التفاصيل البيبلوغرافية
| العنوان: |
Role of Magnetic Dipole--Dipole Interaction on Magnon in NiO. |
| المؤلفون: |
Gumarilang, Andi, Kenji Nawa, Kohji Nakamura |
| المصدر: |
Journal of the Physical Society of Japan; 8/15/2023, Vol. 92 Issue 8, p1-6, 6p |
| مستخلص: |
The role of magnetic anisotropy on magnon in NiO was theoretically investigated. By using first-principles calculations, magnetic parameters of spin-exchange constants, magnetocrystalline anisotropy (MCA) constant, and magnetic moment for the anisotropy by magnetic dipole--dipole interaction (MDIA) were extracted, where the MDIA is found to have a more dominant contribution to the magnetic anisotropy than the MCA does. Second quantization representation reveals that the MDIA lifts the degeneracy to two magnon modes, labeled as α and β modes, and agrees with experiments. The magnon frequency in the α mode has a large shift to higher frequency due to the MDIA, while the β mode is less affected, which is successfully illustrated by the different magnetization precessions of two-sublattices antiferromagnet. Finally, the MDIA creates magnon group velocity difference between the two modes at shorter wavevectors, which contributes to spin transport phenomena. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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