An iron-based oxide magnetic particle powder has a narrow particle size distribution a small content of fine particles that do not contribute to magnetic recording characteristics, and a narrow coercive force distribution, to enhance magnetic recording medium density. Neutralizing an aqueous solution containing a trivalent iron ion and an ion of the metal substituting a part of the Fe sites by adding an alkali to make pH of 1.5 or more and 2.5 or less, adding a hydroxycarboxylic acid, and further neutralizing by adding an alkali to make pH of 8.0 or more and 9.0 or less are performed at 5° C. or more and 25° C. or less. A formed iron oxyhydroxide precipitate containing the substituting metal element is rinsed with water, then coated with silicon oxide, and then heated thereby providing e-type iron-based oxide magnetic particle powder. The rinsed precipitate may be subjected to a hydrothermal treatment.

This ferrite magnet has a magnetoplumbite structure and is characterized in that, when representing the composition ratios of the total of each metal element A, R, Fe and Me with expression (1) A.sub.1-xR.sub.x(Fe.sub.12-yMe.sub.y).sub.z, the Fe.sup.2+ content (m) in the ferrite magnet is greater than 0.1 mass % and less than 5.4 mass % (in expression (1), A is at least one element selected from Sr, Ba, Ca and Pb; R is at least one element selected from the rare-earth elements (including Y) and Bi, and includes at least La, and Me is Co, or Co and Zn). The invention makes it possible to achieve a ferrite magnet with increased Br.

A core-shell particle includes: a core including an iron oxyhydroxide compound represented by Formula A.sup.3.sub.a3Fe.sub.1−a3OOH (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.2−a1O.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.3−a2O.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.

Disclosed herein are embodiments of low temperature co-fireable dielectric materials which can be used in conjunction with high dielectric materials to form composite structures, in particular for isolators and circulators for radiofrequency components. Embodiments of the low temperature co-fireable dielectric materials can be scheelite or garnet structures, for example, bismuth vanadate. Adhesives and/or glue is not necessary for the formation of the isolators and circulators.

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.

A coupling inductor includes a core having a central section and an outer section, a first coil wound around the central section between a first end and a center portion of the central section, a second coil wound in a direction opposite to that of the first coil around the central section between the first end and the center portion of the central section, a third coil connected to the first coil and wound in a same direction as that of the first coil around the central section between a second end and the center portion of the central section, and a fourth coil connected to the second coil and wound around the central section between the second end and the center portion of the central section, wherein the fourth coil is wound in a direction opposite to the direction in which the first coil is wound.

An exemplary embodiment of the present invention provides a stylus pen including: a body; a conductive tip configured to be exposed from an inside of the body to an outside thereof; and a resonance circuit connected to the conductive tip to resonate an electrical signal transferred from the conductive tip. An inductor unit of the resonance circuit includes a ferrite core and a coil wound in multiple layers over at least a portion of the ferrite core. The ferrite core includes nickel, and the coil can be formed by a litz wire with adjacent winding layers that are wound to be inclined in a zigzag form.

A ferrite sintered magnet 100 comprises M-type ferrite crystal grains 4 and multiple-crystal grain boundaries 6b surrounded by three or more of the M-type ferrite crystal grains 4. The ferrite sintered magnet 100 contains at least Fe, Ca, B, and Si, and contains 0.005 to 0.9 mass % of B in terms of B.sub.2O.sub.3. The multiple-crystal grain boundaries 6b contain Si and Ca, and in a case where the molar ratio of Ca to Si in the multiple-crystal grain boundaries 6b is represented by (Ca/Si).sub.G, the following formula is satisfied.
0.1<(Ca/Si).sub.G<0.9

The present invention provides a POSS-containing in-situ composite nanogel with magnetic responsiveness and the method for preparing the same, wherein POSS-containing macromolecule capable of polymerizing and metal-coordination complexing is synthesized to complex with iron salt, Fe.sup.2+/Fe.sup.3+ salts are in-situ deposited via chemical coprecipitation, and crosslinking agent and initiator are added to induce polymerization so that POSS-containing nanogel ranges with magnetic responsiveness is obtained. The present invention is of professional design, feasible technique and simple operation, and prepared nanogel magnetic particles are well dispersed with excellent magnetic responsiveness, which possesses a good application prospect in medical diagnosis, sensor, catalyst carrier and biomaterial.

A ferrite powder for bonded magnets capable of producing a ferrite bonded magnet having high BH.sub.max, and excellent in fluidity when converted to a compound, and having a high p-iHc value, and a method for producing the same, and a ferrite bonded magnet using the ferrite powder for bonded magnets, wherein an average particle size of particles obtained by a dry laser diffraction measurement is 5 μm or less; a specific surface area is 1.90 m.sup.2/g or more and less than 2.80 m.sup.2/g; a compression density is 3.50 g/cm.sup.3 or more and less than 3.78 g/cm.sup.3, and a compressed molding has a coercive force of 2300 Oe or more and less than 2800 Oe.