The present invention provides a method for preparing iron oxide magnetic particles and iron oxide magnetic particles prepared thereby, wherein the method includes (a) synthesizing a complex by reacting iron and one or more compounds selected from the group consisting of an aliphatic hydrocarbonate having 4 to 25 carbon atoms and an amine compound, (b) synthesizing an iron oxide crystal nucleus by mixing the complex with a mixture of an unsaturated aliphatic hydrocarbon-based compound having 4 to 25 carbon atoms and an ether-based compound, and (c) forming a shell by mixing the iron oxide crystal nucleus and an MXn compound with a mixture of an unsaturated aliphatic hydrocarbon-based compound having 4 to 25 carbon atoms and an ether-based compound, wherein M is a heavy atom element, X is a halogen element, and n is an integer of 1 to 6.

The present invention provides iron oxide magnetic particles including an iron oxide and MX.sub.n, wherein M includes one or more selected from the group consisting of Cu, Sn, Pb, Mn, Ir, Pt, Rh, Re, Ag, Au, Pd, and Os, X includes one or more selected from the group consisting of F, Cl, Br, and I, and n is an integer of 1 to 6.

Disclosed herein is a method comprising disposing a first particle in a reactor; the first particle being a magnetic particle or a particle that can be influenced by a magnetic field, an electric field or a combination of an electrical field and a magnetic field; fluidizing the first particle in the reactor; applying a uniform magnetic field, a uniform electrical field or a combination of a uniform magnetic field and uniform electrical field to the reactor; elevating the temperature of the reactor; and fusing the first particles to form a monolithic solid.

A wireless power transmission device is disclosed. The wireless power transmission device comprises a first coil and a second coil electromagnetically coupled to the first coil without contacting the first coil. A portion of one of the first coil and the second coil extends through a space defined by the other of the first coil and the second coil.

A magnetic sheet according to the present invention contains Mn—Zn ferrite as a main component and is comprised of a sheet-shaped sintered body. Besides, a ratio of Z.sub.MIN to Z.sub.MAX (Z.sub.MIN/Z.sub.MAX×100) is 90% or more, in which a maximum value of a content of Zn in terms of oxide is set to Z.sub.MAX and a minimum value of the content of Zn in terms of oxide is set to Z.sub.MIN in a thickness direction of a cross section of the sintered body.

Disclosed herein is a method comprising disposing a first particle in a reactor; the first particle being a magnetic particle or a particle that can be influenced by a magnetic field, an electric field or a combination of an electrical field and a magnetic field; fluidizing the first particle in the reactor; applying a uniform magnetic field, a uniform electrical field or a combination of a uniform magnetic field and a uniform electrical field to the reactor; elevating the temperature of the reactor; and fusing the first particles to form a monolithic solid.

A magnetic film includes a first layer having a real part of complex magnetic permeability of 50 or more and an imaginary part of complex magnetic permeability of below 30 at 10 MHz, and a second layer provided on the first layer and having a real part of complex magnetic permeability of 50 or more and an imaginary part of complex magnetic permeability of 30 or more at 10 MHz.

A magnetic material includes a soft magnetic metal grain containing Fe, and a multilayer oxide film covering the surfaces of the soft magnetic metal grain. The multilayer oxide film has a first oxide layer of crystalline nature containing Fe, and a second oxide layer of amorphous nature containing Si. In an embodiment, the silicon oxide film of amorphous nature is formed by dripping, divided into multiple sessions, a treatment solution containing TEOS (tetraethoxy silane), ethanol, and water into a mixed solution containing the soft magnetic metal grain, ethanol, and ammonia water, to mix the solutions.

A magnetoelectric multiferroic nanocomposite. The nanocomposite comprises a ferroelectric perovskite oxide and a rare-earth substituted mixed ternary transition metal ferrite of the formula A.sub.1xB.sub.xR.sub.yFe.sub.2yO.sub.4. The nanocomposite has a high dielectric constant, low dielectric loss, both stable over a wide frequency range. These properties may make the nanocomposite desirable for applications in microelectronic devices, sensors and antennas.

The present invention provides an oxide superconducting bulk magnet which can obtain a sufficient amount of total magnetic flux, by preventing the superconducting bulk body from being broken due to electromagnetic stress and quenching phenomenon to enable magnetization by a strong magnetic field. An oxide superconducting bulk magnet comprising an oxide superconducting bulk body wherein RE.sub.2BaCuO.sub.5 is dispersed in a monocrystalline RE.sub.1Ba.sub.2Cu.sub.3O.sub.y; and an outer peripheral reinforcing ring fitted to the outer periphery of the oxide superconducting bulk body, wherein the outer peripheral reinforcing ring is made of a plurality of metal rings having a multiple ring structure in the radial direction, at least one of the plurality of metal rings has a thermal conductivity of 20 W/(m.Math.K) or more at a temperature of 20 to 70 K and at least one of the plurality of metal rings has a higher strength than the metal ring having a thermal conductivity of 20 W/(m.Math.K) or more.