The present invention can homogenize the spacing, size, orientation, shape, etc. of the R-rich region and the 2-14-1 phase dendrite, suppresses the generation of chill crystals, and prepares rare earth sintered magnets. A method for producing an alloy slab for a rare earth sintered magnet, which can be easily pulverized to a uniform particle size in the pulverization step and can control the reduction ratio of the pulverized alloy powder compact, and an alloy for a rare earth sintered magnet obtained by the method A rare earth sintered magnet having excellent slab and magnetic properties is provided. The production method of the present invention includes a step of preparing a molten alloy having a composition composed of the balance M including R, B and Fe such as rare earth metal elements, and linear solidified nucleation that suppresses the formation of dendrites and the like on the roll surface. A step of supplying the molten alloy to a cooling roll having a plurality of suppressing portions and a plurality of solidification nucleation generating portions for generating dendrites, and having a region where the line width of the solidification nucleation suppressing portions is larger than 100 μm, and cooling and solidifying. including.
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