The Dzyaloshinskii-Moriya interaction (DMI) has drawn much attention, as it stabilizes magnetic chirality, with important implications in fundamental and applied research. This antisymmetric exchange interaction is induced by the broken inversion symmetry at interfaces or in noncentrosymmetric lattices. Significant interfacial DMIs are often found at magnetic/heavy-metal interfaces with large spin-orbit coupling. Recent studies have shown promise for induced DMI at interfaces involving light elements such as carbon (graphene) or oxygen. Here, we report direct observation of induced DMI by chemisorption of the lightest element, hydrogen, on a ferromagnetic layer at room temperature, which is supported by density functional theory calculations. We further demonstrate a reversible chirality transition of the magnetic domain walls due to the induced DMI via hydrogen chemisorption and desorption. These results shed new light on the understanding of DMI in low atomic number materials and the design of novel chiral spintronics and magneto-ionic devices.

中文翻译：

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氢诱导的Dzyaloshinskii-Moriya相互作用和磁手性的可逆转换的观察

Dzyaloshinskii-Moriya相互作用（DMI）引起了人们的广泛关注，因为它稳定了手性，在基础研究和应用研究中都具有重要意义。这种反对称的交换相互作用是由界面或非中心对称晶格中反演对称性的破坏引起的。重要的界面DMI通常在具有大自旋轨道耦合的磁性/重金属界面处发现。最近的研究表明，在涉及轻元素（例如碳（石墨烯）或氧气）的界面上诱发DMI的可能性很大。在这里，我们报告通过在室温下铁磁性层上最轻元素氢的化学吸附对诱导DMI的直接观察，这得到密度泛函理论计算的支持。我们进一步证明了磁畴壁的可逆手性转变，归因于通过氢化学吸附和解吸引起的DMI。这些结果为了解低原子序数材料中的DMI以及新型手性自旋电子学和磁离子器件的设计提供了新的思路。