There is provided a radio wave absorbing composition containing a magnetic powder and a binder. There is also provided a radio wave absorber containing a magnetic powder and a binder. The magnetic powder is a powder of a substitution-type hexagonal ferrite subjected to surface treatment with a surface treatment agent, the surface treatment agent is a silicon-based compound, and the binder is an olefin-based resin.

The present disclosure relates to a magnetic heating element, an induction heating-type adhesive including the same, and a method of preparing the magnetic heating element. The magnetic heating element according to an embodiment of the present disclosure has a composition with an atomic ratio represented by the following formula, (Ma1-x-yMbxFey)1Fe2-zMczO4, wherein: Ma is cobalt (Co), Mb is one or more of zinc (Zn), Copper (Cu), Manganese (Mn), and Magnesium (Mg), and Mc is one or more of samarium (Sm), yttrium (Y), cerium (Ce), europium (Eu), neodymium (Nd), and dysprosium (Dy); 0.01≤x<0.6, 0≤y≤0.4, x+y<1, 0≤z≤0.5; and the magnetic heating element has a grain size of 40 nm to 500 nm, and powder of the magnetic heating element has a particle size of 100 nm to 30 μm. Accordingly, the adhesive including the magnetic heating element may improve adhesive performance and provide high-speed bonding.

A magnetic micro-particle (201) comprising one or more magnetic nano-wires (202).

A magnetic micro-particle (201) comprising one or more magnetic nano-wires (202).

To provide magnetoplumbite-type hexagonal ferrite particles represented by Formula (1) and having a single crystal phase, and the application. In Formula (1), A represents at least one metal element selected from the group consisting of Sr, Ba, Ca, and Pb, and x satisfies 1.5≤x≤8.0.
AFe.sub.(12−x)Al.sub.xO.sub.19  Formula (1)

The present invention provides a recording method and a recording device in which information can be easily recorded even in a magnetic recording medium using epsilon iron oxide particles having a high coercive force as a magnetic recording material. A recording device of the invention applies an external magnetic field H.sub.0 that inclines magnetization of epsilon iron oxide particles to a particle dispersion element containing epsilon iron oxide particles, and irradiates the particle dispersion element with light that excites the magnetization. Accordingly, the recording device is capable of inverting magnetization that is not capable of being inverted only by the external magnetic field, in accordance with a synergetic effect between the inclination of the magnetization and the light excitation of the magnetization.

A magnet structure is a magnet structure for a TMR element which is an MR element. The magnet structure includes a bonded magnet compact that has a first main surface facing the TMR element, and a second main surface on a side opposite to the first main surface; and a tubular member that supports the bonded magnet compact. The bonded magnet compact has a gate portion which is provided on the second main surface and includes a gate mark formed by performing injection molding. The gate portion is provided at a position overlapping a center on the second main surface when seen from the second main surface side.

The magnetic tape includes a non-magnetic support; a magnetic layer including ferromagnetic powder and a binding agent on one surface side of the non-magnetic support; and a back coating layer including non-magnetic powder and a binding agent on the other surface side of the non-magnetic support, in which an isoelectric point of a surface zeta potential of the magnetic layer is equal to or smaller than 3.8, and an isoelectric point of a surface zeta potential of the back coating layer is equal to or smaller than 3.0, a magnetic tape cartridge, and a magnetic tape apparatus including this magnetic tape.

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 R.sub.1-xA.sub.xFe.sub.m-yCo.sub.y, 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 B.sub.2O.sub.3.

0.2≤x≤0.8  (1)

0.1≤y≤0.65  (2)

3≤m≤14  (3)

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 R.sub.1-xA.sub.xFe.sub.m-yCo.sub.y, 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 B.sub.2O.sub.3.

0.2≤x≤0.8  (1)

0.1≤y≤0.65  (2)

3≤m≤14  (3)