Core-shell particle and manufacturing method and fired product of the same, epsilon type iron oxide compound particle and manufacturing method of the same, and magnetic recording medium and manufacturing method of the same

A method of manufacturing an epsilon type iron oxide compound particle, comprising:

• forming a core-shell particle according to a method of manufacturing a core-shell particle;
• firing the core-shell particle;
• and
• removing the shell of the core-shell particle,
• wherein the method of manufacturing a core-shell particle comprises:
• emulsifying a core component by adding the core component into an organic solvent comprising a surfactant, the core component comprising an iron oxyhydroxide compound represented by the following Formula (3-1) or at least one iron oxide compound selected from the group consisting of Fe2O3, a compound represented by the following Formula (1-1), and a compound represented by the following Formula (2-1);
• and
• coating the emulsified core component with a shell comprising a polycondensate of a metal alkoxide,
• A1a1Fe2-a1O3 (1-1)
• wherein, in Formula (1-1), A1 represents at least one metal element other than Fe, and a1 satisfies a relationship of 0<a1<2;
• A2a2Fe3-a2O4 (2-1)
• wherein, in Formula (2-1), A2 represents at least one metal element other than Fe, and a2 satisfies a relationship of 0<a2<2;
• and
• A3a3Fe1-a3OOH (3-1)
• wherein, in Formula (3-1), A3 represents at least one metal element other than Fe, and a3 satisfies a relationship of 0<a3<1, and
• wherein one core-shell particle is formed per one core.