139results about "Nanomagnetism" patented technology

A semiconductor process integrates three bridge circuits, each include magnetoresistive sensors coupled as a Wheatstone bridge on a single chip to sense a magnetic field in three orthogonal directions. The process includes various deposition and etch steps forming the magnetoresistive sensors and a plurality of flux guides on one of the three bridge circuits for transferring a "Z" axis magnetic field onto sensors orientated in the XY plane.

A computing element is provided. The computing element includes a) an artificial lattice comprising a multiplicity of connecting elements separated by pores; b) a plurality of input channels attached to the artificial lattice each configured to provide at least one of an electrical current and voltage to the artificial lattice; c) a plurality of readout channels attached to the artificial lattice, wherein each readout channel of the plurality of readout channels is connected to a common ground; and d) one or more sensing elements positioned at least one of perpendicular and along to the plurality of input channels and attached to the artificial lattice, wherein the one or more sensing elements configured to read a readout to create an output.

This invention belongs to the field of tertiary oil recovery technology, specifically relating to a CO2-switched magnetically driven nanoparticle, its preparation method, and its application. The magnetically driven nanoparticles are silica-coated Fe3O4 nanoparticles. The surface of the silica coating is further modified with amidine groups to act as CO2 switches. These CO2 switches cause the hydrophilicity of the magnetically driven nanoparticles to increase with the increase of CO2 solubility in the solution in which they are located. This invention integrates emulsification and demulsification functions through the CO2 switch loaded on the surface of the magnetically driven nanoparticles. Furthermore, the particles can be recycled using their own magnetic response, reducing costs. This nano-displacement agent can solve the problems of poor efficiency, ineffective oil-water separation, high economic costs, and environmental impact associated with existing displacement agents.

A spin orbit torque (SOT) magnetic tunnel junction (MTJ) device includes a substrate, a seed layer over the substrate, and a bismuth antimony (BiSb) layer having a (0120) orientation on the seed layer. The seed layer includes a silicide layer and a surface control layer. The silicide layer includes a material of NiSi, NiFeSi, NiFeTaSi, NiCuSi, CoSi, CoFeSi, CoFeTaSi, CoCuSi, or a combination thereof. The surface control layer includes a material of NiFe, NiFeTa, NiTa, NiW, NiFeW, NiCu, NiCuM, NiFeCu, CoTa, CoFeTa, NiCoTa, Co, CoM, CoNiM, CoNi, NiSi, CoSi, NiCoSi, Cu, CuAgM, CuM, or a combination thereof, where M is Fe, Cu, Co, Ta, Ag, Ni, Mn, Cr, V, Ti, or Si.

The invention relates to high-frequency ultralow-loss iron-nickel alloy powder and a preparation method thereof.The powder comprises a powder core composed of iron-nickel alloy, the core comprises, by weight, 75.5%-77.5% of nickel, 4.5%-6.5% of molybdenum, 2%-3% of lanthanum and titanium, the mass ratio of lanthanum to titanium is 2: 1, and the balance is iron and inevitable impurities; the surface of the powder core is coated with an insulating metal oxide layer with the average thickness of 3 nm to 10 nm. The soft magnetic material prepared from the high-frequency ultralow-loss iron-nickel alloy powder has excellent high-frequency magnetic conductivity and low power loss, the high-frequency magnetic conductivity'under 50 MHz is 38-49, the power loss under 100 KHz / 100 mT is 260-281 mW / cm < 3 >, and high magnetic conductivity and power loss are still achieved under the high-frequency condition.

The invention discloses an MMP-9-targeted MRI (Magnetic Resonance Imaging) nanoprobe and a preparation method and application thereof, the MMP-9-targeted MRI nanoprobe is represented by Gd-ACC-MAP and comprises amorphous calcium carbonate and an aptamer covalently connected to the surface of the amorphous calcium carbonate, the calcium carbonate is doped with gadolinium, and the aptamer has a nucleotide sequence as shown in SEQ ID NO: 1. The MRI nanoprobe can be used for early diagnosis of aneurysm and evaluation of rupture risk of the aneurysm.

In a first aspect, the present invention is directed to a magnetic particle having a saturation magnetization ≥ 15 Am2 / kg and having at least one azide group –N=N'-N- bonded to a polymer matrix of the magnetic particle. A second aspect of the invention relates to a process for preparing a magnetic particle, which comprises at least one magnetic core (M), a polymer matrix (P) comprising a crosslinked polymer at least partially surrounding the magnetic core (M), the polymer matrix (P) comprising on its surface at least a functional group reactive towards amine groups and / or hydroxyl groups. In a third aspect, the invention is directed to the magnetic particle obtained or obtainable from the process of the second aspect. A fourth aspect is related to a process for preparing a magnetic particle having a saturation magnetization ≥ 15 Am2 / kg of the first aspect, and a fifth aspect relates to the magnetic particle obtained or obtainable from the process of the fourth aspect. A sixth aspect is directed to the use of the magnetic particle having a saturation magnetization ≥ 15 Am2 / kg of the first aspect or of the fourth aspect for qualitative and / or quantitative determination of at least one analyte in a fluid or in a gas, and a seventh aspect relates to a method for determining at least one analyte in a fluid using said magnetic particle having a saturation magnetization ≥ 15 Am2 / kg.

An anisotropic electroconductive film and an electroconductive connector that make it possible to achieve lower resistance than the prior art, improved highfrequency characteristics and higher resolution, improved contact stability due to reduced contact pressure, increased electrical current capacity, and improved durability are provided. An anisotropic electroconductive film 110 includes an electrically insulative thin film 112 made of an elastic polymer material, and particles 200 made of a substance exhibiting topological antiferromagnetic properties, which are dispersed in the electrically insulative thin film 112 and which are given magnetic anisotropy so that an easy direction of magnetization is in a thickness direction of the electrically insulative thin film 112. The particles 200 form conduction portions 114 which are arranged at intervals in an in-plane direction of the electrically insulative thin film 100 for enabling electrical conduction along the thickness direction thereof. Each conduction portion 114 is formed by the single particle 200 (or the particles 200 aligned in the thickness direction). Each particle 200 has a south pole region 604 and a north pole region 602 formed respectively at two ends thereof along the easy direction of magnetization, and the south pole region and the north pole region are subject to concentration of magnetic flux of virtual magnetic fields.

The invention provides an iron-based nano material, a preparation method and application, the material comprises magnetic iron oxide nano particles and a functional modification layer on the surface, the magnetic iron oxide nano particles are Fe3O4, the particle size is 10-30 nm, and the magnetic iron oxide nano particles have specific oxygen vacancy concentration, 337 nm laser absorptivity and saturation magnetization; the functional modification layer is an amino-containing polymer layer, such as a polydopamine or cysteine-polyethyleneimine copolymer, and can reduce salt ion interference. The material solves the problems of low molecular weight region background interference, non-uniform crystallization, low ionization efficiency, poor salt tolerance and the like during detection of 100-400Da small molecular metabolites in trace samples such as tears and the like by optimizing magnetic responsiveness, photo-thermal conversion capability and salt resistance of an existing matrix; the method realizes high sensitivity and high repeatability (detection), and is suitable for metabonomics analysis of trace biological samples.

Provided are: a nanocrystal alloy soft magnetic powder which optimizes the particle shape and particle size distribution and exhibits good filling properties and magnetic properties; a dust core which contains the powder and has high magnetic permeability and low iron loss; a magnetic element; and an electronic device. The nanocrystal alloy soft magnetic powder is represented by the composition formula FeaCubNbc (Si1-x (B1-yCry) x) 100-a-b-c-dSd [a, b, c, d, x, and y satisfy 75.5 < = a < = 79.5, 0.3 < = b < = 2.0, 2.0 < = c < = 4.0, 0.001 < = d < = 0.080, 0.55 < = x < = 0.91, and 0 < = y < = 0.185, expressed in atomic ratio. [1, 2, 3], and an impurity composition, and contains crystal grains of 1.0 nm to 30.0 nm, a particle size D10 of 7.0 [mu] m to 15.0 [mu] m, and a particle size D50 of 22.0 [mu] m to 32.0 [mu] m.

The application discloses a kind of magnetically sensitive β-CD-OTf@Au@R-Fe3O4 Nanomotor and its preparation method and application, including the following steps: respectively preparing Zn (OTf) 2 solution and supersaturated β-CD solution, based on host-guest interaction, after mixing, β-CD-OTf is obtained;R-Fe3O4 is in situ assembled on Au NPs by electrostatic force, and R-Fe3O4@Au is obtained;Au@R-Fe3O4 is coupled to β-CD-OTf by electrostatic force, and magnetically sensitive β-CD-OTf@Au@R-Fe3O4 Nanomotor is obtained.The preparation method is simple, and the obtained nanomotor can not only significantly improve selective adsorption capacity to cationic dye, but also has high SERS activity, can realize self-cleaning after SERS detection, has excellent self-cleaning performance and recycling performance, and is suitable for being applied in cyclic selective capture and high-sensitivity SERS detection of cationic dye.

To provide a method for producing a new ferrite quantum dot different from a conventional one.SOLUTION: A method for producing ferrite quantum dots, the method comprising the steps of preparing a mixed solution in which at least ferrous hydroxide is present in water at 0 °C or higher and 30 °C or lower, preparing a green rust-containing suspension by oxidizing the mixed solution to form green rust crystals in the mixed solution, synthesizing ferrite quantum dots in the suspension by raising the temperature of the suspension to 50 °C or higher and 100 °C or lower in an oxygen-free stream, and collecting the ferrite quantum dots in the suspension.SELECTED DRAWING: None

To provide a magnetoresistance effect element with a large MR ratio.SOLUTION: A magnetoresistance effect element comprises a first ferromagnetic layer, a second ferromagnetic layer, and a non-magnetic layer. The first ferromagnetic layer includes a first layer and a second layer. The first layer is arranged closer to the non-magnetic layer than the second layer. The first layer contains a heusler alloy which is at least partially crystallized. The second layer includes a ferromagnetic body which is at least partially crystallized, unlike the heusler alloy. The first layer and the second layer include a first atom added. The first atom is one selected from the group consisting of Mg, Al, Cr, Mn, Ni, Cu, Zn, Pd, Cd, In, Sn, Sb, Pt, Au, and Bi.SELECTED DRAWING: Figure 1

The invention relates to a Fe-based nanocrystalline alloy material and a preparation method and application thereof, and belongs to the technical field of nanocrystalline alloy materials. The invention provides a Fe-based nanocrystalline alloy material, the atomic percentage expression of the Fe-based nanocrystalline alloy material is FexGdyBz, x is the atomic content corresponding to the Fe element, and x is greater than or equal to 82 and less than or equal to 87; y is the atom content corresponding to the Gd element, and 0.5 < = y < = 3; z is the atom content corresponding to the element B, and z is greater than or equal to 12 and less than or equal to 16; x + y + z is equal to 100. After the Gd element is added, the coercive force of the Fe-based nanocrystalline alloy material can be further reduced, the saturation magnetization of the Fe-based nanocrystalline alloy material is improved, and the Fe-based nanocrystalline alloy material with excellent soft magnetic performance and high iron content is obtained. It is found that the contents of Fe, Gd and B elements have a certain relation, and under the specific contents, the soft magnetic performance of the Fe-based nanocrystalline alloy material can be improved.

The invention provides a FeCo hard magnetic nanowire preparation method, which comprises: mixing an iron source, a cobalt source, a reducing agent and a solvent, heating to a temperature of 70-75 DEG C in an argon atmosphere, carrying out ultrasonic treatment for 12-17 min, dehydrating at a temperature of 110-120 DEG C, adding a surfactant, continuously heating to a reaction temperature, carrying out heat preservation, and applying a static micro-magnetic field during the heat preservation to obtain a reaction product; and purifying the reaction product to obtain the FeCo hard magnetic nanowire. The invention provides a magnetic field-surfactant synergistically assisted wet chemical method, which is used for synthesizing bct-FeCo nanowires. According to the method, the single-phase hard magnetic bct-FeCo ordered nanometer one-dimensional structure is successfully prepared by synergistically utilizing crystal lattice stress induced by a surfactant ligand and a magnetic field orientation effect. The FeCo hard magnetic nanowire has relatively high coercive force.

This invention provides an Fe-based nanocrystalline alloy thin strip that can effectively reduce iron loss, a wound iron core using the same, and a method for manufacturing them. [Solution] The Fe-based nanocrystalline alloy thin strip has an uneven surface structure including at least one recess 1 with a depth of 3 μm or more that extends along the longitudinal direction L of the thin strip, or an uneven surface structure in which the maximum height roughness Rz in the width direction W of the thin strip is 3 μm or more, and magnetic domains are formed along the width direction W. Alternatively, the wound iron core is composed of a thin strip of Fe-based nanocrystalline alloy, and the width of the region in which the thin strip is continuous along the height direction of the wound iron core is 2.5 mm or less, and magnetic domains are formed along the height direction of the wound iron core.

Nanoparticulate material suitable for administration to a subject, the nanoparticulate material having bound to its surface: (a) copolymeric steric stabiliser that promotes dispersion of the nanoparticulate material in a liquid, wherein the copolymeric steric stabiliser comprises (i) an anchoring polymer segment having one or more binding groups that bind the copolymeric steric stabiliser to the nanoparticulate material, and (ii) a steric stabilising polymer segment that is different from the anchoring polymer segment, and (b) copolymeric mapping moiety comprising (i) an anchoring polymer segment having one or more binding groups that bind the copolymeric mapping moiety to the nanoparticulate material, (ii) one or more mapping groups comprising an agent that specifically binds to fibroblast activation protein (FAP), and (iii) a coupling polymer segment that is different to the anchoring polymer segment, wherein the coupling polymer segment couples the anchoring polymer segment to the one or more mapping groups.

The application discloses a preparation strategy of a single-layer magnetic cage lattice film material, and belongs to the technical field of nanometer materials.The application comprises the following steps: in an ultrahigh vacuum environment, Nb and Te are evaporated and deposited onto a substrate according to a certain deposition beam flow ratio by using a molecular beam epitaxy process, chemical bonding between the Nb and Te is realized through annealing treatment, and a single-layer magnetic cage lattice NbTe2 film material is obtained.The application realizes the preparation of the single-layer cage lattice NbTe2, and the single-layer cage lattice NbTe2 is subjected to atomic structure and magnetic characterization by means of a characterization system, so that the application has excellent scientific research value and wide application potential, and provides a new platform for in-depth scientific research and exploration of novel quantum physical properties.

[Problem] To provide: a composite-coated soft magnetic metal powder having exceptional green compact insulation properties, without causing any decrease in magnetic permeability, by combining a silicon oxide coating layer and a coating layer of a silicon compound that contains an organic substance; and a method for producing the same. [Solution] A composite-coated soft magnetic metal powder having exceptional green compact insulation properties without decreasing magnetic permeability can be obtained by forming, on the surface of soft magnetic metal particles containing 20 mass% or more of iron, a composite coating provided with a silicon oxide coating layer having an average thickness of 0.1-20 nm as a first layer and a silicon-containing coating layer having a structure in which silicon to which a C8-20 linear alkyl group is bonded is siloxane bonded as a second layer.

The invention discloses a preparation method of a magnetic metal composite nanomaterial. The invention relates to a preparation method of a metal palladium-iron nano material. The preparation method comprises the following steps: adding spherical nano ferroferric oxide powder into a solvent (water, ethanol, acetonitrile, methylbenzene and the like), carrying out ultrasonic reaction for half an hour, adding pentacarbonyl iron (1-10mmol / L) and palladium compounds (0.1-1mmol / L, palladium chloride, palladium nitrate, palladium sulfate, palladium acetate, bis (dibenzylideneacetone) palladium, bis (acetonitrile) palladium dichloride and the like, and the ratio of the amount of substance of the palladium element to the amount of substance of all iron elements is 0.01-0.1), sealing a reaction container, carrying out ultrasonic reaction for half an hour, and cooling to room temperature to obtain the spherical nano ferroferric oxide. Reacting at 80 DEG C for 2 hours, opening the reaction container, cooling to room temperature, and continuously reacting for 2 hours; and centrifuging the obtained reaction liquid to obtain brown solids, washing the brown solids, and carrying out vacuum drying on the obtained black solids to obtain black powder, namely the palladium-iron composite nanomaterial loaded on the spherical ferroferric oxide. The composite material obtained according to the method is good in dispersity and uniform in particle size, and the size is intensively distributed between 2 nm and 3 nm.

The present application relates to the technical field of biomedical materials, and particularly relates to biological application of prussian blue biomagnetic beads in protein enrichment. The present application provides prussian blue magnetic beads, a preparation method and application thereof, and through doping different metals in the prussian blue material, the magnetic property of the prussian blue material is enhanced, and effective enrichment of low-abundance proteins in blood plasma can be realized.

An object of the present application is to provide a magnetic particle including a secondary particle in which a plurality of primary particles are aggregated, each primary particle having a particle diameter deemed to exhibit superparamagnetism, and the secondary particle exhibiting a larger particle diameter. [Solution] This object is achieved by magnetic particles including secondary particles in which a plurality of primary particles are aggregated, in which the secondary particles have an average particle diameter of 500 nm or more and 5000 nm or less, and in which the plurality of primary particles have an average particle diameter of 2 nm or more and 20 nm or less.

To provide a new method for producing quantum dots of an iron-containing sulfide different from a conventional one.SOLUTION: A method for producing quantum dots of an iron-containing sulfide includes a step of preparing a mixed solution in which at least ferrous hydroxide is present in water at 0 °C or higher and 30 °C or lower, a step of preparing a green rust-containing suspension by oxidizing the mixed solution to form green rust crystals in the mixed solution, and a step of raising the temperature of the suspension to 50 °C or higher and 100 °C or lower in an oxygen-free stream. A method for producing iron-containing sulfide quantum dots, the method comprising: synthesizing the ferrite quantum dots in the slurry; collecting the ferrite quantum dots in the slurry; and treating the ferrite quantum dots with hydrogen sulfide gas at 110 °C. or more and 150 °C. or less to substitute sulfide ions O2 - for oxide ions S2 - in the ferrite, thereby producing iron-containing sulfide quantum dots.SELECTED DRAWING: Figure 1

The invention belongs to the technical field of biological medicine, and provides an iron-based nanodot capable of guiding MRI and delivering medicine and a preparation method and application of the iron-based nanodot. The iron-based nanodot is used as a chemotherapeutic drug carrier, and is prepared from a cell protective agent amifostine (AT) and key nutritional metal iron ions (Fe < 3 + >) for inducing ferroptosis through a supramolecular self-assembly technology. The iron-based nanodot can efficiently load the chemotherapeutic drug, improves pharmacokinetic behaviors such as short in-vivo circulation period and fast metabolism of the chemotherapeutic drug, accurately delivers the chemotherapeutic drug to a tumor site, and improves the drug effect of the chemotherapeutic drug; in addition, the iron-based nanodots can realize efficient ferroptosis treatment under the guidance of MRI to induce immunogenic cell death and inhibit growth, metastasis and diffusion of tumor cells.

In implementations described herein, processes, methods, and techniques are described for the detection of analytes in a sample using multiplexing methods for giant magnetoresistance sensors.

A magnetic device capable of field-free spin-orbit torque includes a fixed ferromagnetic layer, a free ferromagnetic layer, and an insulating layer positioned between the fixed ferromagnetic layer and the free ferromagnetic layer, wherein the free ferromagnetic layer includes an in-plane magnetic anisotropy ferrimagnetic layer, a perpendicular magnetic anisotropy free ferromagnetic layer, and a non-magnetic layer positioned between the in-plane magnetic anisotropy ferrimagnetic layer and the perpendicular magnetic anisotropy free ferromagnetic layer.

The invention discloses a NiCo-C-C / MXene composite material with excellent electromagnetic wave absorption performance and a preparation method of the NiCo-C-C / MXene composite material. According to the material, a multi-component heterogeneous interface engineering strategy is provided, a Prussian blue analogue precursor is coated with polydopamine, MXene is combined, and the NiCo (at) C (at) C / MXene composite material with a layered structure is prepared through high-temperature pyrolysis. Aiming at the problems of organic ligand loss, low carbon content, easy structure collapse, insufficient mechanical strength and conductivity and the like of the traditional PBA derivative material, the method effectively inhibits structural damage at high temperature by introducing a PDA shell layer rich in carbon sources, and meanwhile, a stable conductive network is constructed by utilizing the excellent conductivity of MXene. According to the finally prepared composite material, abundant heterogeneous interfaces and defect sites are constructed among the NiCo nanoparticles, the mixed crystallinity carbon matrix and the MXene layer, and the impedance matching and attenuation capabilities are remarkably optimized through the synergistic effect of interface polarization loss and multiple loss mechanisms.

The disclosed technology provides a nanofunctionalized magnetic material feedstock comprising: from 50 wt% to 99.5 wt% of magnetic microparticles having an average microparticle effective diameter from 1 micron to 500 microns; from 0.4 wt% to 40 wt% of one or more rare earth elements; and from 0.1 wt% to 10 wt% of metal-containing inoculant nanoparticles, wherein at least 1 wt% of the inoculant nanoparticles are chemically and / or physically disposed on surfaces of the magnetic microparticles. The nanofunctionalized magnetic material feedstock is processed using high-throughput laser-based additive manufacturing to optimize the architecture of NdFeB or other magnets, generating site-specific, demagnetization-resistant microstructures. This disclosure teaches a rapid, single-step laser-based process to tailor the easy axis alignment, grain size, and microstructure of a permanent magnet at corners and edges to resist demagnetization.

As a magnetoplasmonic particle that can have physical reactability, that is, arrangement variability to a magnetic field to implement an immediate self-assembly property, can be manufactured as a three-dimensional structure through a significantly simplified process compared to the conventional one based on this arrangement variability due to the application of the magnetic field, can be used in various technical fields because an additional change or adjustment of a geometrical of this three-dimensional structure is easy, there is provided the magnetoplasmonic particle including a core-shell particle including a core and a shell surrounding at least a part of a surface of the core and including a component different from a component of the core, and having the arrangement variability due to the application of the magnetic field.

This invention belongs to the field of graphene materials and discloses a magnetic nitrogen-doped reduced graphene oxide, its preparation method, and its application. The method includes the following steps: (1) preparation of frangipani extract; (2) adding iron salt, sodium acetate, and frangipani extract to an aqueous solution of graphene oxide, ultrasonically mixing until homogeneous, and then carrying out a hydrothermal reaction. After the reaction is complete, the solid is separated using a strong magnet and washed, and then freeze-dried to obtain magnetic nitrogen-doped reduced graphene oxide. The prepared magnetic nitrogen-doped reduced graphene oxide material, used as a glassy carbon electrode modification material, exhibits excellent electrochemical performance and can be applied in the rapid detection of Cd(II). The synthesis method of this invention has the advantages of being simple, easy to implement, and environmentally friendly. The prepared magnetic nitrogen-doped reduced graphene oxide has important application value in sensing, catalysis, optics, and electronics.