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arXiv 1503.03777cond-mat.mtrl-sci
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Mn $_{1-x}$ Fe $_x$ Ge中Dzyaloshinskii-Moriya相互作用控制的第一性原理研究

Control of Dzyaloshinskii-Moriya interaction in Mn$_{1-x}$Fe$_x$Ge: a first-principles study

Takashi Koretsune, Naoto Nagaosa, Ryotaro Arita

摘要:

受Mn $_{1-x}$ Fe $_x$ Ge [K. Shibata等人,Nature Nanotechnology 8,732(2013)],我们研究了Dzyaloshinskiii-Moriya(DM)相互作用如何改变其在金属helimagnets中的大小和符号。通过第一性原理计算,我们成功地再现了实验中观察到的DM相互作用的非平凡符号变化。虽然DM相互作用敏感地依赖于载流子密度或电子结构的细节,如交换分裂的大小,但它的行为可以根据能带结构中的反交叉点的分布来系统地理解。通过遵循这一指导原则,我们甚至可以通过向系统施加应变来在DM相互作用中诱导巨大的各向异性。这些结果为金属螺旋磁体中Skyrmion晶体工程开辟了新的途径。

英文摘要:

Motivated by the recent experiment on the size and helicity control of skyrmions in Mn$_{1-x}$Fe$_x$Ge [K. Shibata et al., Nature Nanotechnology 8, 732 (2013)], we study how the Dzyaloshinskii-Moriya (DM) interaction changes its size and sign in metallic helimagnets. By means of first-principles calculations, we successfully reproduce the non-trivial sign change of the DM interaction observed in the experiment. While the DM interaction sensitively depends on the carrier density or the detail of the electronic structure such as the size of the exchange splitting, its behavior can be systematically understood in terms of the distribution of anticrossing points in the band structure. By following this guiding principle, we can even induce gigantic anisotropy in the DM interaction by applying a strain to the system. These results pave the new way for skyrmion crystal engineering in metallic helimagnets.

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