RARE-EARTH PERMANENT MAGNETIC POWDERS, BONDED MAGNET COMPRISING SAME, AND DEVICE USING BONDED MAGN

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Disclosed are rare-earth permanent magnetic powders, a bonded magnet comprising same, and a device using the bonded magnet. The rare-earth permanent magnetic powders comprise a 70-99vol% hard magnetic phase and a 1-30vol% soft magnetic phase. The hard magnetic phase has a TbCu7 structure, and has a crystal grain size of 5-100nm. The soft magnetic phase is an Fe phase with a bcc structure. An average crystal grain size of the soft magnetic phase is 1-30nm, and a standard deviation of the grain size is less than 0.5σ. The rare-earth permanent magnetic powders are mainly dual-phase magnet powders with combined soft and hard magnetic phases, that is, the hard magnetic phase with the TbCu7 structure and the soft magnetic phase with an α-Fe structure. The dual-phase magnetic powders have a uniform microstructure and can ensure uniform coupling of the hard magnetic phase and the software magnetic phase, thereby improving the magnetic performance.