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Ce-based RFeB (R= rare-earth) nano-structured permanent magnets consisting of (Ce,Nd)FeB core-shell grains separated by a non-magnetic grain boundary phase, in which the relative amount of Nd to Ce is higher in the shell of the magnetic grain than in its core, were fabricated by Nd-Cu infiltration into (Ce,Nd)FeB hot-deformed magnets. The coercivity values of infiltrated core-shell structured magnets are superior to those of as-hot-deformed magnets with the same overall Nd content. This is attributed to the higher value of magnetocrystallineanisotropy of the shell phase in the core-shell structured infiltrated magnets compared to the homogeneous RFeB grains of the as-hot-deformed magnets, and to magnetic isolation of RFeB grains by the infiltrated grain boundary phase. First order reversal curve (FORC) diagrams suggest that the higher anisotropy shell suppresses initial magnetization reversal at the edges and corners of the RFeB grains.


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