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

Phys. Rev. B 103, 024418 (2021) 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 o...

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Bibliographic Details
Main Authors Fukazawa, Taro, Akai, Hisazumi, Harashima, Yosuke, Miyake, Takashi
Format Journal Article
LanguageEnglish
Published 29.10.2020
Subjects
Physics - Materials Science
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Summary:Phys. Rev. B 103, 024418 (2021) 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.
DOI:10.48550/arxiv.2010.16022