Significant Dzyaloshinskii–Moriya interaction at graphene–ferromagnet interfaces due to the Rashba effect
Significant Dzyaloshinskii–Moriya interaction at graphene–ferromagnet interfaces due to the Rashba effect
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DOI：
10.1038/s41563-018-0079-4
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发表时间：
2017-04
期刊：
影响因子：
41.2
通讯作者：
Hongxin Yang;Gong Chen;A. Cotta;A. N’Diaye;S. Nikolaev;E. A. Soares;W. Macedo;Kai Liu;A. Sch
中科院分区：
文献类型：
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作者：
Hongxin Yang;Gong Chen;A. Cotta;A. N’Diaye;S. Nikolaev;E. A. Soares;W. Macedo;Kai Liu;A. Sch
利用石墨烯丰富的自旋相关性质的可能性在追求自旋电子学进步方面引起了广泛关注。高速和低能耗设备的前景促使人们寻找稳定手性自旋纹理的分层结构，如拓扑保护的skyrmions。在这里，我们证明了手性自旋纹理诱导石墨烯/铁磁金属界面。石墨烯是一种弱自旋-轨道耦合材料，并且通常预期不会诱导足够的Dzyaloshinskiii-Moriya相互作用来影响磁手性。我们证明，石墨烯确实诱导一种类型的Dzyaloshinskiii-Moriya相互作用由于Rashba效应。使用自旋极化电子显微镜的第一性原理计算和实验表明，这种石墨烯诱导的Dzyaloshinskiii-Moriya相互作用可以具有与重金属界面相似的量级。这项工作为基于二维材料的自旋轨道电子学铺平了道路。
The possibility of utilizing the rich spin-dependent properties of graphene has attracted much attention in the pursuit of spintronics advances. The promise of high-speed and low-energy-consumption devices motivates the search for layered structures that stabilize chiral spin textures such as topologically protected skyrmions. Here we demonstrate that chiral spin textures are induced at graphene/ferromagnetic metal interfaces. Graphene is a weak spin–orbit coupling material and is generally not expected to induce a sufficient Dzyaloshinskii–Moriya interaction to affect magnetic chirality. We demonstrate that indeed graphene does induce a type of Dzyaloshinskii–Moriya interaction due to the Rashba effect. First-principles calculations and experiments using spin-polarized electron microscopy show that this graphene-induced Dzyaloshinskii–Moriya interaction can have a similar magnitude to that at interfaces with heavy metals. This work paves a path towards two-dimensional-material-based spin–orbitronics.