Abstract
We have investigated the effect of lattice disorders near the surface of hard magnetic Nd 2Fe 14B grains on coercivity using artificial interfaces created by sputter depositing Nd on polished surface of Nd–Fe–B sintered magnets. The interfacial structure was manipulated by annealing the coated samples at 550 °C in vacuum with and without Ta cap. Nano-beam electron diffraction revealed a few nm thick disordered layer within the Nd 2Fe 14B phase at the Nd/Nd 2Fe 14B interface of a low coercivity sample, while a high coercivity sample showed a well-defined crystal structure of Nd 2Fe 14B near the NdO x /Nd 2Fe 14B interface.
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