PRODUCTION METHOD OF RARE EARTH-IRON-BASED ALLOY MATERIAL, RARE EARTH-IRON-BASED ALLOY MATERIAL, P

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PROBLEM TO BE SOLVED : To provide a production method of a rare earth-iron-based alloy material capable of producing the homogeneous thin belt of a rare earth-iron-based alloy which does not contain an α-Fe phase by suppressing the formation of the α-Fe phase.SOLUTION : A production method of a rare earth-iron-based alloy material comprises : a molten metal preparation step to prepare molten metal 1 containing a rare earth element and iron; and a rapid cooling and solidifying step to produce the thin belt 10 of a rare earth-iron-based alloy by rapidly cooling and solidifying the molten metal poured on the surface of a cooled rotary roll 130. The width of the thin belt 10 is 120 mm or more and 250 mm or less and the surface roughness of the rotary roll 130 is 5 μm or less as ten-point average roughness (Rz).