Spin-wave dispersion and exchange stiffness in Nd2Fe14B and RFe11Ti (R=Y, Nd, Sm) from first-principles calculations
Spin-wave dispersion and exchange stiffness in Nd2Fe14B and RFe11Ti (R=Y, Nd, Sm) from first-principles calculations
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DOI：
10.1103/physrevb.103.024418
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发表时间：
2021-01-13
影响因子：
3.7
通讯作者：
Miyake, Takashi
中科院分区：
文献类型：
--
作者：
Fukazawa, Taro;Akai, Hisazumi;Miyake, Takashi
我们通过使用第一原理计算和我们称为倒易空间算法的方法，从理论上研究稀土磁体化合物中的自旋波色散。 Nd2Fe14B 的计算交换刚度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，交换刚度具有相当大的各向异性，而包含长程耦合会削弱各向异性。相比之下，RFe11Ti（R = Y、Nd、Sm）在交换刚度方面表现出较大的各向异性。
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. The value of the calculated exchange stiffness for Nd2Fe14B 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, RFe11Ti (R = Y, Nd, Sm) shows large anisotropy in the exchange stiffness.