Magnetizable abrasive particles are described comprising ceramic particles having outer surfaces comprising a coating of unsintered polyion and magnetic particles bonded to the polyion. In favored embodiments, the magnetic particles have a magnetic saturation of at least 10, 15, 20, 25, 30, 35, 40, 45 or 50 emu/gram. In another embodiment, an abrasive article is described comprising a plurality of magnetizable abrasive particles as described herein retained in a binder material. Also described are method of making magnetizable abrasive particles and methods of making an abrasive article comprising magnetizable abrasive particles.

In an aspect, a ferrite composition comprises a Ru—Co.sub.2Z ferrite having the formula: (Ba.sub.3-xM.sub.x)Co.sub.2(M′Ru).sub.yFe.sub.24-2y-zO.sub.41, wherein M is at least one of Sr, Pb, or Ca; M′ is at least one of Co, Zn, Mg, or Cu; x is 1 to 3; y is greater than 0 to 2; and z is −4 to 4. In another aspect, an article comprises the ferrite composition. In yet another aspect, method of making the ferrite composition comprises mixing ferrite precursor compounds comprising Fe, Ba, Co, and Ru; and sintering the ferrite precursor compounds in an oxygen atmosphere to form the Ru—Co.sub.2Z ferrite.

In an aspect, a ferrite composition comprises a Ru—Co.sub.2Z ferrite having the formula: (Ba.sub.3-xM.sub.x)Co.sub.2(M′Ru).sub.yFe.sub.24-2y-zO.sub.41, wherein M is at least one of Sr, Pb, or Ca; M′ is at least one of Co, Zn, Mg, or Cu; x is 1 to 3; y is greater than 0 to 2; and z is −4 to 4. In another aspect, an article comprises the ferrite composition. In yet another aspect, method of making the ferrite composition comprises mixing ferrite precursor compounds comprising Fe, Ba, Co, and Ru; and sintering the ferrite precursor compounds in an oxygen atmosphere to form the Ru—Co.sub.2Z ferrite.

In an aspect, a composition comprises a plurality of magnetic particles. The magnetic particles each independently comprise a nickel ferrite core having the formula Ni.sub.1−xM.sub.xPe.sub.2+yO.sub.4, wherein M is at least one of Zn, Mg, Co, Cu, Al, Mn, or Cr; x is 0 to 0.95, and y=−0.5 to 0.5; and an iron nickel shell at least partially surrounding the core, wherein the iron nickel shell comprises iron, nickel, and optionally M. In another aspect, a method of forming the magnetic particles comprises heat treating a plurality of nickel ferrite particles in a hydrogen atmosphere to form the plurality of magnetic particles having the iron nickel shell on the nickel ferrite core. In yet another aspect, a composite can comprise the magnetic particles and a polymer.

An inductor component includes a multilayer body including a magnetic layer and a spiral wiring line disposed in the multilayer body. The magnetic layer includes a base resin, a metal magnetic powder, and a non-magnetic powder. The base resin has voids, and the metal magnetic powder and the non-magnetic powder are contained in the base resin. There is a particle of the metal magnetic powder that is in contact with at least one of the voids and with the non-magnetic powder.

An inductor component includes a multilayer body including a magnetic layer and a spiral wiring line disposed in the multilayer body. The magnetic layer includes a base resin, a metal magnetic powder, and a non-magnetic powder. The base resin has voids, and the metal magnetic powder and the non-magnetic powder are contained in the base resin. There is a particle of the metal magnetic powder that is in contact with at least one of the voids and with the non-magnetic powder.

An object of the present invention is to provide a composition that can form a magnetic particle-containing film having excellent magnetic isotropy and has excellent temporal stability. Another object of the present invention is to provide a magnetic particle-containing film that relates to the composition, and an electronic component that includes the magnetic particle-containing film.

The composition according to an embodiment of the present invention is a composition containing magnetic particles and a rheology control agent, in which a content of the magnetic particles having an aspect ratio less than 8 is 25% by mass or more with respect to a total mass of the magnetic particles, the magnetic particles contain metal atoms, the metal atoms contain one or more kinds of specific atoms selected from the group consisting of Ni atoms and Co atoms, and a content of the specific atoms is 50% by mass or more with respect to a total mass of the metal atoms.

A soft magnetic composition that includes an oxide containing a W-type hexagonal ferrite having a compositional formula of ACaMe.sub.2Fe.sub.16O.sub.27 as a main phase, wherein A is one or more selected from Ba, Sr, Na, K, La, and Bi at 4.7 mol % to 5.8 mol %; Me is one or more selected from Co, Cu, Mg, Mn, Ni, and Zn at 9.4 mol % to 18.1 mol %, the Ca is 0.2 mol % to 5.0 mol %, the Fe is 67.4 mol % to 84.5 mol %, and the soft magnetic composition has a coercivity Hcj of 100 kA/m or less.

A first object of the present invention is to provide a composition that contains electromagnetic wave absorbing particles and has excellent dispersion stability. A second object of the present invention is to provide a film and a cured film that are formed using the aforementioned composition and a manufacturing method of a cured film. A third object of the present invention is to provide an electronic component including a cured film formed using the aforementioned composition.

The composition according to an aspect of the present invention contains electromagnetic wave absorbing particles, a dispersant, and a solvent.

The composition absorbs electromagnetic waves in a frequency band of 1 GHz or higher when formed into a film.

A magnetic body, a curable composition comprising the same, and a method for manufacturing the same are disclosed herein. In some embodiments, a magnetic body includes magnetic particles, and a surface treatment agent bonded to the surface of the magnetic particles, wherein the magnetic particles comprise crystals having a size in a range of 10 nm to 40 nm, wherein the magnetic particles have an average particle diameter in a range of 20 nm to 300 nm, and wherein the magnetic particles have a particle diameter variation coefficient in a range of 5% to 30%. The magnetic body may have an excellent calorific value, and at the same time, may maintain the calorific value uniformly. In the magnetic body, the calorific value characteristics may be freely adjusted. The curable composition of the present application can be easily cured by using a magnetic body that satisfies all the characteristics.