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Effective grain interface modification was conducted to increase the coercivity of Nd–Fe–B sintered magnets without degrading their magnetic properties seriously. The surface of magnet pieces (3.0 × 3.0 × 2.8 mm 3 ) was uniformly coated with a Dy or Tb metal film, and then each metal was introduced inside the magnets through the Nd-rich grain boundary regions for enriching them on the surface around the Nd 2 Fe 14 B grain particles. The coercivities of the Dy- and Tb-metal-treated magnets ( H cJ = 1.45 and 1.81 MA/m, respectively) were considerably improved compared with that of the untreated magnet ( H cJ = 0.98 MA/m), suggesting that the aligned magnetic domain structure was effectively stabilized by such a Dy- or Tb-enriched interface around the Nd 2 Fe 14 B grain particles.
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Li et al. (2008) studied this question.
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