Abstract: Provided is a ferrite sintered magnet including a ferrite phase having a magnetoplumbite-type crystal structure. x, y, and m satisfy the following Equations (1), (2), and (3) when composition of the ferrite sintered magnet is represented by R1-xAxFem-yCoy, where R denotes at least one kind of element selected from rare earth elements including Y and A denotes Ca or Ca and elements including at least one kind selected from Sr or Ba. The content of B in the ferrite sintered magnet is from 0.1% to 0.6% by mass in terms of B2O3. 0.2?x?0.8??(1) 0.1?y?0.

Abstract: A sintered ferrite magnet having a composition of metal elements of Ca, R, A, Fe and Co, which is represented by the general formula of Ca1?x?yRxAyFe2n?zCoz, wherein R is at least one of rare earth elements indispensably including La; A is Sr and/or Ba; x, y, z and n represent the atomic ratios of Ca, R, A, Fe and Co; 2n represents a molar ratio expressed by 2n=(Fe+Co)/(Ca+R+A); and x, y, z and n meet the conditions of 0.15?x?0.35, 0.05?y?0.40, (1?x?y)>y, 0<z?0.18, and 7.5?(2n?z)<11.0.

Abstract: In an aspect, a Co2Z ferrite has the formula: (Ba1-xSrx)3Co2+yMyFe24-2y-zO41. M is at least one of Mo, Ir, or Ru. The variable x can be 0 to 0.8, or 0.1 to 0.8. The variable y can be 0 to 0.8, or 0.01 to 0.8. The variable z can be ?2 to 2. The Co2Z ferrite can have an average grain size of 5 to 100 nanometers, or 30 to 80, or 10 to 40 nanometers as measured using at least one of transmission electron microscopy, field emission scanning electron microscopy, or x-ray diffraction.

Abstract: This ferrite sintered magnet comprises ferrite phases having a magnetoplumbite type crystal structure. This magnet comprises an element R, an element M, Fe, Co, B, Mn and Cr, the element R is at least one element selected from rare earth elements including Y, the element M is at least one element selected from the group consisting of Ca, Sr and Ba, with Ca being an essential element, and when an atomic composition of metallic elements is represented by R1-xMxFem-yCoy, x, y and m satisfy formulae: 0.2?x?0.8??(1) 0.1?y?0.65??(2) 3?m<14??(3). Additionally, a content of B is 0.1 to 0.4% by mass in terms of B2O3, a content of Mn is 0.15 to 1.02% by mass in terms of MnO, and a content of Cr is 0.02 to 2.01% by mass in terms of Cr2O3.

Abstract: A hobby projectile may include, but is not limited to: a ball-type projectile having a substantially spherical shape and constructed at least partially of a foam material; and a magnetic or magnetizable component. At least a portion of the ball-type projectile may be at least partially coated with a magnetic or magnetizable component or may include magnetic or magnetizable particles and/or fibers embedded therein.

Abstract: Methods of forming spinel ferrite nanoparticles containing a chromium-substituted copper ferrite as well as properties (e.g. particle size, crystallite size, pore size, surface area) of these spinel ferrite nanoparticles are described. Methods of preventing or reducing microbe growth on a surface by applying these spinel ferrite nanoparticles onto the surface in the form of a suspension or an antimicrobial product are also described.

Abstract: A ferrite sintered magnet comprises a plurality of main phase grains containing a ferrite having a hexagonal structure, wherein at least some of the main phase grains are core-shell structure grains each having a core and a shell covering the core; and wherein the minimum value of the content of La in the core is [La]c atom %; the minimum value of the content of Co in the core is [Co]c atom %; the maximum value of the content of La in the shell is [La]s atom %; the maximum value of the content of Co in the shell is [Co]s atom %; [La]c+[Co]c is 3.08 atom % or more and 4.44 atom % or less; and [La]s+[Co]s is 7.60 atom % or more and 9.89 atom % or less.

Abstract: This ferrite sintered magnet comprises metallic elements at an atomic ratio represented by formula (1): Ca1-w-xRwSrxFezCom??(1) in formula (1), R is at least one element selected from the group consisting of rare-earth elements and Bi, and R comprises at least La, in formula (1), w, x, z and m satisfy formulae (2) to (5): 0.360?w?0.420??(2) 0.110?x?0.173??(3) 8.51?z?9.71??(4) 0.208?m?0.269??(5), and in a section parallel to an axis of easy magnetization, when the number of total ferrite grains is N and the number of ferrite grains having a stacking fault is n, 0?n/N?0.20 is satisfied.

Abstract: This ferrite sintered magnet comprises metallic elements at an atomic ratio represented by formula (1): Ca1-w-xRwSrxFezCom??(1) in formula (1), R is at least one element selected from the group consisting of rare-earth elements and Bi, and R comprises at least La, in formula (1), w, x, z and m satisfy formulae (2) to (5): 0.360?w?0.420??(2) 0.110?x?0.173??(3) 8.51?z?9.71??(4) 0.208?m?0.269??(5), and in a section parallel to an axis of easy magnetization, when the number of total ferrite grains is N and the number of ferrite grains having a stacking fault is n, 0?n/N?0.20 is satisfied.

Abstract: A sintered ferrite magnet having a composition of metal elements of Ca, R, A, Fe and Co, which is represented by the general formula of Ca1-x-yRxAyFe2n-zCoz, wherein R is at least one of rare earth elements indispensably including La; A is Sr and/or Ba; x, y, z and n represent the atomic ratios of Ca, R, A, Fe and Co; 2n represents a molar ratio expressed by 2n=(Fe+Co)/(Ca+R+A); and x, y, z and n meet the conditions of 0.15?x?0.35, 0.05?y?0.40, (1-x-y)>y, 0<z?0.18, and 7.5?(2n-z)<11.0.

Abstract: A production method for metal oxide particles includes: obtaining precursor particles of a metal oxide by performing a synthesis reaction of the precursor particles in the presence of an organic compound; and converting the obtained precursor particles into metal oxide particles by heating an aqueous solution containing the precursor particles to 300° C. or higher and pressurizing the aqueous solution at a pressure of 20 MPa or higher.

Abstract: The magnetic tape includes a magnetic layer having ferromagnetic powder and a binder on a non-magnetic support, in which the magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm3, and an edge shape of the timing-based servo pattern specified by a magnetic force microscope observation is a shape in which a difference (l99.9?l0.1) between a value l99.9 of a cumulative frequency function of 99.9% of a position deviation width from an ideal shape in a longitudinal direction of the magnetic tape and a value l0.1 of the cumulative frequency function of 0.1% thereof is equal to or smaller than 180 nm.

Abstract: Disclosed herein are compositions and methods of making a hard magnetic material from iron oxide fines, the hard magnetic material having a general formula MFexOy. In one aspect, the method comprises a) providing an iron oxide fine; b) providing a metal carbonate of a general formula Mx(CO3)y; c) mixing the iron oxide fine and the metal carbonate to form a mixture; d) calcining the mixture of the iron oxide fine and the metal carbonate; wherein M is a divalent metal ion.

Abstract: The present invention provides an apparatus and a method for coating small Nd—Fe—B magnets. The apparatus includes a furnace having a roller including at least one stirring piece disposed in the compartment. The stirring pieces have an isosceles triangle or trapezoidal shaped cross-section. The side wall of the furnace defines an inlet aperture and an outlet aperture disposed diametrically opposed to one another. A plurality of target source holders include two first target source holders and two second target source holders disposed on the side wall and spaced from one another and between the inlet aperture and the outlet aperture. The method includes a step of disposing a plurality of conductors with the small Nd—Fe—B magnets in the compartment of the roller. The small Nd—Fe—B magnets are mixed with the plurality of conductors in the roller with the roller being rotated of between 5 rpm and 20 rpm.

Abstract: A circuit board with a measure against high frequency noise includes: an interconnect substrate having an interconnect pattern to which an IC which is a source of high frequency noise is electrically connected; a pair of lands provided on a mounting surface of the interconnect substrate; and a chip component having a body composed of a magnetic body (i.e., ferrite) in a rectangular parallelepiped, and a pair of external electrodes provided at opposite ends of the body, the pair of external electrodes being connected to the pair of lands, the body being disposed on the interconnect pattern, as observed in a direction perpendicular to the mounting surface.

Abstract: A method for production of an anisotropic bonded magnet includes: aligning magnetic pole bodies which include an even number of permanent magnets arranged uniformly around an outer periphery of an annular cavity filled with magnetic raw material, aligning magnetic fields to cause rare-earth anisotropic magnet powder to be semi-radially aligned; compressively molding the semi-radially aligned magnet raw material to obtain an annular compact; discharging the compact from the annular cavity; demagnetizing causing the aligning magnetic pole bodies to relatively move only in circumferential direction with respect to the compact after the molding step thereby to apply demagnetization magnetic fields to the compact; The demagnetization magnetic fields are applied from the aligning magnetic pole bodies with opposite poles to those during the alignment step, and the demagnetization magnetic fields are in directions for cancelling the magnetization of the compact caused by the aligning magnetic fields.

Abstract: The present invention relates to ferrite particles for bonded magnet, having a volume-average particle diameter of 2.1 to 2.7 ?m and a particle diameter ×90 of 4.3 to 5.4 ?m wherein the ×90 represents a particle diameter at which a cumulative percentage of particles under sieve (undersize particles) based on a volume thereof is 90%, when determined from a particle size distribution thereof measured by using a laser diffraction type particle size distribution measuring apparatus.

Abstract: An aspect of the present invention relates to a method of manufacturing hexagonal ferrite powder, which comprises preparing a hexagonal ferrite precursor-containing water-based solution by stirring and mixing a reaction solution which comprises an iron salt, an alkaline earth metal salt, and a base in a reaction tank, and removing the hexagonal ferrite precursor-containing water-based solution that has been prepared from the reaction tank and continuously feeding the hexagonal ferrite precursor-containing water-based solution into a reaction flow passage while conducting heating and pressurizing to converting the hexagonal ferrite precursor to hexagonal ferrite, wherein the preparation of the hexagonal ferrite precursor-containing water-based solution comprises a continual feed period during which feeding of the iron salt, the alkaline earth metal salt, and the base into a reaction tank which comprises a prereaction solution in which an iron salt and a base are not both present is continuously or intermittent

Abstract: A magnetic material for antennas including: an M-type hexagonal ferrite represented by the following general formula (1) as a main phase, MA.Fe12-x.MBx.O19 (wherein MA is at least one kind selected from the group consisting of Sr and Ba, MB is MC or MD, MC is at least one kind selected from the group consisting of Al, Cr, Sc and In, MD is an equivalent mixture of at least one kind selected from the group consisting of Ti, Sn and Zr and at least one kind selected from the group consisting of Ni, Zn, Mn, Mg, Cu and Co, X is a number from 1 to 5), and an average crystal particle diameter is equal to or greater than 5 ?m.

Abstract: The method of manufacturing hexagonal ferrite magnetic particles, which includes providing hexagonal ferrite magnetic particles by conducting calcination of particles comprising an alkaline earth metal salt and an iron salt to cause ferritization; and further includes causing a glass component to adhere to the particles and then conducting the calcination of the particles to form a calcined product in which hexagonal ferrite is detected as a principal component in X-ray diffraction analysis; and removing the glass component from a surface of the calcined product that has been formed.

Abstract: An object of the present invention is to provide a ferrite magnetic material capable of providing a permanent magnet in which high Br and HcJ are kept, and which has a high Hk/HcJ. A ferrite magnetic material in accordance with a preferred embodiment has a ferrite phase having a hexagonal structure and has a main composition represented by Ca1-w-x-yRwSrxBayFezMmO19 (R is at least one element of rare earth elements (including Y) essentially including La, and Bi, and M is at least one element of Co, Mn, Mg, Ni, Cu, and Zn essentially including Co), where 0.25<w<0.65, 0.01<x<0.45, 0.0002<y<0.011, y<x, 8<z<11, 1.0<w/m<2.5, and 0.017<m/z<0.065 are satisfied. The total amount of a Si component is 0.1 to 3 mass % based on the amount of the main composition, and respective elements satisfy the relationship of 1.5?[(Ca+R+Sr+Ba)?(Fe+M)/12]/Si?3.5.

Abstract: A ferrite magnet and a ferrite sintered magnet including a ferrite magnetic material are provided. A main phase of the ferrite magnetic material includes a ferrite phase having a hexagonal crystal structure, and metal element composition expressed by Ca1-w-x-yR wSr xBayFezMm wherein 0.25<w<0.5, 0.01<x<0.35, 0.0001<y<0.013, y<x, 8.7<z<9.9, 1.0<w/m<2.1, 0.017<m/z<0.055 and Si component is at least included as a sub-component, and wherein; when content y1 mass % of the Si component in the ferrite magnetic material, with respect to SiO2, is shown on Y-axis and a total content x1 of z and m is shown on X-axis, a relation between x1 and y1 is within a range surrounded by 4 points placed on X-Y coordinate having the X and Y axes.

Abstract: Disclosed herein are a ferrite composition for a high frequency bead in that a part of Fe in M-type hexagonal ferrite represented by BaFe12O19 is substituted with at least one metal selected from a group consisting of 2-valence, 3-valence and 4-valence metals, as well as a chip bead material using the same. According to embodiments of the present invention, the dielectric composition is characterized in that a part of Fe as a constituent of M-type hexagonal barium ferrite is substituted by other metals, to thus decrease a sintering temperature to 920° C. or less without using any additive for low temperature sintering. Moreover, because of high SRF properties, the inventive composition is applicable to a multilayer type chip bead used at a high frequency of more than several hundreds MHz and a magnetic antenna.

Abstract: A method for producing a permanent magnet for a motor, including a step of producing a slurry of a magnet powder, a step of molding the slurry into a sheet form to prepare green sheets of the magnet powder, and a step of alternately laminating the green sheets of the magnet powder and an insulating layer and sintering the laminated plural layers.

Abstract: A feedstock for injection molding includes a ceramic filler that is sinterable to produce a ceramic with a positive temperature coefficient of electrical resistance, a matrix for binding the ceramic filler, the matrix having a melting point lower than a melting point of the ceramic filler, and metallic impurities. A content of the metallic impurities in the feedstock is lower than 10 ppm.

Abstract: Provided is magnetic powder capable of enhancing simultaneously both magnetic characteristics including SNP and durability of a magnetic recording medium. The hexagonal ferrite magnetic powder for a magnetic recording medium has a Ba/Fe molar ratio of 8.0% or more, a Bi/Fe molar ratio of 2.5% or more and an Al/Fe molar ratio of from 3.0 to 6.0%. The magnetic powder preferably has an activation volume Vact of from 1,400 to 1,800 nm3. The magnetic powder particularly preferably has a coercive force Hc of from 159 to 279 kA/m (which is approximately from 2,000 to 3,500 Oe) and a coercivity distribution SFD of from 0.3 to 1.0. The magnetic powder may contain, as an element that substitutes an Fe site of the hexagonal ferrite, at least one kind selected from divalent transition metals M1 and tetravalent transition metals M2.

Abstract: A sintered ferrite magnet having a ferrite phase with a hexagonal structure as the main phase, wherein the composition of the metal elements composing the main phase is represented by the following general formula (1): RxCamA1?x?m(Fe12?yMy)z: ??(1), x, m, y and z in formula (1) satisfying all of the conditions represented by the following formulas (2)-(6): 0.2?x?0.5: ??(2) 0.13?m?0.41: ??(3) 0.7x?m?0.15: ??(4) 0.18?yz?0.31: ??(5) 9.6?12z?11.8: ??(6), and wherein the density of the sintered ferrite magnet is at least 5.05 g/cm3, and the crystal grains of the sintered ferrite magnet satisfy all of the conditions represented by the following formulas (7) and (8), where L ?m is the average for the maximum value and S ?m is the average for the minimum value among the diameters passing through the center of gravity of each grains in the crystal cross-section parallel to the c-axis direction of hexagonal structures. L?0.95: ??(7) 1.8?L/S?2.5: ??(8).

Abstract: A magnetic material of an embodiment includes: first magnetic particles that contain at least one magnetic metal selected from the group including Fe, Co, and Ni, are 1 ?m or greater in particle size, and are 5 to 50 ?m in average particle size; second magnetic particles that contain at least one magnetic metal selected from the group including Fe, Co, and Ni, are smaller than 1 ?m in particle size, and are 5 to 50 nm in average particle size; and an intermediate phase that exists between the first magnetic particles and the second magnetic particles.

Abstract: A magnetizable ink contains at least 65% of magnetizable particles having a modal diameter between 3 ?m and 10 ?m. The particles may have a size distribution with 0% above 18 micron and not greater than 20% under 0.5 micron. The particles may have a surface area less than 50,000 cm2 per cm3, and/or the ink may have a viscosity less than 16,000 cps when ready to print. Where the particles are rounded, magnetically soft iron particles, the surface area may be less than 12,000 cm2 per cm3 and the viscosity may be less than 1,500 cps.

Abstract: An aspect of the present invention relates to a method of manufacturing hexagonal ferrite magnetic powder. The method of manufacturing hexagonal ferrite magnetic powder comprises wet processing hexagonal ferrite magnetic particles obtained following acid treatment in a water-based solvent to prepare an aqueous magnetic liquid satisfying relation (1) relative to an isoelectric point of the hexagonal ferrite magnetic particles: pH0?pH*?2.5, wherein, pH0 denotes the isoelectric point of the hexagonal ferrite magnetic particles and pH* denotes a pH of the aqueous magnetic liquid, which is a value of equal to or greater than 2.0, adding a surface-modifying agent comprising an alkyl group and a functional group that becomes an anionic group in the aqueous magnetic liquid to the aqueous magnetic liquid to subject the hexagonal ferrite magnetic particles to a surface-modifying treatment, and removing the water-based solvent following the surface-modifying treatment to obtain hexagonal ferrite magnetic particles.

Abstract: An object of the present invention is to provide a ferrite magnetic material which can provide a permanent magnet retaining high Br and HcJ as well as having high Hk/HcJ. The ferrite magnetic material according to a preferred embodiment is a ferrite magnetic material formed of hard ferrite, wherein a P content in terms of P2O5 is 0.001% by mass or more.

Abstract: A ferrite sintered magnet has a surface roughness Rz of 3.5 ?m or less. A method for producing a ferrite sintered magnet includes: mixing magnetic powders with at least a binder resin to obtain a magnetic powder mixture; injection molding the magnetic powder mixture inside of a mold having a surface roughness of a surface in contact with the magnetic powder mixture of 2.0 ?m or less with a magnetic field applied to the mold, to obtain a molded body; and sintering the molded body.

Abstract: The invention relates to a modified strontium ferrite of the general chemical formula: Sr1-xLaxFe12-yCoyO19; in which x=y=0.01-1.00 or x=0.15 and y=x/1.6n to =x/2.6n, where n is the Fe2O3:SrO ratio used and may be 5-6. According to the invention, lanthanum and cobalt are added in an amount such that 0.14?x?0.145 and 0.14?y?0.145. The modified strontium ferrite thus prepared has excellent magnetic properties with regard to the remanence BR, the coercive force HCJ and the ratio of HK to HCJ.

Abstract: A hexagonal crystal ferrite magnetic powder having high magnetic characteristics while having a small particle volume and a high specific surface area is provided, and a high-density magnetic recording medium using the powder. A method for producing a hexagonal crystal ferrite formed using a glass crystallization method includes the steps of: mixing a glass matrix with raw materials including iron, bismuth, a divalent metal (M1), a tetravalent metal (M2), any one kind (A) of barium, strontium, calcium, and lead, and at least one kind of rare earth element (represented by R) having a mole equal to or less than that of the iron; heating the mixed raw material to obtain a glass body; quenching the glass body, pulverizing the glass body, and performing a heat treatment, and washing the glass body after the heat treatment with an acid solution.

Abstract: An aspect of the present invention relates to a method of preparing a magnetic particle, which comprises attaching a transition metal-containing organic compound to a surface of a hard magnetic particle and then thermally decomposing the transition metal-containing organic compound to obtain the magnetic particle.

Abstract: The method of manufacturing hexagonal ferrite magnetic particles includes providing hexagonal ferrite magnetic particles by conducting calcination of particles comprising an iron salt and an alkaline earth metal salt to cause ferritization; and further includes preparing the particles comprising an iron salt and an alkaline earth metal salt by adhering a glass component, followed by the alkaline earth metal salt, to the iron salt; and conducting calcination of the particles prepared to form a calcined product in which hexagonal ferrite is detected as a principal component in X-ray diffraction analysis.

Abstract: The present invention relates to ferrite particles for bonded magnet, having a volume-average particle diameter of 2.1 to 2.7 ?m and a particle diameter x90 of 4.3 to 5.4 ?m wherein the x90 represents a particle diameter at which a cumulative percentage of particles under sieve (undersize particles) based on a volume thereof is 90%, when determined from a particle size distribution thereof measured by using a laser diffraction type particle size distribution measuring apparatus.

Abstract: The present invention provides a magnetoelectric material in which an electric property is capable of being controlled by a magnetic field or a magnetic property is capable of being controlled by an electric field, and a method of manufacturing the same. Particularly, the present invention provides a magnetoelectric material in which a distance between magnetic ions interacting with each other is controlled by using non-magnetic ions or alkaline earth metal ions, and a method of manufacturing the same.

Abstract: Embodiments disclosed herein include methods of modifying synthetic garnets used in RF applications to reduce or eliminate Yttrium or other rare earth metals in the garnets without adversely affecting the magnetic properties of the material. Some embodiments include substituting Bismuth for some of the Yttrium on the dodecahedral sites and introducing one or more high valency ions to the octahedral and tetrahedral sites. Calcium may also be added to the dodecahedral sites for valency compensation induced by the high valency ions, which could effectively displace all or most of the Yttrium (Y) in microwave device garnets. The modified synthetic garnets with substituted Yttrium (Y) can be used in various microwave magnetic devices such as circulators, isolators and resonators.

Abstract: Disclosed is a MnZnCo-based ferrite consisting of base constituents, accessory constituents, and inevitable impurities, which MnZnCo-based ferrite is characterized by adding silicon oxide (SiO2 conversion): 50-400 mass ppm and calcium oxide (CaO conversion): 1000-4000 mass ppm as secondary constituents to base constituents consisting of iron oxide (Fe2O3 conversion): 51.0-53.0 mol %, zinc oxide (ZnO conversion): greater than 12.0 mol % and less than 18.0 mol %, cobalt oxide (CoO conversion): 0.04-0.60 mol %, and manganese oxide (MnO conversion): remainder, and keeping phosphorus, boron, sulfur, and chlorine of the inevitable impurities to phosphorous: less than 3 mass ppm, boron: less than 3 mass ppm, sulfur: less than 5 mass ppm, and chlorine: less than 10 mass ppm. This MnZnCo-based ferrite has the superior characteristics of always having incremental permeability [mu]? of 2000 or greater across a wide temperature range of ?40 DEG C. to 85 DEG C.

Abstract: The hot-melt adhesive composition contains a hot-melt adhesive, a ferromagnetic substance, and a foaming agent that foams when heated, and the hot-melt adhesive composition has: a surface magnetic force of 20 mT or more; a surface magnetic force after heating for adhesion of 5 mT or less; and a volume change ratio due to heating for adhesion of 110% to 400%. The hot-melt adhesive composition may be formed into a sheet-like shape to provide a hot-melt adhesive sheet, which exhibits an excellent adhesive force by heating and which also exhibits a sufficient temporarily fixing force due to magnetic force at the initial stage, but the magnetic force is sufficiently reduced after heating, so that the occurrence of irregularity on the surface due to magnetic force lines after heating can be suppressed.

Abstract: A ferrite magnet and a ferrite sintered magnet including a ferrite magnetic material are provided. A main phase of the ferrite magnetic material includes a ferrite phase having a hexagonal crystal structure, and metal element composition expressed by Ca1-w-x-yR wSr xBayFezMm wherein 0.25<w<0.5, 0.01<x<0.35, 0.0001<y<0.013, y<x, 8.7<z<9.9, 1.0<w/m<2.1, 0.017<m/z<0.055 and Si component is at least included as a sub-component, and wherein; when content y1 mass % of the Si component in the ferrite magnetic material, with respect to SiO2, is shown on Y-axis and a total content x1 of z and m is shown on X-axis, a relation between x1 and y1 is within a range surrounded by 4 points placed on X-Y coordinate having the X and Y axes.

Abstract: A ferrite material and an electronic component which employs sintered ferrite formed from the ferrite material. The ferrite material is obtained by adding, as minor ingredients, 0.06-0.50 parts by weight of bismuth oxide in terms of Bi2O3, 0.11-0.90 parts by weight of titanium oxide in terms of TiO2, and 0.06-0.46 parts by weight of barium oxide in terms of BaO to a ferrite powder comprising iron oxide, copper oxide, zinc oxide, and nickel oxide as major ingredients. The weight ratio among the bismuth oxide, the titanium oxide, and the barium oxide is as follows: when the proportion of the bismuth oxide in terms of Bi2O3 is taken as 1.00, then the proportion of the titanium oxide in terms of TiO2 is 1.08-2.72 and that of the barium oxide in terms of BaO is 0.72-1.20.

Abstract: A method of making Y-type hexagonal ferrite and an antenna using the same are provided. Y-type hexagonal ferrite includes a base ferrite composed of iron oxide, barium carbonate and cobalt oxide, and silicate glass ranging from 0.5 to 5 weight percent added to 100 weight percent of base ferrite. An antenna apparatus includes a magnetic carrier and an antenna pattern formed thereon. The magnetic carrier is formed of such Y-type hexagonal ferrite, and the antenna pattern resonates in a specific frequency band when electric power is supplied. To fabricate the Y-type hexagonal ferrite, a calcination process is performed in which iron oxide, barium carbonate and cobalt oxide are combined into base ferrite at a given calcination temperature after being mixed. A sintering process is performed to sinter the base ferrite and the silicate glass at a given sintering temperature which is lower than the calcination temperature after adding the silicate glass to the base ferrite.

Abstract: An aspect of the present invention relates to a method of manufacturing a hexagonal ferrite magnetic particle comprising melting an Al-containing starting material mixture to prepare a melt and quenching the melt to obtain an amorphous material; subjecting the amorphous material to heat treatment to cause a hexagonal ferrite magnetic particle to precipitate in a product obtained by the heat treatment; collecting a hexagonal ferrite magnetic particle by subjecting the product to treatment with an acid and washing, wherein the hexagonal ferrite magnetic particle collected has a particle size ranging from 15 to 30 nm, comprises 0.6 to 8.0 weight percent of Al, based on Al2O3 conversion, relative to a total weight of the particle, and Al adheres to a surface of the hexagonal ferrite magnetic particle.

Abstract: The present invention relates to black magnetic iron oxide particles comprising magnetite as a main component, wherein when the black magnetic iron oxide particles are molded into a tablet shape, an electric resistance value of the tablet in an alternating current electric field is controlled to produce an impedance of not less than 2×106 ?cm as measured in a characteristic frequency range thereof. The black magnetic iron oxide particles according to the present invention can provide a toner capable of exhibiting a good charging performance and a uniform charging property under the high-temperature and high-humidity conditions, so that when developing an electrostatic latent image therewith, it is possible to obtain toner images having a high resolution or definition, and further the use of heavy metal elements in the black magnetic iron oxide particles can be minimized.

Abstract: An aspect of the present invention relates to a magnetic particle obtained by heat-treating a hexagonal ferrite magnetic material in reducing atmosphere containing hydrocarbon gas.

Abstract: A Mn—Zn—Co ferrite core includes a basic component, sub-components, and unavoidable impurities. As the sub-components, silicon oxide (in terms of SiO2): 50-400 mass ppm and calcium oxide (in terms of CaO): 1000-4000 mass ppm are added to the basic component consisting of iron oxide (in terms of Fe2O3): 51.0-53.0 mol %, zinc oxide (in terms of ZnO): more than 12.0 mol % and 18.0 mol % or less, cobalt oxide (in terms of CoO): 0.04-0.60 mol %, and manganese oxide (in terms of MnO): balance; Phosphorus, boron, sulfur, and chlorine in the unavoidable impurities are reduced as follows, phosphorus: less than 3 mass ppm, boron: less than 3 mass ppm, sulfur: less than 5 mass ppm, and chlorine: less than 10 mass ppm; and a ratio of a measured specific surface of the Mn—Zn—Co ferrite core to an ideal specific surface of the Mn—Zn—Co ferrite core satisfies: Measured specific surface/ideal specific surface <1500.

Abstract: A method for producing a sintered ferrite magnet having an M-type ferrite structure and represented by: Ca1?x?yRxBayFe2n-zCoz, (by atomic ratio), where 0.3?1?x?y?0.65, 0.2?x?0.65, 0.001?y?0.2, 0.03?z?0.65, 4?n?7, and 1?x?y>y. The method includes mixing a Ca compound, an R element compound, a Ba compound, an iron compound and a Co compound as starting materials; calcining the starting materials to obtain calcined bodies; pulverizing the calcined bodies to obtain a calcined powder; providing recycled materials having an M-type ferrite structure and being represented by the above formula; pulverizing the recycled materials to obtain a recycled material powder; mixing the recycled material powder with the calcined powder to form a moldable material; molding the moldable material to obtain green bodies; and sintering the green bodies to obtain the sintered ferrite magnet.

Abstract: A sintered ferrite magnet comprising a first granular ferrite compound phase containing Ca, La, Fe and Co and having a Curie temperature Tc1 between 415° C. and 430° C., and a second granular ferrite compound phase containing Sr, La, Fe and Co and having a Curie temperature Tc2 between 437° C. and 455° C., the volume ratio of the first ferrite compound phase being 50-90%, and the volume ratio of the second ferrite compound phase being 10-50%, with their total volume ratio being 95% or more.