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49results about "Antiferromagnetic materials" patented technology

Rare earth magnet and manufacturing method thereof

A structure of a magnet wherein a magnet consisting of a magnetic body including iron and rare earths, a plurality of fluorine compound layers or oxyfluorine compound layers are formed interior of the magnetic body, and the fluorine compound layer or oxyfluorine compound layer has a major axis which is greater than the mean particle size of the crystal grains of the magnetic body.
Owner:HITACHI LTD

Method of making active magnetic refrigerant materials based on Gd-Si-Ge alloys

An alloy made of heat treated material represented by Gd5(SixGe1−x)4 where 0.47≦x≦0.56 that exhibits a magnetic entropy change (−ΔSm) of at least 16 J / kg K, a magnetostriction of at least 2000 parts per million, and a magnetoresistance of at least 5 percent at a temperature of about 300K and below, and method of heat treating the material between 800 to 1600 degrees C. for a time to this end.
Owner:IOWA STATE UNIV RES FOUND

Manganese oxide material having MnO3 as a matrix

A manganese oxide material has MnO3 as a matrix. It is an antiferromagnetic insulator and, when subjected to an electrical current or electric field, it is transformed into a ferromagnetic metal.
Owner:NEW ENERGY & IND TECH DEV ORG 25 +2

Ferromagnetic shape memory alloy and its use

InactiveUS20100156579A1Good shape memory propertiesMagnetsInorganic material magnetismShape-memory alloyAlloy
A ferromagnetic shape memory alloy comprising 25-50 atomic % of Mn, 5-18 atomic % in total of at least one metal selected from the group consisting of In, Sn and Sb, and 0.1-15 atomic % of Co and / or Fe, the balance being Ni and inevitable impurities, which has excellent shape memory characteristics in a practical temperature range, thereby recovering its shape by a magnetic change caused by a magnetic-field-induced reverse transformation in a practical temperature range.
Owner:JAPAN SCI & TECH CORP

Single substrate annealing of magnetoresistive structure

A device for magnetically annealing magnetoresistive elements formed on wafers includes a heated chuck and a delivery mechanism for individually placing the wafers individually on the chuck one at a time. A coil is adjacent to the chuck and generates a magnetic field after the wafer is heated to a Néel temperature of an anti-ferromagnetic layer. A control system regulates the temperature of the heated chuck, the strength of the magnetic field, and a time period during which each chuck is heated to control the annealing process. The annealed elements are incorporated in the fabrication of magnetic memory devices.
Owner:MICRON TECH INC

Magnetic sensor and current sensor

A magnetic sensor includes a magnetoresistive effect element having a sensitivity axis in a specific direction. The magnetoresistive effect element has on a substrate, a laminate structure in which a fixed magnetic layer and a free magnetic layer are laminated with a nonmagnetic material layer interposed therebetween and includes at a side of the free magnetic layer apart from the nonmagnetic material layer, a first antiferromagnetic layer which generates an exchange coupling bias with the free magnetic layer and aligns a magnetization direction thereof in a predetermined direction in a magnetization changeable state. The free magnetic layer includes a first ferromagnetic layer in contact with the first antiferromagnetic layer to be exchange-coupled therewith and a magnetic adjustment layer at a side of the first ferromagnetic layer apart from the first antiferromagnetic layer. The magnetic adjustment layer contains at least one iron group element and at least one platinum group element.
Owner:ALPS ALPINE CO LTD

Characterization method of magnetic change of antiferromagnetic material under stress action, characterization device and preparation method thereof

The invention provides a characterization method of a magnetic change of an antiferromagnetic material under the stress action. The characterization method specifically comprises the following steps:arranging a ferromagnetic material on the surface of the antiferromagnetic material, and coupling the ferromagnetic material with the antiferromagnetic material; and providing stress for the antiferromagnetic material, wherein the magnetic property of the antiferromagnetic material change under the stress action, and the magnetic property of the ferromagnetic material also change due to the coupling action, so that the magnetic change of the antiferromagnetic material under the stress action is inducted by measuring the change of the magnetic property of the ferromagnetic material. The characterization method can be used to obtain a magnetic property change rule of the antiferromagnetic material under the stress action, and the magnetic property regulation of the antiferromagnetic materialcan be realized by regulating the stress accordingly. The invention also provides a characterization device which is of a multilayer film structure in turn comprising a substrate layer, an antiferromagnetic material layer, a ferromagnetic material layer and a protective layer, and the characterization device has the advantages of simple structure and convenience in characterization.
Owner:NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI

Optical sensor

An optical sensor is disclosed. The optical sensor may include a substrate, a topological insulator layer formed on the substrate, an oxide layer formed on the topological insulator layer, a graphene layer stacked on the oxide layer, and a dielectric layer covering the graphene layer.
Owner:SAMSUNG ELECTRONICS CO LTD +1

Magnetoelectric chromia having increased critical temperature

A magnetoelectric composition of boron and chromia is provided. The boron and chromia alloy can contain boron doping of 1%-10% in place of the oxygen in the chromia. The boron-doped chromia exhibits an increased critical temperature while maintaining magnetoelectric characteristics. The composition can be fabricated by depositing chromia in the presence of borane. The boron substitutes oxygen in the chromia, enhancing the exchange energy and thereby increasing Neel temperature.
Owner:BOARD OF RGT UNIV OF NEBRASKA

Motor using magnet

A permanent magnet comprises a hard magnetic material that contains at least a rare earth element and an anti-ferromagnetic material, wherein the hard magnetic material and the anti-ferromagnetic material are magnetically coupled. A volume ratio of the anti-ferromagnetic material is 20% or less, based on the permanent magnet.
Owner:HITACHI LTD

Antiferromagnetic half-metallic semiconductor and manufacturing method therefor

An antiferromagnetic half-metallic semiconductor of the present invention is manufactured by adding to a semiconductor two or more types of magnetic elements including a magnetic element with a d-electron number of less than five and a magnetic element with a d-electron number of more than five, and substituting a part of elements of the semiconductor with the two or more types of magnetic elements.
Owner:OSAKA UNIV

Magnetic semiconductor material

A magnetic semiconductor material contains at least one type of transition metals (Mn2+, Fe3+, Ru3+, Re2+, and Os3+) having five electrons in the d atomic orbital as a magnetic ion, in which the magnetic semiconductor material exhibits n-type electrical conduction by injection of an electron carrier and p-type electric conduction by injection of a hole carrier. A specific example is a layered oxy-pnictide compound represented by LnMnOPn (wherein Ln is at least one type selected from Y and rare earth elements of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, and Pn is at least one selected from pnicogen elements of N, P, As, Bi, and Sb). A high-sensitivity magnetic sensor, current sensor, or memory device can be made by using a magnetic pn homojunction structure made of thin films composed of the magnetic semiconductor material.
Owner:JAPAN SCI & TECH CORP

Oxidatively stable magnetic metal nanoparticles prepared with copolymers containing phthalonitrile moieties, and polymer-metal complexes and their conversion to oxidatively-stable metal nanoparticles

InactiveUS20050196454A1Degradation of magnetic propertyPowder deliveryTransportation and packagingPolymer metalPolystyrene
Oxidatively-stable, magnetic cobalt nanoparticles and other Group VIII nanoparticles are provided, and production methods. Poly(styrene-b-4-vinylphenoxyphthalonitrile) (a novel composition) or random graft copolymers containing phthalonitrile groups in the backbone are examples of compositions that may be complexed with cobalt or other Group VIII metals.
Owner:VIRGINIA TECH INTPROP INC

Binuclear metal organic complex based on nickel (II) and preparation method thereof

The invention relates to a binuclear metal organic complex based on nickel (II), the binuclear metal organic complex is a nickel metal organic complex with a repeating unit of [Ni2 (fdc) 2 (bipy) 2 (H2O)4].(H2O) 2, fdc in the [Ni2 (fdc) 2 (bipy) 2 (H2O)4].(H2O) 2 is furan-2, 5-dicarboxylic acid, and dmbpy is 3, 3 '-dimethyl-4, 4 '-dipyridine; the binuclear metal organic complex based on nickel (II) has good antiferromagnetism.
Owner:ZHAOQING UNIV

Transparent ferromagnetic compound containing no magnetic impurity such as transition metal or rare earth metal and forming solid solution with element having imperfect shell, and method for adjusting ferromagnetic characteristics thereof

A single-crystal transparent ferromagnetic compound that transmits light and has significant ferromagnetic properties is selected from the group consisting of alkaline earth chalcogenides, alkali chalcogenides, I-VII compounds, II-VI compounds, III-V compounds, IV-VI2 compounds, IV-IV compounds, and II-VII2 compounds. At least one element having an incomplete outermost p-electron shell, such as B, C, N, O, F, Si, or Ge, is dissolved in the compound so that the compound has a ferromagnetic transition temperature of room temperature or higher. The ferromagnetic properties of the compound are controlled by adjustment of the concentration of the element having an incomplete outermost p-electron shell and valence electron control through, for example, the addition of an acceptor and a donor.
Owner:JAPAN SCI & TECH CORP

Motor using magnet

A permanent magnet comprises a hard magnetic material that contains at least a rare earth element and an anti-ferromagnetic material, wherein the hard magnetic material and the anti-ferromagnetic material are magnetically coupled. A volume ratio of the anti-ferromagnetic material is 20% or less, based on the permanent magnet.
Owner:HITACHI LTD

Coordination balance cationic salt, and magnet formed by metal dithiolene complex and preparation methods thereof

The invention belongs to the field of functional materials, and particularly relates to a coordination balance cationic salt, and a magnet formed by a metal dithiolene complex and preparation methods thereof. The coordination balance cationic salt reacts with coordination anions to obtain the metal dithiolene complex; on one hand, the 4-iodobenzyl and 4-phenylpyridin in the coordination balance cation are respectively of a plane structure, the plane structures respectively have a symmetric axis, and are crossed at the connected carbon atom of 4-iodobenzyl and 4-phenylpyridin, and the whole inverted Y-shaped structure is formed; on the other hand, the coordination anion is of a plane structure, and the self-rotation density of the unpaired electrons is distributed on the whole anion skeleton. By adopting the structure, the magnet formed by the coordination balance cations and coordination anions is of an equal-spacing arrangement structure, the cations and anions are stacked into columns by lines, and the electron transmission and self-rotation coupling of the metal dithiolene complex are favorably performed. The magnet formed by the metal dithiolene complex has the advantages that the technology is simple, the control is easy, the reaction speed is quick, and the product purity is high.
Owner:NANJING XIAOZHUANG UNIV

Motor using magnet

A permanent magnet comprises a hard magnetic material that contains at least a rare earth element and an anti-ferromagnetic material, wherein the hard magnetic material and the anti-ferromagnetic material are magnetically coupled. A volume ratio of the anti-ferromagnetic material is 20% or less, based on the permanent magnet.
Owner:HITACHI LTD

[Co2(dba)(bpe)(OH)](H2O)] antiferromagnetic complex and preparation method thereof

The invention discloses a [Co2(dba)(bpe)(OH)](H2O)] antiferromagnetic complex and a preparation method thereof. The antiferromagnetic complex is composed of 2-(3',4'-dicarboxylphenyl)benzoic acid (H3dba), bipyridyl ethylene (bpe) and cobalt, has a three-dimensional compact structure and has P21 / n space groups, wherein crystallographic parameters a = 10.8399(10) angstrom, b = 14.3010(13) angstrom,c = 17.0860(15) angstrom, alpha = 90 degrees, beta = 91.10 degrees, gamma = 90 degrees, and V = 2648.2 angstrom<3>. The complex has excellent antiferromagnetic property. The invention also discloses apreparation method of the complex by performing a hydrothermal reaction to cobalt salt, H3dba and bpe in a polytetrafluoroethylene reaction liner and filtering, washing and drying a product. The method employs economic and practical raw materials, is high in yield, has simple operation process and gentle conditions, is easy to control and is green and environment-friendly.
Owner:SHAANXI UNIV OF SCI & TECH

Preparation method of magnetic cluster colloid and magnetic cluster colloid prepared thereby

This invention relates to a manufacturing method of colloid comprising magnetic nanoclusters and magnetic nanocluster colloid made by the same. More particularly, this invention relates to a manufacturing method of colloid comprising magnetic nanoclusters comprising magnetic precursor and heterometal precursor by a certain ratio and magnetic nanocluster colloid made by the same.
Owner:SEOUL NAT UNIV R&DB FOUND +1

Ferromagnetic IV group based semiconductor, ferromagnetic III-V group based compound semiconductor, or ferromagnetic II-VI group based compound semiconductor, and method for adjusting their ferromagne

Disclosed is a ferromagnetic group IV-based semiconductor or a ferromagnetic group III-V-based or group II-VI-based compound semiconductor, comprising a group IV-based semiconductor or a group III-V-based or group II-VI-based compound semiconductor, which contains at least one rare-earth metal element selected from the group consisting of Ce, Pr, Nd, Pm, Sm, Eu, Gd, Th, Dy, Ho, Er, Tm, Yb and Lu. The ferromagnetic characteristic of the ferromagnetic semiconductor is controlled by adjusting the concentration of the rare-earth metal element, combining two or more of the rare-earth metal elements or adding a p-type or n-type dopant.
Owner:JAPAN SCI & TECH CORP

Transparent ferromagnetic alkali/chalcogenide compound comprising solid solution of transition metal or rare earth metal and method of regulating ferromagnetism thereof

Disclosed is a ferromagnetic alkali chalcogen compound capable of providing a completely-spin-polarized transparent ferromagnetic material using an alkali chalcogen compound having light-transparency, and a method of adjusting ferromagnetic properties thereof. The transparent ferromagnetic alkali chalcogenide comprises an alkali chalcogen compound which has an anti-fluorite structure and contains at least one metal element selected from a 3d transition metal element group consisting of Ti, V, Cr, Mn, Fe, Co, Ni and Cu; a 4d transition metal element group consisting of Zr, Nb, Mo, Tc, Ru and Rh; a 5d transition metal element group consisting of Hf, Ta, W, Os, Re and Ir; and a lanthanum-series rare-earth element group consisting of Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu. The selected metal element is incorporated in the alkali chalcogen compound in the form of a solid solution to provide a ferromagnetic characteristic thereto. The ferromagnetic properties are adjusted through control of valence states based, for example, on adjustment of a concentration of each of the metal elements, selection of a combination of two or more of the metal elements, and / or addition of an acceptor and a donor.
Owner:JAPAN SCI & TECH CORP

Method For Obtaining A Material With Giant Magnetocaloric Effect By Ion Irradiation

The present invention concerns, in particular, a method for obtaining a product with magnetocaloric effect from a single piece of material having a magnetic phase transition, the method comprising irradiation of at least one part of the material with ions, the irradiation being carried out with a suitable flux so that, after the irradiation, the material has various magnetic phase transition temperatures in the various parts of the material.
Owner:CENT NAT DE LA RECHERCHE SCI +1

Method for regulating and controlling magnetic moment arrangement of antiferromagnetic film material

The invention discloses a method for regulating and controlling magnetic moment arrangement of an antiferromagnetic film material, which belongs to the technical field of information storage and sensing. The method comprises the following steps: pre-stretching treatment, surface polishing and surface argon ion bombardment treatment are carried out on an titanium-nickel-niobium TiNiNb shape memoryalloy substrate; then, a tantalum Ta / ferronickel NiFe / ferro-manganese FeMn / tantalum Ta multilayer film is deposited on the TiNiNb memory alloy substrate; and after the deposition is finished, heat treatment is carried out in a vacuum environment and simultaneously a magnetic field is applied, and finally cooling is carried out to room temperature. The principle is as follows: a remarkable latticestrain is generated through inverse martensite phase transformation of the temperature control TiNiNb substrate and acts on the multilayer film, and an exchange spring structure at a NiFe / FeMn interface can be controlled through the strain, so that the Neel vector rotation of FeMn is caused, and the magnetic moment arrangement of FeMn is effectively regulated and controlled. According to the invention, the structure of an exchange spring can be adjusted through simple temperature control, so that effective regulation and control of FeMn magnetic moment arrangement are realized, and the methodhas the advantages of simple preparation, convenient control, low energy consumption, high efficiency, low cost and the like.
Owner:UNIV OF SCI & TECH BEIJING
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