31 results about "Amorphous magnetic material" patented technology

This invention aims to provide a communication device, installation structure for the communication device, a method of manufacturing the communication device, and a method of communication with the communication device in which the communication device is able to exceedingly restain a conductive material from attenuating magnetic flux and to expand communication distance even when the communication device is attached to a conductive member e.g., metal, in a closely contacting manner.This invention has a sheet-like amorphous magnetic material being arranged in a manner extending from a magnetic flux generating portion of a concentric disk-shaped antenna coil of an RFID tag serving as the communication device to an outer area of the antenna coil.

An electric rotating machine having permanent magnets comprising a rotor having a plurality of permanent magnets, a stator iron core disposed in opposite relation with the rotor, and a stator winding wound around the stator core, wherein the stator core is constituted by a yoke and a plurality of teeth portions disposed to the yoke. The teeth portions are projected towards the inner periphery of the rotor. The teeth portions is made of amorphous magnetic material.

In a spin tunnel magnetoresistive effect film in which a magnetic thin film to which an exchange bias is applied by exchange coupling via an anti-ferromagnetic thin film and a magnetic thin film that detects a magnetic field are laminated, a magnetic thin film or an anti-ferromagnetic thin film (PtMn, PdMn, NiMn) is laminated onto an underlayer (Ta, Zr, Hf), the surface roughness thereof being in the range from 0.1 to 5 Angstroms. A means used to control the surface roughness introduces into the film growing chamber oxygen, nitrogen, hydrogen, or a gas mixture thereof into a vacuum of 10−6 Torr to 10−9 Torr, reduces the substrate temperature to 0° C. or lower during film growth, or oxidizes an underlayer. The lower electrode layer material used is a film laminate of a high-permeability amorphous magnetic material and a non-magnetic metallic layer.

In a method of diagnosing the fatigue life of structural steelwork according to the present invention, a Barkhausen noise measurement is performed under the condition of 5 mu m< / =d< / =1 mm where d is the detection depth of Barkhausen noise, by using a magnetic head constituted by an air-core coil detection head and a magnetic excitation head obtained by winding a copper wire such as an enameled wire on a U-shaped core made of a soft magnetic material such as a silicon steel sheet or an amorphous magnetic material. The degree of fatigue damage of a target measurement portion is diagnosed using the root-mean-square (RMS) voltage or voltage amplitude value of the Barkhausen noise. According to this method, the degree of fatigue and degradation by stress and strain in the structural steelwork can be accurately diagnosed prior to development of cracking without any limitation on diagnostic locations. A member of steelwork having a life diagnostic function is obtained by mounting the above magnetic head on a brace- or wall-like vibration-damping device made of very low-yield steel. According to this member of steelwork, the wall or covering material of a bridge or the like need not be removed even in practicing a fatigue life diagnosis. The degree of fatigue degradation in structural steelwork can be easily and accurately diagnosed prior to development of cracking even in a location where an operator cannot access due to the structural limitation.

The present invention relates to a method for producing in large numbers a multiplicity of magnetic sensors produced on a semiconductor substrate, these sensors comprising at least one magnetic core produced in an amorphous magnetic material, characterised in that, after integration of the electronic circuits associated with the magnetic sensors, a film of amorphous magnetic material is glued onto the semiconductor substrate, this film being obtained from a band of amorphous magnetic material cut into a plurality of sections which are disposed one beside the other on a support, said film being then structured in order to form the magnetic cores of said magnetic sensors, the semiconductor substrate being finally cut up in order to provide a plurality of individual magnetic sensors.

A powder core includes: a powder of a crystalline magnetic material; and a powder of an amorphous magnetic material, in which a median diameter D50A of the powder of the amorphous magnetic material is 15 μm or less, and satisfies the expression: 1≦D50A / D50C≦3.5 with respect to a median diameter D50C of the powder of the crystalline magnetic material.

The present invention is intended to provide a magnet apparatus obviating the necessity of shield coils designed to suppress eddy currents. The magnet apparatus has gradient coils disposed in a bore of a cylindrical superconducting magnet, and includes a cylindrical structure that is realized with a combination of tiles made of a high-permeability material and that is interposed between the internal surface of the superconducting magnet and the external surface of the gradient coils. The tiles made of a high-permeability material are laminates made of a high-permeability material. The high-permeability material is a silicon steel plate or an amorphous magnetic material.

An underlying layer is composed of Co—Fe—B that is an amorphous magnetic material. Thus, the upper surface of the underlying layer can be taken as a lower shield layer-side reference position for obtaining a gap length (GL) between upper and lower shields, resulting in a narrower gap than before. In addition, since the underlying layer has an amorphous structure, the underlying layer does not adversely affect the crystalline orientation of individual layers to be formed thereon, and the surface of the underlying layer has good planarizability. Accordingly, PW50 (half-amplitude pulse width) and SN ratio can be improved more than before without causing a decrease in rate of change in resistance (Δ R / R) or the like, thereby achieving a structure suitable for increasing recording density.

A dust core contains a powder of a crystalline magnetic material powder and a powder of an amorphous magnetic material. The sum of the content of the crystalline magnetic material powder and the content of the amorphous magnetic material powder is 83 mass percent or more. The mass ratio of the content of the crystalline magnetic material powder to the sum of the content of the crystalline magnetic material powder and the content of the amorphous magnetic material powder is 20 mass percent or less. The median diameter D50 of the amorphous magnetic material powder is greater than or equal to the median diameter D50 of the crystalline magnetic material powder.

The invention discloses a heat conducting oil circular cooling system made of for amorphous magnetic materials, comprising a heat conducting oil cooling roller, a cooling roller rotating shaft and a heat conducting oil cooling tank, wherein the two ends of the axis of the cooling roller rotating shaft are coaxially connected with a heat conducting oil input pipe and a heat conducting oil output pipe, the heat conducting oil cooling roller is provided with a heat conducting oil cooling passage for enabling the heat conducting oil input pipe and the heat conducting oil output pipe to communicatewith each other, the heat conducting oil input pipe and the heat conducting oil output pipe are connected with the heat conducting oil cooling tank, a liquid nitrogen cooling pipe is arranged in theheat conducting oil cooling tank, one end of the liquid nitrogen cooling pipe is connected with a liquid nitrogen input pipe located outside the heat conducting oil cooling tank, and the other end ofthe liquid nitrogen cooling pipe is connected with a liquid nitrogen output pipe located outside the heat conducting oil cooling tank. The heat conducting oil circular cooling system made of amorphousmagnetic material further improves the cooling efficiency of the cooling roller to improve the production efficiency of amorphous alloy magnetic strips.

A tape format magnetoelastic resonator device comprises a continuous ribbon of amorphous magnetic material having a plurality of separate, hinged magnetoelastic resonator strips formed from the ribbon, linearly displaced along a longitudinal axis of the ribbon, wherein each magnetoelastic resonator strip is configured to couple to an external magnetic field at a particular frequency and convert the magnetic energy into mechanical energy, in the form of oscillations.

The invention provides an amorphous magnetic shielding board for a transformer and a processing method thereof. The processing method comprises the following steps of: cutting an amorphous strip into amorphous magnetic boards in a needed size; then, sequentially overlapping several amorphous magnetic boards in a positive and negative opposition mode into an amorphous overlapping sheet and fixing the amorphous overlapping sheet with a clamp; and after annealing and curing the amorphous overlapping sheet in vacuum, coating the periphery of the amorphous overlapping sheet with an insulated paper board to form an amorphous magnetic shielding board. The amorphous magnetic shielding board made of amorphous magnetic material has the advantages of favorable magnetism-conducting performance, small size and light weight, can effectively reduce the vortex loss and the circuit loss of a transformer and can save energy approximate 25 percent.

To provide a dust core containing a powder of crystalline magnetic material and a powder of amorphous magnetic material, and an inductor including such a dust core, where DC superposition characteristics are improved while reducing iron loss. In a dust core 1 containing a powder of crystalline magnetic material and a powder of amorphous magnetic material, the median size DA of the powder of amorphous magnetic material is 15 [mu]m or less, and the ratio to the median size D50C of the powder of crystalline magnetic material satisfies the following formula (1); 1<=D50A / D50C<=3.5 (1).

A composite recording structure comprising a first magnetic free layer comprising an amorphous magnetic material sub-layer, a Boron-absorbing material sub-layer atop the amorphous magnetic material sub-layer and a Co / Ni superlattice sub-layer atop the Boron-absorbing material sub-layer; one or many repeats of a substructure including a nonmagnetic spacing layer and a Co / Ni superlattice free layer, atop the first magnetic free layer, wherein said first magnetic free layer has a perpendicular magnetic anisotropy and a variable magnetization direction substantially perpendicular to a film surface, said each Co / Ni superlattice free layer has a perpendicular magnetic anisotropy and a variable magnetization direction substantially perpendicular to a film surface.

A magnetic recording medium includes: an underlayer constituted of at least a substrate and a nonmagnetic metal element; and an amorphous magnetic layer, made of amorphous magnetic material, which magnetically records information. In certain example embodiments, the amorphous magnetic layer has bumps on a surface thereof or the magnetic recording medium has bumps on a surface thereof (surface of a lubricating layer) so that density of the bumps is not less than 400 bumps / μm2 or so that height of the bumps is not less than 2% with respect to an average layer thickness of the amorphous magnetic layer. Thus, magnetic wall movement of the amorphous magnetic layer is effectively suppressed, so that it is possible to stably form a recording bit.

Provided is a powder magnetic core containing powder of a crystalline magnetic material and a powder of an amorphous magnetic material. In an inductor including the powder magnetic core, DC superposition characteristics can be improved and iron loss can be reduced. A powder magnetic core (1) comprising a powder of a crystalline magnetic material and a powder of an amorphous magnetic material, wherein the powder of the amorphous magnetic material has a median diameter D50A of 15 μm or less and is compatible with a crystalline magnetic material The median diameter D50C of the powder of the material satisfies the following formula (1), 1≤D50A / D50C≤3.5(1).

The invention relates to a new process for producing an amorphous state strip under non-vacuum. The new process is characterized by being performed according to the following steps that firstly, high-purity pure iron molten steel is produced, the high-purity pure iron molten steel is prepared by adopting ZL201410341008. 4, with the name of high-purity pure iron molten steel produced by a method for producing high-purity pure iron; secondly, Si, B and P alloys are matched into the high-purity pure iron molten steel to form amorphous magnetic material molten steel which flows onto a cooling copper roller rotating at a high speed through a nozzle wrapping seam of a spray nozzle of a crucible, and the molten steel is cooled into a thin strip suddenly and violently. According to the new process, an ultra-short flow path system composed of a coal-based vertical furnace and an intermediate frequency smelting system is utilized for producing low-impurity pure iron with iron larger than 99.9% to serve as a high-quality base material of an amorphous nanocrystalline soft magnetic material, and effective self control and improvement of the product quality are achieved. The new process is shorter than a traditional amorphous state strip technological process, little in tool equipment, saving in investment, low in energy consumption, low in cost and capable of performing self control on theproduct quality.

The invention relates to the field of amorphous magnetic materials, in particular to a packaging method of an iron-based amorphous alloy strip. The iron-based amorphous alloy strip is subjected to oilremoval and cleaning and put into a CaSO4 water solution with the concentration being 0.02 to 0.03 mol / L, and the solution is heated to 25 to 85 DEG C and subjected to heat preservation for 30 min to5 hour; the strip is taken out and dried; and finally, the strip is immersed into epoxy resin and taken out, and the packaged iron-based amorphous alloy strip is obtained. The packaging method is simple, convenient, low in packaging preparing temperature, short in reaction time, and high in interface combination force, epoxy resin is evenly bonded on the strip surface, and the resin and alloy strip surface wettability is good.

The invention relates to the technical field of high-frequency transformers, and particularly relates to an amorphous magnetic material high-frequency transformer iron core and a manufacturing method thereof. The amorphous magnetic material high-frequency transformer iron core comprises a plurality of same amorphous magnetic material sheets, the amorphous magnetic material sheets are stacked into an amorphous magnetic material block, and the contact surfaces of every two adjacent amorphous magnetic material sheets are coated with a thermosetting resin composition. The manufacturing process comprises the working procedures of strip shearing, iron core forming, heating curing, cutting, grinding, forming and the like, on one hand, the amorphous magnetic material high-frequency transformer iron core can improve the working magnetic flux density applied to a high-frequency transformer of 10 kHz to 200 kHz, the power density of the high-frequency transformer is remarkably improved, and equipment miniaturization is facilitated; and on the other hand, the amorphous material has better toughness than ferrite and is not easy to damage in the transportation and use processes so that the reliability of equipment is improved.

The invention relates to a nanocrystalline and synthetic graphite non-adhesive composite material and a preparation method thereof. The method comprises the steps of: a nanocrystalline raw material isheated to a molten state in a vacuum environment; the nanocrystalline material is sprayed in the molten state into the surface of the synthetic graphite conveyed through a roller shaft by the operation of the melt-spinning, and the composite graphite passes through a cooling zone to form a composite of an amorphous magnetic material and synthetic graphite; the composite of the amorphous magneticmaterial and the synthetic graphite is annealed at 500 to 600 DEG C to crystallize the amorphous portion of the composite; the composite is naturally cooled and fed into a press for stitching, and thecomposite material in which nanocrystals and synthetic graphite are combined can be obtained. The nanocrystalline and synthetic graphite non-adhesive composite material has high magnetic permeability, small magnetic loss at high frequency, and has high thermal conductivity.

The invention concerns a method for mass production of a plurality of magnetic sensors (1) produced on a semiconductor substrate (4), said sensors (1) comprising at least a magnetic core (8) made of an amorphous magnetic material. The invention is characterised in that, after integrating electronic circuits associated with the magnetic sensors (1), an amorphous magnetic material film (22) is bonded on the semiconductor substrate (4), said film being obtained from an amorphous magnetic material strip cut out into several sections (18) which are arranged juxtaposed on a support (20), said film being then structured to form the magnetic cores (8) of said magnetic sensors (1), the semiconductor substrate (4) being finally cut out to provide a plurality of individual magnetic sensors (1).