论文标题
自旋波分散和交换刚度ND $ _2 $ fe $ _ {14} $ b和$ r $ fe $ _ {11} $ ti（$ r $ = y，nd，sm）从第一原理计算
Spin-wave dispersion and exchange stiffness in Nd$_2$Fe$_{14}$B and $R$Fe$_{11}$Ti ($R$=Y, Nd, Sm) from first-principles calculations
论文作者
论文摘要
从理论上讲，我们通过使用第一原理计算和一种我们称为倒数空间算法（RSA）的方法来研究稀土磁铁化合物中的自旋波散。 ND $ _2 $ fe $ _ {14} $ b的计算交换刚度的值在报告的实验值范围内。我们发现，当仅考虑短程交换耦合时，交换刚度非常各向异性，而包含远距离耦合会削弱各向异性。相比之下，$ r $ fe $ _ {11} $ ti（$ r $ = y，nd，sm）在交换刚度中显示出大型各向异性。
We theoretically investigate spin-wave dispersion in rare-earth magnet compounds by using first-principles calculations and a method we call the reciprocal-space algorithm (RSA). The value of the calculated exchange stiffness for Nd$_2$Fe$_{14}$B is within the range of reported experimental values. We find that the exchange stiffness is considerably anisotropic when only short-range exchange couplings are considered, whereas inclusion of long-range couplings weakens the anisotropy. In contrast, $R$Fe$_{11}$Ti ($R$=Y, Nd, Sm) shows large anisotropy in the exchange stiffness.
