromagnetic layer has been applied, which layer contains regions of different coercivity, lower-coercivity regions being surrounded by regions of higher coercivity, and also comprising electric conductors extending in planes which are parallel to the support, the conductors serving to produce the magnetic fields required to propagate magnetic domains into the lower-coercivity regions, at least one group of channels being provided which terminate in the same enlarged lower-coercivity area, and the magnetic domains contained in the channels terminating in the said enlarged area being propagated individually and consecutively into that enlarged area.Type: GrantFiled: February 20, 1976Date of Patent: August 22, 1978Assignee: BASF AktiengesellschaftInventors: Herbert Henkler, Hermann Deichelmann, Roland Koenig, Volker Koch, Bernd Roeger