Method of producing magnet material, method of producing rotor of electric motor, method of producing electric motor, and magnet material

Abstract

A magnet material producing method includes demagnetizing, by thermal demagnetization in an irreversible manner, a molded permanent magnet, by heating the permanent magnet in a presence of a reducing substance having a reducing property stronger than nitrogen molecules, and cooling the demagnetized permanent magnet to create a molded magnet material. A magnet material with a thickness of 30 μm or more contains, as main components, a rare earth element and a transition metal element. In the above described magnet material, a ratio of (b) a carbon concentration in a surface layer region that is a region within 10 μm from a surface of the magnet material to (a) a carbon concentration in an interior region that is a region arranged in a position away from the surface of the magnet material by more than 10 μm and having a thickness of 10 μm is 1.1 or more.

Dependencies are inferred from the claim text.