A method for producing MnZn ferrite comprising Fe, Mn and Zn as main components, and Ca, Si and Co, and at least one selected from the group consisting of Ta, Nb and Zr as sub-components, comprising a step of molding a raw material powder for the MnZn ferrite to obtain a green body, and a step of sintering the green body; the sintering step comprising a temperature-elevating step, a high-temperature-keeping step, and a cooling step; the cooling step including a slow cooling step of cooling in a temperature range of 1100 C. to 1250 C. at a cooling speed of 0 C./hour to 20 C./hour for 1 hours to 20 hours, and a cooling speed before and after the slow cooling step being higher than 20 C./hour; the MnZn ferrite having a volume resistivity of 8.5 .Math.m or more at room temperature, an average crystal grain size of 7 m to 15 m, and core loss of 420 kW/m.sup.3 or less between 23 C. and 140 C. at a frequency of 100 kHz and an exciting magnetic flux density of 200 mT.

Disclosed are an electromagnetic induction device and a method for manufacturing the same. The device comprises a magnetic cover (110) and at least one set of coils (120). The magnetic cover (110) consists of two or more magnetic units (111), and a closed magnetic flux loop can be formed within each magnetic unit (111). The magnetic units (111) are joined together to form a substantially closed integrated body having at least one cavity (112) therein, and dividing surfaces between the magnetic units (111) are disposed substantially along the magnetic flux loop without interrupting the magnetic flux loop. The coils (120) are placed in the cavity (112) formed by the magnetic cover (110), electrodes of the coils (120) are led out of the magnetic cover (110), and the magnetic flux loop in the magnetic cover (110) is formed after energization of the coils (120). The electromagnetic induction device of the present invention can substantially close coils, preventing magnetic flux leakage to a maximum extent. Further, since dividing surfaces between magnetic units are disposed along a magnetic flux loop, no air gap is generated in the magnetic flux loop, thereby effectively decreasing magnetic resistance.

A core-shell particle includes: a core including an iron oxyhydroxide compound represented by Formula A.sup.3.sub.a3Fe.sub.1a3OOH (in which A.sup.3 represents at least one metal element other than Fe, and a3 satisfies 0<a3<1) or at least one iron oxide compound selected from the group consisting of Fe.sub.2O.sub.3, a compound represented by Formula A.sup.1.sub.a1Fe.sub.2a1O.sub.3 (in which A.sup.1 represents at least one metal element other than Fe, and a1 satisfies 0<a1<2), Fe.sub.3O.sub.4, and a compound represented by Formula A.sup.2.sub.a2Fe.sub.3a2O.sub.4 (in which A.sup.2 represents at least one metal element other than Fe, and a2 satisfies 0<a2<2); and a shell which covers the core and includes a polycondensate of a metal alkoxide.

A composite magnetic material includes a soft magnetic material and a hard magnetic material. The soft magnetic material and the hard magnetic material each contain elemental iron, 90 atom % or more and 100 atom % or less of the elemental iron contained in the soft magnetic material forms a first oxide or a first composite oxide, and 90 atom % or more and 100 atom % or less of the elemental iron contained in the hard magnetic material forms a second oxide or a second composite oxide.

The present invention concerns a magnetic-photoconductive material including orientable magnetic moments or spins, the material being configured to generate photo-carriers permitting to orientate or re-orientate the magnetic moments or spins at a material temperature less than the Curie Temperature (T.sub.C) or Curie point.

A magnetoelectric effect material includes as a primary component, a polycrystalline oxide ceramic containing at least Sr, Co, and Fe. In the polycrystalline oxide ceramic, the crystal c-axis is oriented in a predetermined direction, and the degree of orientation of the c-axis is 0.2 or more by a Lotgering method. A component substrate is formed of this magnetoelectric effect material.

Disclosed is a method of manufacturing a ferrite magnetic substance, including: a first mixing operation of providing a first mixture composed of 47 to 49 wt % of Fe, 16 to 18 wt % of Mn, 5.2 to 7.2 wt % of Zn, and a remainder of oxygen and other inevitable impurities, a second mixing operation of providing a second mixture composed of the first mixture and an additive including, based on 100 parts by weight of the first mixture, 28 to 51 ppm of Si, 140 to 210 ppm of Nb and 155 to 185 ppm of Zr, and a finish operation of producing a ferrite magnetic substance by sintering the second mixture.

The disclosure relates to the manufacture of inductive components, in particular transformers, using a combination of microfabrication techniques and discrete component placement. By using a prefabricated core, the core may be made much thicker than one that is deposited using microfabrication techniques. As such, saturation occurs later and the efficiency of the transformer is improved. This is done at a much lower cost than the cost of producing a thicker core by depositing multiple layers using microfabrication techniques.

Composite electronic including coil, capacitor and intermediate parts, wherein coil part includes coil-conductor and magnetic-layer, capacitor part includes internal electrodes and dielectric-layer, which contains SrOTiO2 or ZnOTiO2 based oxide, intermediate part between coil and capacitor parts, intermediate part includes intermediate material layer, which contains ZnO, TiO2 and boron, ZnO contained in intermediate material layer 50-85 parts by mole and TiO2 contained the intermediate material layer 15-50 parts by mole when total content of ZnO and TiO2 in intermediate material layer is 100 parts by mole, content boron in intermediate material layer is 0.1-5.0 parts by weight of B2O3 when total of ZnO and TiO2 in intermediate material layer set to 100 parts by weight, part of ZnO and TiO2 intermediate material layer constitute ZnOTiO2 compound, which in intermediate material layer is 50 wt % or more when total weight of ZnO and TiO2 in intermediate material layer is set to 100 wt %.

A composite permanent magnet comprises a first phase including a magnetically hard material and a second phase including a magnetic material. Each of the materials has an anisotropy value selected such that a ratio of the values falls within a predefined range and a resulting grain size of the magnetic material is greater than a predefined threshold defined by the predefined range.