Patent ID: 8491728

Claim:
A manufacturing method of a Nd—Fe—B based permanent magnet comprising steps of milling magnet material into magnet powder; adding an organometallic compound expressed with a structural formula of M-(OR) x , M representing V, Mo, Zr, Ta, Ti, W or Nb, R representing an alkyl group in a form of a straight-chain or branched-chain, and x representing an arbitrary integer, to the magnet powder obtained at the step of milling magnet material and getting the organometallic compound adhered to particle surfaces of the magnet powder; compacting the magnet powder of which particle surfaces have got adhesion of the organometallic compound so as to obtain a compact body; calcining the compact body in a hydrogen atmosphere to obtain a calcined body; and sintering the calcined body, wherein, in the step of calcining the compact body, R in the structural formula is removed by thermally decomposing the organometallic compound contained in the compact body so that a residual carbon content contained in the Nd—Fe—B permanent magnet thus manufactured is higher than 0 wt % and 0.15 wt % or less, and wherein the permanent magnet is Nd—Fe—B based.