Measuring the Dzyaloshinskii-Moriya interaction in a weak ferromagnet
Measuring the Dzyaloshinskii-Moriya interaction in a weak ferromagnet
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DOI：
10.1038/nphys2859
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发表时间：
2014-03-01
期刊：
影响因子：
19.6
通讯作者：
Katsnelson, M. I.
中科院分区：
文献类型：
--
作者：
Dmitrienko, V. E.;Ovchinnikova, E. N.;Katsnelson, M. I.
磁性（材料中原子矩的自发排列）是由在原子间距离上运行的量子力学交换相互作用驱动的。一些磁相互作用会导致（1,2）原子排列的扭曲，或者由（3,4）引起。这可能导致磁电效应（预计将在未来技术中发挥重要作用）以及弱铁磁性现象（受所谓的 Dzyaloshinskii-Moriya 相互作用控制）(5-8)。在这里，我们通过使用同步辐射确定硼酸铁 (FeBO3) 中后者相互作用的符号。我们提出了一种基于两个 X 射线散射过程之间的干涉的新颖实验技术，其中一个作为参考波。我们的实验结果通过最先进的从头计算得到验证。我们的实验和理论方法有望共同为探索、建模和开发新型磁性和磁电材料开辟新的可能性。
Magnetism-the spontaneous alignment of atomic moments in a material-is driven by quantum mechanical exchange interactions that operate over interatomic distances. Some magnetic interactions cause(1,2), or are caused by(3,4), a twisting of arrangements of atoms. This can lead to the magnetoelectric effect, predicted to play a prominent role in future technology, and to the phenomenon of weak ferromagnetism, governed by the so-called Dzyaloshinskii-Moriya interaction(5-8). Here we determine the sign of the latter interaction in iron borate (FeBO3) by using synchrotron radiation. We present a novel experimental technique based on the interference between two X-ray scattering processes, where one acts as a reference wave. Our experimental results are validated by state-of-the-art ab initio calculations. Together, our experimental and theoretical approaches are expected to open up new possibilities for exploring, modelling and exploiting novel magnetic and magnetoelectric materials.