Spin-wave dispersion and exchange stiffness in Nd2Fe14B and RFe11Ti (R=Y, Nd, Sm) from first-principles calculations

被引：4
|
作者：
Fukazawa, Taro [1 ,2 ]
Akai, Hisazumi [2 ,3 ]
Harashima, Yosuke [1 ,2 ,4 ]
Miyake, Takashi [1 ,2 ]
机构：
[1] Natl Inst Adv Ind Sci & Technol, CD FMat, Tsukuba, Ibaraki 3058568, Japan
[2] Natl Inst Mat Sci, ESICMM, Tsukuba, Ibaraki 3050047, Japan
[3] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan
[4] Nagoya Univ, Inst Mat & Syst Sustainabil, Nagoya, Aichi 4648601, Japan
来源：
PHYSICAL REVIEW B | 2021年 / 103卷 / 02期
关键词：
NEUTRON-SCATTERING MEASUREMENTS; FE;
D O I：
10.1103/PhysRevB.103.024418
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
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页数：7
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