LOW-B RARE EARTH MAGNET

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Disclosed is a low-B rare earth magnet. The rare earth magnet contains a main phase of R2T14B, and comprises the following raw material components : 13.5 at%-14.5 at% of R, 5.2 at%-5.8 at% of B, 0.3 at%-0.8 at% of Cu, 0.3 at%-3 at% of Co, and the balance being T and inevitable impurities, the R being at least one rare earth element comprising Nd, and the T being an element mainly comprising Fe. 0.3-0.8 at% of Cu and an appropriate amount of Co are added to the rare earth magnet by compositing, so that three Cu-rich phases are formed in the grain boundary, and the magnetic effect of the three Cu-rich phases existing in the grain boundary and the solving of the problem of insufficient B in the grain boundary can obviously improve the squareness and heat-resistance of the magnet.