60results about "Low dimensional magnetism materials" patented technology

A long range, periodically ordered array of discrete nano-features (10), such as nano-islands, nano-particles, nano-wires, non-tubes, nano-pores, nano-composition-variations, and nano-device-components, are fabricated by propagation of a self-assembling array or nucleation and growth of periodically aligned nano-features. The propagation may be induced by a laterally or circularly moving heat source, a stationary heat source arranged at an edge of the material to be patterned (12), or a series of sequentially activated heaters or electrodes. Advantageously, the long-range periodic array of nano-features (10) may be utilized as a nano-mask or nano-implant master pattern for nano-fabrication of other nano-structures. In addition, the inventive long-range, periodically ordered arrays of nano-features are useful in a variety of nanoscale applications such as addressable memories or logic devices, ultra-high-density magnetic recording media, magnetic sensors, photonic devices, quantum computing devices, quantum luminescent devices, and efficient catalytic devices.

A nanopost glass array contains up to 1012 / cm2 of magnetizable nanoposts having diameter of 10-1000 nm that are straight and parallel to each other and are typically of a uniform diameter relative to each other and along the post length. The array is made using a reference electrode and a nanochannel glass template structure connected to each other electrically through an electrical source and both disposed in a plating solution. A magnetizable material is electroplated from the plating solution into the channels of the template structure.

A direct-write method and apparatus for depositing a functional material with a preferred orientation onto a target surface. The method comprises the following steps: (1) forming a precursor fluid to the functional material, with the fluid containing a liquid component; (2) operating a dispensing device to discharge and deposit the precursor fluid onto the target surface in a substantially point-by-point manner and at least partially removing the liquid component from the deposited fluid to form a thin layer of the functional material which is substantially solidified and is of a predetermined pattern; and (3) during the liquid-removing step, subjecting the deposited fluid to a highly localized electric or magnetic field for poling until a preferred orientation is attained in the deposited functional material. The invention also provides a freeform fabrication method for building a multi-layer device, such as a micro-electro-mechanical system (MEMS), which contains sensor and actuator elements that exhibits piezoelectric, pyroelectric, ferromagnetic, electro-optic and / or other functional properties.

A nanowire structure and device for use in large area electronics and methods of making the same is provided. The nanowire structure includes a nanowire defining an axis, where the nanowire includes a first end and a second end. The first end is axially spaced from the second end. Further, the nanowire structure includes magnetic segments that are coupled to the first and second ends of the nanowire.

The self-assembly of a close-packed, highly-ordered monolayers of molecularly protected nanoparticles on an assembly surface is disclosed. Also disclosed is the transfer of a nanoparticle monolayer from an assembly surface to a transfer surface. The transfer of a monolayer or multilayer structure of nanoparticles from a transfer surface to a substrate by conformal contact of the transfer surface with the substrate is disclosed. Also disclosed is the removal of protective molecules from nanoparticle cores by exposure to an oxidizing atmosphere (optionally in the presence of UV radiation). The exchange of protective molecules in molecularly protected nanoparticles with other molecules is also disclosed.

A process of forming a hard-soft phase, exchange-coupled, magnetic nanocomposite includes forming a dispersion of magnetic nanoparticles, separating the magnetic nanoparticles from a solvent of the dispersion so as to allow self-assembly of the magnetic nanoparticles, and removing a coating from the nanoparticles, which are disposed in a self-assembled, locally-ordered nanostructure.

A method of producing at least one of microscopic and submicroscopic particles includes providing a template that has a plurality of discrete surface portions, each discrete surface portion having a surface geometry selected to impart a desired geometrical property to a particle while being produced; depositing a constituent material of the at least one of microscopic and submicroscopic particles being produced onto the plurality of discrete surface portions of the template to form at least portions of the particles; separating the at least one of microscopic and submicroscopic particles comprising the constituent material from the template into a fluid material, the particles being separate from each other at respective discrete surface portions of the template; and processing the template for subsequent use in producing additional at least one of microscopic and submicroscopic particles. A multi-component composition includes a first material component in which particles can be dispersed, and a plurality of particles dispersed in the first material component. The plurality of particles is produced by methods according to embodiments of the current invention.

A synthetic method of fabricating highly crystalline and monodisperse nanoparticles of metals, multi-metallic alloys, monometallic oxides and multi-metallic oxides without a size selection process are disclosed. A typical synthetic method comprises the steps of, synthesis of a metal surfactant complex from the reaction of a metal precursor and a surfactant, high temperature thermal decomposition of the metal surfactant complex to produce monodisperse metal nanoparticles, and completing the formation of synthesized metal, metal alloy or metal oxide nanoparticles by adding a poor solvent followed by centrifuging. For obtaining highly crystalline monodisperse nanoparticles, additional steps are necessary as described in the invention. The resulting nanoparticles have excellent magnetic property for many applications.

A self-assembled nanobump array structure including a semi-absorbing outer layer provided on at least one nanobump-forming substrate layer, the semi-absorbing outer layer configured to ablate slowly to allow an applied laser energy to be transmitted to the at least one nanobump-forming substrate layer, in which the self-assembled nanobump array structure is formed by an energy and a pressure buildup occurring in the at least one nanobump-forming substrate layer.

A method and apparatus for microencapsulating or electrodeposited coating of ferromagnetic and soft-magnetic sub-micron or nano sized powderized material comprising use of a rotary flow-through device assisted by an electromagnet within the electrode ring to alternately position the powder at the face of the cathode ring and electroplate the powder and reorient it prior to another repositioning. The invention is also of a process and apparatus for forming a strip, mesh, or film from magnetic powderized material in an organized bipolar arrangement, which is particularly useful for electroforming foils with the magnetic particles positioned in a monolayer within a multilayer metallic foil.

An acoustic wave sensor to detect an analyte, the sensor comprising a piezoelectric material including a wide bandgap semiconductor material grown using plasma source molecular beam epitaxy.

A method and resultant device, in which metal nanoparticles are self-assembled into two-dimensional lattices. A periodic hole pattern (wells) is fabricated on a photoresist substrate, the wells having an aspect ratio of less than 0.37. The nanoparticles are synthesized within inverse micelles of a polymer, preferably a block copolymer, and are self-assembled onto the photoresist nanopatterns. The nanoparticles are selectively positioned in the holes due to the capillary forces related to the pattern geometry, with a controllable number of particles per lattice point.

Nanostructures and methods of making nanostructures having self-assembled nanodot arrays wherein nanodots are self-assembled in a matrix material due to the free energies of the nanodot material and / or differences in the Gibb's free energy of the nanodot materials and matrix materials.

A synthetic method of fabricating highly crystalline and monodisperse nanoparticles of metals, multi-metallic alloys, monometallic oxides and multi-metallic oxides without a size selection process are disclosed. A typical synthetic method comprises the steps of, synthesis of a metal surfactant complex from the reaction of a metal precursor and a surfactant, high temperature thermal decomposition of the metal surfactant complex to produce monodisperse metal nanoparticles, and completing the formation of synthesized metal, metal alloy or metal oxide nanoparticles by adding a poor solvent followed by centrifuging. For obtaining highly crystalline monodisperse nanoparticles, additional steps are necessary as described in the invention. The resulting nanoparticles have excellent magnetic property for many applications.

A method and system for magnetic recording using self-organized magnetic nanoparticles is disclosed. The method may include depositing surfactant coated nanoparticles on a substrate, wherein the surfactant coated nanoparticles represent first bits of recorded information. The surfactant coating is then removed from selected of the surfactant coated nanoparticles. The selected nanoparticles with their surfactant coating removed may then be designated to represent second bits of recorded information. The surfactant coated nanoparticles have a first saturation magnetic moment and the selected nanoparticles with the surfactant coating removed have a second saturation magnetic moment. Therefore, by selectively removing the surfactant coating from certain nanoparticles, a write operation for recording the first and second bits of information may be performed. A read operation may be carried out by detecting the different magnetic moments of the surfactant coated nanoparticles and the non-surfactant coated nanoparticles.

A method and resultant device, in which metal nanoparticles are self-assembled into two-dimensional lattices. A periodic hole pattern (wells) is fabricated on a photoresist substrate, the wells having an aspect ratio of less than 0.37. The nanoparticles are synthesized within inverse micelles of a polymer, preferably a block copolymer, and are self-assembled onto the photoresist nanopatterns. The nanoparticles are selectively positioned in the holes due to the capillary forces related to the pattern geometry, with a controllable number of particles per lattice point.

A method and apparatus for microencapsulating or electrodeposited coating of ferromagnetic and soft-magnetic sub-micron or nano sized powderized material comprising use of a rotary flow-through device assisted by an electromagnet within the electrode ring to alternately position the powder at the face of the cathode ring and electroplate the powder and reorient it prior to another repositioning. The invention is also of a process and apparatus for forming a strip, mesh, or film from magnetic powderized material in an organized bipolar arrangement, which is particularly useful for electroforming foils with the magnetic particles positioned in a monolayer within a multilayer metallic foil.

An anhydrous chloride with a formula of MCl2 (M=Fe, Co or Ni) is dissolved into an anhydrous acetonitrile solvent to form a chloride-acetonitrile solution. Then, calcium carbide minute powders are added and dispersed in the chloride-acetonitrile solution to form a reactive solution. Then, the reactive solution is thermally treated (first thermal treatment) to form a nano-powder made of a transition metal acetylide compound having an M-C2-M bond, a tetragonal structure, and a formula of MC2 (herein, M=Fe, Co or Ni). Then, the nano-powder is thermally treated (second thermal treatment) again at a temperature higher than the temperature in the first thermal treatment to form a carbon layer-covering transition metallic nano-structure wherein a metallic core made of the transition metal M is covered with a carbon layer.

The invention discloses preparation and an application of a magnetic nanoring microwave absorbing agent, and particularly relates to a magnetic nanoring microwave absorbing agent with characteristics of good monodispersity and homogeneity, high magnetic responsiveness, excellent microwave absorbing performance, adjustable size and composition and the like as well as a preparation method and an application of the magnetic nanoring microwave absorbing agent. A magnetic nanoring adopts a polycrystalline structure formed by agglomeration of nanocrystallines and is oval, the length of a long axis is 28-175 nm, the length of a short axis is 18-130 nm, and the ring wall thickness is 7-35 nm; the magnetic nanoring comprises the component of Fe3O4, Fe3O4 / C or Fe / C with a spinel structure; ferric glycolate is taken as a precursor, and the magnetic nanoring is prepared by adopting an inert gas protective carbothermic reduction method-carbonization-solid-phase diffusion growth cooperation mechanism. The preparation and the application of the magnetic nanoring microwave absorbing agent are simple in process, low in cost and high in efficiency and facilitate industrial application and popularization, and the Fe3O4 and the carbon-magnetic nanoring have broad application prospects in the aspects of microwave absorption, a catalyst, an electrode material, a magnetic recording material, a biological sensor, separation or medical imaging.

A magnetic artificial honeycomb lattice comprising a multiplicity of connecting elements separated by hexagonal cylindrical pores, wherein:(a) the hexagonal cylindrical pores:(i) have widths that are substantially uniform and an average width that is in a range of about 15 nm to about 20 nm; and(ii) are substantially equispaced and have an average center-to-center distance that is in a range of about 25 nm to about 35 nm; and(b) the connecting elements comprise a magnetic material layer, and the connecting elements have:(i) lengths that are substantially uniform and an average length that is in a range of about 10 nm to about 15 nm;(ii) widths that are substantially uniform and an average width that is in a range of about 4 nm to about 8 nm; and(iii) a thickness of the magnetic material layer that is substantially uniform and an average thickness that is in a range of about 2 nm to about 8 nm; and(c) the magnetic artificial honeycomb lattice has a surface area, disregarding the presence of the hexagonal cylindrical pores, that is in a range in a range of about 100 mm2 to about 900 mm2.

The present invention relates to a method for preparing a magnetic iron oxide-graphene composite, a magnetic iron oxide-graphene composite prepared thereby and a composition for electromagnetic wave shielding including the same, and since graphene is prepared from a stage 1-GIC using FeCl3, magnetic particles in the form of FeOx are naturally formed on the surface of graphene during the preparation process. In addition, a magnetic material is formed on the surface of graphene while the defects of graphene are minimized, and thus the magnetic iron oxide-graphene composite prepared according to the present invention can be useful as an electromagnetic wave absorber.

A magnetic thin film of the present invention comprises: a substrate; and a ferromagnetic film being formed on the substrate and having an average diameter of 0.1 to 10 mum, a thickness of 0.005 to 1.5 mum and a ratio of the thickness to the average diameter of not more than 0.5:1, wherein the ferromagnetic film having at a center portion thereof a perpendicular magnetization component, which is oriented or magnetized in the up or down direction perpendicular to the surface of the magnetic thin film.

A method for manufacturing a bit patterned magnetic media for magnetic data recording. The method includes patterning a topography that includes an array of raised regions separated by a recessed portion. The array can be patterned by micro-printing using a stamp that has raised islands. The raised regions can have a height of 1 to 5 nm as measured from the recessed region. A magnetic alloy and a non-magnetic segregant are then co-sputtered. The magnetic alloy preferentially grows over the raised portions and the non-magnetic segregant grow preferentially over the recessed region between the raised portions.

The invention provides a regulation and control method for a Skyrmion in a hexagonal MnNiGa. The regulation and control method comprises the following steps of 1) applying a magnetic field to the hexagonal MnNiGa, wherein the magnetic field is not strong enough to convert a strip-shaped magnetic domain in the hexagonal MnNiGa into the Skyrmion; and the direction of the magnetic field is not parallel to a family of crystal plane [001] in the hexagonal MnNiGa; and 2) applying a current to or / and heating the hexagonal MnNiGa to enable the strip-shaped magnetic domain to disappear. By virtue of the regulation and control method, a high-density Skyrmion array is formed in the hexagonal MnNiGa material system; and in addition, the high-density Skyrmion can exist in both of a null field and a wide-temperature-range room temperature.

The invention discloses an improved magnetic silicon particle. The preparation method of the improved magnetic silicon particle comprises the following steps: 1) preparing two-dimensional titanium dioxide nano-sheet; 2) prepare a two-dimensional magnetic titanium dioxide sheet; 3) prepare improved silicon-coated two-dimensional magnetic titanium dioxide wafer. The improved magnetic silicon particles of the invention have high binding capacity to nucleic acids and little adsorption to salt ions, proteins or other impurities, and can effectively solve the phenomenon of virtual high nucleic acidextraction concentration. A method for improve magnetic silicon particles for nucleic acid purification include such steps as using improved magnetic silicon particles as magnetic particle for nucleicacid purification, preparing nucleic acid purification kit with lysis solution, binding solution, cleaning solution and eluent, and extracting high-purity and high-yield nucleic acid from biologicalsample through that kit.

A magnetic film comprises a platinum layer having a (001) plane orientation and an island-shaped iron-platinum crystalline arranged on the platinum layer and having a (001) plane orientation parallel to the (001) plane orientation of the platinum layer, wherein the island-shaped iron-platinum crystalline has a composition region consisting of 50 atomic % of each of iron and platinum and exhibits a perpendicular magnetic anisotropy having a high coercive force in a direction perpendicular to the surface of the platinum layer.

A method and system for magnetic recording using self-organized magnetic nanoparticles is disclosed. The method may include depositing surfactant coated nanoparticles on a substrate, wherein the surfactant coated nanoparticles represent first bits of recorded information. The surfactant coating is then removed from selected of the surfactant coated nanoparticles. The selected nanoparticles with their surfactant coating removed may then be designated to represent second bits of recorded information. The surfactant coated nanoparticles have a first saturation magnetic moment and the selected nanoparticles with the surfactant coating removed have a second saturation magnetic moment. Therefore, by selectively removing the surfactant coating from certain nanoparticles, a write operation for recording the first and second bits of information may be performed. A read operation may be carried out by detecting the different magnetic moments of the surfactant coated nanoparticles and the non-surfactant coated nanoparticles.