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.

A receiving antenna of a wireless power receiving apparatus for wireless power charging according to one embodiment of the present invention comprises: a substrate; a soft magnetic layer disposed on the substrate; and a receiving coil which is wound in parallel with a plane of the soft magnetic layer and is embedded on one surface of the soft magnetic layer, wherein at least one surface of the receiving coil is slantly embedded on the one surface of the soft magnetic layer.

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.

A receiving antenna of a wireless power receiving apparatus for wireless power charging according to one embodiment of the present invention comprises: a substrate; a soft magnetic layer disposed on the substrate; and a receiving coil which is wound in parallel with a plane of the soft magnetic layer and is embedded on one surface of the soft magnetic layer, wherein at least one surface of the receiving coil is slantly embedded on the one surface of the soft magnetic layer.

Provided is a grain-oriented electrical steel sheet with good film adhesion. Among the elements present at grain boundaries between ceramic particles contained in a base film of the grain-oriented electrical steel sheet, either or both of S and Se elements are contained in a range of 0.02 at % to 2.00 at %.