36results about "Organic/organo-metallic films" patented technology

Graphene magnet multilayers (GMMs) are employed to facilitate development of spintronic devices. The GMMs can include a sheet of monolayer (ML) or few-layer (FL) graphene in contact with a magnetic material, such as a ferromagnetic (FM) or an antiferromagnetic material. Electrode terminals can be disposed on the GMMs to be in electrical contact with the graphene. A magnetic field effect is induced in the graphene sheet based on an exchange magnetic field resulting from a magnetization of the magnetic material which is in contact with graphene. Electrical characteristics of the graphene can be manipulated based on the magnetization of the magnetic material in the GMM.

In an embodiment, a magneto-dielectric substrate comprises a dielectric polymer matrix; and a plurality of hexaferrite particles dispersed in the dielectric polymer matrix in amount and of a type effective to provide the magneto-dielectric substrate with a magnetic constant of less than or equal to 3.5 from 500 MHz to 1 GHz, or 3 to 8 from 500 MHz to 1 GHz, and a magnetic loss of less than or equal to 0.1 from 0 to 1 GHz, or 0.001 to 0.07 over 0 to 1 GHz.

The invention relates to a preparation method of an Fe<3>O<4>/graphene composite membrane. In summary, according to the method, by the process of mixing graphene oxide with Fe<3>O<4> nano-particles at a certain ratio to obtain a mixture solution, the Fe<3>O<4>/graphene composite membrane is prepared under drying and low-temperature stepped heating reduction conditions. The product prepared by the method is good in complex condition; the Fe<3>O<4> nano-particles are uniform to disperse; and the composite membrane has ferromagnetic property. The method disclosed by the invention is simple and easy to control; industrial production is facilitated; and the prepared self-supported composite membrane has a broad application prospect in the fields of information, electrons, energy, biology, military industry and the like.

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.

A graphene structure is provided. The graphene structure comprises a substrate layer and at least two graphene layers disposed on the substrate. The at least two graphene layers comprises a gate voltage tuned layer and an effective graphene layer and the effective graphene layer comprises one or more graphene layers. A magnetoresistance ratio of the graphene structure is determined by a difference in a charge mobility and/or a carrier density between the gate voltage tuned layer and the effective graphene layer. The charge mobility and/or the carrier density of the gate voltage tuned layer is tunable by a gate voltage applied to the graphene structure. A magnetic field sensor comprising the graphene structure is also provided.

A magnetic recording medium including: a support; and a magnetic layer provided on the support, the magnetic layer containing a magnetic particle of a CuAu type or Cu₃Au type ferromagnetic ordered alloy phase, wherein a content of boron in the magnetic particle is 0 to 0.9 at %, and a content of fluorine in the magnetic particle is 0.09 to 0.3 at %. Also provided is a method for producing a magnetic recording medium including: forming an alloy particle capable of forming a CuAu type or Cu₃Au type ferromagnetic ordered alloy phase by a reduction method in which a reducing agent containing a boron atom is used; forming a layer including the alloy particle on a support; heat-treating the alloy particle at a temperature below a transformation temperature of the alloy particle; and annealing the alloy particle at a temperature which is not lower than the transformation temperature of the alloy particle.

A nanostructured material regularly arrayed over a large area comprising regularly arrayed domain structures formed on a substrate and having therein regularly arrayed pores with a size of 2 to 200 nm and nanoparticles incorporated into the pores.

The invention provides an ethylene glycol-based magnetic fluid composite film and a preparation method thereof, which relate to the technical field of magnetic composite materials and are mainly prepared from the following components in parts by mass: ethylene glycol-based magnetic fluid 90-110 15-25 parts of polyvinyl alcohol, 70-90 parts of deionized water, among which, the ethylene glycol-based magnetic fluid is mainly prepared from nano ferric oxide, ethylene glycol and a dispersion stabilizer, which relieves the existing magnetic fluid Among them, the carrier liquid matrix is ​​water-based or oil-based, so that the degree of dispersion of magnetic nanoparticles has not been significantly improved, resulting in the technical problem that the performance of the magnetic fluid composite film is limited. The ionic water cooperates with each other to make the magnetic particles evenly distributed in the composite film, so that the composite film can maintain good paramagnetic properties, the saturation magnetization is larger, the magnetic susceptibility per unit mass is higher, and the strain capacity is better. The technical effect of better magnetic properties.

The invention discloses a polymer flexible conductive film and a preparation method thereof, and belongs to the technical field of polymer material preparation. The polymer flexible conductive film comprises a generation layer and a forming layer, and the generation layer mainly comprises the following components: 3, 4-ethylenedioxythiophene; polystyrene sulfonic acid; ferroferric oxide; tin oxide; indium oxide; magnesium hydroxide; the forming layer mainly comprises the following components: an organic salt solution; and a reinforcing agent; according to the invention, the tensile property and the shielding effectiveness of the produced film are effectively improved by utilizing the sputtering spraying reaction of magnesium hydroxide and graphite, and the problem of low overall conductivity caused by magnesium hydroxide is neutralized by tin oxide and indium oxide; and the organic salt solution of 4-pyridine acetate hydrochloric acid can effectively enhance the flexibility and heat resistance of the polymer flexibility.