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

The invention relates to a method for producing a magnet material, a method for producing a rotor of an electric motor, a method for producing an electric motor and a magnet material. The method for producing a magnet material has: a demagnetization step of heating a shaped permanent magnet in the presence of a reducing substance having a stronger reducibility than nitrogen molecules, the permanent magnet being irreversibly demagnetized by thermal demagnetization; and a cooling step of cooling the demagnetized permanent magnet to manufacture a molded magnet material. A magnet material having a thickness of 30 [mu] m or more contains a rare earth element and a transition metal element as main components. In the magnet material, the ratio of (b) the carbon concentration in a surface layer region, which is a region within 10 [mu] m from the surface of the magnet material, to (a) the carbon concentration in an inner region, which is a region provided at a position 10 [mu] m beyond the surface of the magnet materi