Rare earth magnet precursor or rare earth magnet molded body having rough surface structure and its manufacturing method

摘要

Rare earth magnet precursors having a roughened structure on the surface or rare earth magnet molded bodies having a roughened structure on the surface and methods for producing them are provided, and the following (a) to ( c): (a) Sa (arithmetic average height) (ISO 25178) is 5 to 300 μm (b) Sz (maximum height) (ISO 25178) is 50 to 1500 μm (c) Sdr (expanded area ratio of interface) ( Provided is a rare earth magnet precursor or a rare earth magnet molded body in which an unevenness is formed in which ISO 25178) satisfies at least one of 0.3 to 12.