Energies and Lifetimes of Magnons in Complex Ferromagnets: A First-Principle Study of Heusler Alloys
Energies and Lifetimes of Magnons in Complex Ferromagnets: A First-Principle Study of Heusler Alloys
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DOI：
10.1103/physrevlett.102.247206
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发表时间：
2009-06-19
影响因子：
8.6
通讯作者：
Sandratskii, Leonid M.
中科院分区：
文献类型：
--
作者：
Buczek, Pawel;Ernst, Arthur;Sandratskii, Leonid M.
使用线性响应密度泛函理论研究了几种锰基霍斯勒合金中磁振子的能量和寿命。 Co2MnSi 中自旋波分支的数量对应于其磁性子晶格的数量，与 NiMnSb 情况相反，在 NiMnSb 中，感应 Ni 子晶格不能支持光学磁振子。这些系统的半金属性导致了长寿命的声自旋波。非半金属 Cu2MnAl 的例子表明，与斯托纳连续谱的杂化不仅导致磁振子的阻尼，而且导致其能量的重整化。
The energies and lifetimes of magnons in several Mn-based Heusler alloys are studied using linear response density functional theory. The number of the spin wave branches in Co2MnSi corresponds to the number of its magnetic sublattices in contrast with the NiMnSb case in which the induced Ni sublattice cannot support optical magnons. The half-metallicity of these systems results in long-living acoustic spin waves. The example of non-half-metallic Cu2MnAl shows that the hybridization with Stoner continuum leads not only to the damping of magnons but also to a renormalization of their energies.