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| Number | Title | Issue Date |
| 8004278 | Techniques for electrically characterizing tunnel junction film stacks with little or no processing Probes are electrically connected to a surface of a tunnel junction film stack comprising a free layer, a tunnel barrier, and a pinned layer. Resistances are determined for a variety of probe spacings and for a number of magnetizations of one of the layers of the st... | 08/23/2011 |
| 7241349 | Nondestructive evaluating method for aged deterioration in austenitic stainless steel A nondestructive evaluating method for aged deterioration in austenitic stainless steel comprises an information obtaining step for previously obtaining a relationship between an applied stress σ and the first ratio Ms/χH* between a saturation magnetiza... | 07/10/2007 |
| 7164263 | Current sensor A current sensor is described that uses a plurality of magnetic field sensors positioned around a current carrying conductor. The sensor can be hinged to allow clamping to a conductor. The current sensor provides high measurement accuracy for both DC and AC currents... | 01/16/2007 |
| 7093509 | Scanning probe microscopy apparatus and techniques Scanning probe techniques based on the measurement of impedance spectroscopy using a conductive an SPM tip is provided and applied to the study of local transport properties, especially at a grain boundary. The contributions of the grain boundaries and tip-surface i... | 08/22/2006 |
| 7009390 | Method and device for characterizing ferroelectric materials The invention relates to a method for characterizing a ferroelectric material, comprising application of an electric voltage to a sample of said ferroelectric material, measuring the electric current flowing through said sample, and joint treatment of the applied vo... | 03/07/2006 |
| 6621913 | Digital oscilloscope with trigger qualification based on pattern recognition A pattern recognition system to qualify valid triggering for digital storage oscilloscopes. Valid trigger qualification may be established from recognition of triggering level and interval time information, as well as other pattern-related information, to... | 09/16/2003 |
| 6538432 | Hysteresis loop tracer with symmetric balance coil A geometry for a pickup coil assembly that improves the balance of a hysteresis loop tracer is described. First and second balance coils are placed on either side of a pickup coil. The first and second balance coils are wired in series to form a symmetric... | 03/25/2003 |
| 6528993 | Magneto-optical microscope magnetometer A magneto-optical microscope magnetometer capable of simultaneously measuring a hysteresis loop and activation magnetic moment of a submicrometer-scale local area (about 0.3×0.3 μm). An electromagnet capable of applying a magnetic field to a magnetic ma... | 03/04/2003 |
| 6424149 | Nondestructive fatigue test method for ferromagnetic construction materials A nondestructive test method determines the degree of metal fatigue of test ferromagnetic construction materials by quantifying a change in effective stress due to aging of the test materials. The disclosed method is to measure the coercive force Hc and t... | 07/23/2002 |
| 6359435 | Method for determining magnetic characteristics of an electronically controlled solenoid A method is provided for determining magnetic characteristics of an electrically controlled solenoid. The method includes providing an electronically controlled solenoid having an armature, a stator and a coil operatively associated with the stator. The a... | 03/19/2002 |
| 6201386 | Method for demagnetizing and measuring remanence and coercivity characteristics of a magnetic sample A method and apparatus for determining remanence and coercivity of high strength rare earth magnets, without full determination of their hysteresis characteristics and subsequent computation, enables high speed, high throughput testing of such magnets in ... | 03/13/2001 |
| 6100685 | High frequency measuring system for magnetic properties of materials A high frequency magnetic properties measuring system is used for measurement of high frequency magnetic properties, for example high frequency core-loss and magnetic hysteresis curve (coercivity force, magnetic flux density, permeability) in soft magneti... | 08/08/2000 |
| 5998993 | Method and apparatus for testing magnetic head with spin-valve magnetoresistive element A method of testing a magnetic head with a spin-valve MR element which includes at least a pinned layer, a free layer and a non-magnetic layer for magnetically separating the pinned layer and the free layer. The method includes a step of measuring an outp... | 12/07/1999 |
| 5917321 | Process and device for determining the magnetic characteristics of thin magnetic layers A process is presented for the direct determination of characteristic magnetic values of thin magnetizable layers, in which an element creating a magnetic field creates the magnetization of a part surface in such a way that the thin magnetizable layer, th... | 06/29/1999 |
| 5750963 | Apparatus for controlling the heating of foodstuffs The invention is an apparatus for controlling an electrical heating element to control a cooking temperature of a cooking pot and contents therein. The invention includes a source of electrical current; a control for controlling application of electrical ... | 05/12/1998 |
| 5532590 | Apparatus for measuring circuit parameters wherein errors due to transmission lines are prevented A measuring circuit obtains desired characteristic values of a device under test by accurately measuring a voltage and a current. Errors are eliminated that originate from the transmission characteristics of cables used in measurements at high frequencies... | 07/02/1996 |
| 5414356 | Fluxmeter including squid and pickup coil with flux guiding core and method for sensing degree of deterioration of an object A fluxmeter includes an application unit for applying a magnetic field, a superconducting quantum interference element and a flux transmitting circuit. The flux transmitting circuit includes a pickup coil formed of a superconducting print coil and a core ... | 05/09/1995 |
| 5394083 | Magnetic imaging system for display of local variations of magnetic properties in magnetic material A multiparameter magnetic imaging system and method to be used in the localized measurement of the magnetic properties of a material and the display of those properties in the form of a false color image indicating the occurrence of those properties acros... | 02/28/1995 |
| 5241269 | Apparatus and method for measuring hysteresis characteristics in a high frequency range Apparatus for measuring a hysteresis characteristic of magnetic material, dielectric material or the like in a high frequency range without using a high-speed A/D converter. A current having a predetermined frequency is applied to an object being examined... | 08/31/1993 |
| 5142227 | Method and apparatus for measuring strain within a ferromagnetic material by sensing change in coercive field Strain within a substrate is measured by attaching thereto a magnetic circuit comprising a magnetostrictive, soft ferromagnetic element, and sensing a change in the coercive field of the element caused by strain therewith.... | 08/25/1992 |
| 5136239 | Apparatus for measuring flux and other hysteretic properties in thin film recording discs Apparatus for measuring hysteretic properties of thin film recording disks is provided which comprises a magnetic field generator for magnetizing a spot on a piece of magnetic material to be tested. The magnetized spot is moved past a stationary Hall effe... | 08/04/1992 |
| 5059903 | Method and apparatus utilizing a magnetic field for detecting degradation of metal material On the basis of a finding that a magnetic hysteresis of a metal material, among magnetization characteristics changing with secular degradation of the metal material, shows a clear correspondence with the degree of degradation of the metal material, a cha... | 10/22/1991 |
| 5028869 | Process and apparatus for the nondestructive measuring of magnetic properties of a test body, by detecting a tangential magnetic field and deriving harmonic components thereof In a process and an apparatus for determining the coercive field strength and the maximum pitch of the hysteresis cure in set-up techniques a test body is magnetized in a magnetic field of an exciter coil fed with an alternating current, as the hysteresis... | 07/02/1991 |
| 5008621 | Multiparameter magnetic inspection system with magnetic field control and plural magnetic transducers A multiparameter magnetic inspection system for providing an efficient and economical way to derive a plurality of independent measurements regarding magnetic properties of the magnetic material under investigation. The plurality of transducers for a plur... | 04/16/1991 |
| 4987367 | Method and apparatus for predicting deterioration of a member constituting a part of equipment Measurement of a physical property such as coercive force of a member to be inspected is performed at a plurality of locations in one region of the member. Similar measurement is performed in a plurality of different regions of the member and a maximum or... | 01/22/1991 |
| 4931729 | Method and apparatus for measuring strain or fatigue A magnetic domain strain gage and method of digitally measuring strain or fatigue within a ferromagnetic material by measuring the time required for an increasing magnetizing force to cause magnetic domains to flip orientation in a ferromagnetic material ... | 06/05/1990 |
| 4922200 | Apparatus for measuring the hysteresis loop of magnetic film A magneto-optic Kerr effect hysteresis loop measuring apparatus is provided which employs a pair of pole-pieces of the same magnetic polarity providing a high and uniform magnetic field strength in the gap between the oppositely disposed faces of the pole... | 05/01/1990 |
| 4843316 | Nondestructive M-H hysteresis testers for magnetic discs for computer disc drives The manufacture of digital magnetic recording discs for computer disc drives requires the monitoring and control of the M-H hysteresis loop properties of the magnetic film deposited on the disc substrate. Several methods exist for measuring this M-H hyste... | 06/27/1989 |
| 4625166 | Method for measuring magnetic potentials using hall probes The present invention concerns devices with probes for measuring magnetic potentials. Potential differences between two points of a material in a magnetic field are measured with a plurality of Hall probes arranged on a curved line which connects the poin... | 11/25/1986 |
| 4623841 | Method and apparatus for measuring magnetic properties of magnetic materials using positive and negative magnetic saturation of the materials A piece of the magnetic material to be tested is coupled to the device by primary and secondary windings. The material is then exposed to varying polarities of a controlled electrical current, such as a ramped current, through the primary winding causing ... | 11/18/1986 |
| 4463313 | Field coil for use with potential coil for measuring inner field intensity of magnetic material Process and apparatus for measuring the hysteresis curves of magnetic materials when using a field coil and a potential coil of a size such that the ends of the latter coil project through the winding of the field coil. The process consists of integrating... | 07/31/1984 |
| 4456875 | Demagnetization circuit for current transformers The invention relates to a method and a system for measuring residual flux in current transformers. The system comprises a controlled circuit for generating two voltage levels for switching the current flow in the transformer. The switching circuit is con... | 06/26/1984 |
| 4449095 | Process and apparatus for recording hysteresis curves of magnetic materials A process for measuring the hysteresis curve of magnetic materials comprises the generation of a magnetic field of varying amplitude, placing the sample to be measured into that field with a measuring coil and a potential coil attached thereto, integratin... | 05/15/1984 |
| 4368429 | Method and apparatus for suppressing noise during nondestructive eddy current testing A filter apparatus (2) is disclosed for filtering out any reoccurring noise (5) present in a defect signal (1) received from a flaw detection device (4) such as an eddy current test probe. Filter circuit means (10) receives the defect signal generated by ... | 01/11/1983 |
| 4044302 | Test set for measuring magnetic properties of magnetic amplifier cores by sinusoidal current excitation A test set for measuring magnetic properties of magnetic amplifier cores wherein a repetitive constant current sinusoidal drive signal for producing a magnetic field in the core is repeated at a low duty cycle rate of not more than one full sine wave in o... | 08/23/1977 |
| 3976935 | Apparatus for measuring the internal field intensity of magnet bodies Apparatus for measuring the internal field intensity H of a magnetic body having opposite poles surfaces includes an elongated magnetic potential measuring coil, one end of which is placed in contact with one of the pole surfaces of the body being measure... | 08/24/1976 |
