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Anisotropic exchange in Nd–Fe–B permanent magnets

机译:Nd-Fe-B永磁体中的各向异性交换

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The exchange is critical for designing high-performance Nd–Fe–B permanent magnets. Here we demonstrate through multiscale simulations that the exchange in Nd–Fe–B magnets, including bulk exchange stiffness (A _(e)) in Nd_(2)Fe_(14)B phase and interface exchange coupling strength ( J i n t ) between Nd_(2)Fe_(14)B and grain boundary (GB), is strongly anisotropic. A _(e) is larger along crystallographic a /b axis than along c axis. Even when the GB Fe_(x)Nd_(1–x ) has the same composition, J i n t for (100) interface is much higher than that for (001) interface. The discovered anisotropic exchange is shown to have profound influence on the coercivity. These findings enable more freedom in designing Nd–Fe–B magnets by tuning exchange.
机译:交流对于设计高性能Nd-Fe-B永磁体至关重要。在这里,我们通过多尺度模拟证明了Nd–Fe–B磁体中的交换,包括Nd_(2)Fe_(14)B相中的整体交换刚度( A _(e))和界面交换耦合强度(J int Nd_(2)Fe_(14)B和晶界(GB)之间的)是强烈各向异性的。沿晶体学a / b轴的A _(e)大于沿c c轴的A _(e)。即使GB Fe_(x)Nd_(1-x)具有相同的成分,(100)界面的J int也远高于(001)界面的。已发现发现的各向异性交换对矫顽力具有深远的影响。这些发现为通过调谐交换设计Nd-Fe-B磁体提供了更大的自由度。

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