SINTERED BODY OF RARE-EARTH MAGNET PRECURSOR, AND MANUFACTURING METHOD FOR FINE MAGNETIC POWDER FOR

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Provided are a sintered body for a rare-earth magnet exhibiting a high degree of orientation and high remanent magnetization, and a manufacturing method for a fine magnetic powder for forming the sintered body. The sintered body (S), which comprises nano-crystalline Nd-Fe-B main phase crystal grains (g2) and a grain-boundary phase around the main phase, is subjected to hot plastic working to impart anisotropy to the sintered body (S), and an alloy for improving coercivity is diffused therein. In the sintered body, which is the precursor for a rare earth magnet, the planar shape, as viewed from a direction perpendicular to the direction of easy magnetization (c-axis direction), of the crystal grains (g2) forming the sintered body (S) is a rectangle, or a shape approximating the same, comprising sides in the c-axis direction and sides in a direction perpendicular thereto (a-axis direction).