Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany.
Phys Rev Lett. 2012 Nov 16;109(20):207201. doi: 10.1103/PhysRevLett.109.207201. Epub 2012 Nov 14.
We present a combined experimental and theoretical study of the interplay between the atomic structure and the magnon excitations in low dimensional ferromagnets. Two monolayer thick Fe films on W(110) with and without a Au buffer layer are investigated. Our experiments show that adding the Au layer leads to a significant softening of the magnons. First-principles calculations confirm the experimental results revealing a strong dependency of exchange interactions on the atomic structure. It is observed that the intralayer exchange interactions increase with increasing distance between Fe layers. This unusual relationship is attributed to the complexity of the electronic structure and the contribution of different orbitals to the hybridization and exchange interaction. Our results suggest a way of tailoring magnetic excitations in low-dimensional magnetic structures.
我们呈现了一项关于低维铁磁体中原子结构和磁振子激发相互作用的实验和理论综合研究。我们研究了具有和不具有 Au 缓冲层的两种单层厚 Fe 薄膜在 W(110)上的情况。我们的实验表明，添加 Au 层会导致磁振子显著软化。第一性原理计算证实了实验结果，揭示了交换相互作用对原子结构的强烈依赖性。我们观察到，层间交换相互作用随 Fe 层之间距离的增加而增加。这种异常关系归因于电子结构的复杂性以及不同轨道对杂化和交换相互作用的贡献。我们的结果为低维磁性结构中磁振子的定制提供了一种方法。
