Few-Layer SrRu2O6 Nanosheets as Non-Van der Waals Honeycomb Antiferromagnets: Implications for Two-Dimensional Spintronics
Few-Layer SrRu2O6 Nanosheets as Non-Van der Waals Honeycomb Antiferromagnets: Implications for Two-Dimensional Spintronics
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DOI：
10.1021/acsanm.1c01788
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发表时间：
2021-08
影响因子：
5.9
通讯作者：
S. Homkar;Bharat Chand;S. Rajput;S. Gorantla;Tilak Das;Rohit Babar;Shivprasad Patil;R. Klingeler;S. Nair;M. Kabir;A. Bajpai
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作者：
S. Homkar;Bharat Chand;S. Rajput;S. Gorantla;Tilak Das;Rohit Babar;Shivprasad Patil;R. Klingeler;S. Nair;M. Kabir;A. Bajpai
目前实验实现的基于三维过渡金属离子的二维磁性材料具有较弱的自旋-轨道耦合。相反，我们在化学键合的层状氧化物SrRu2O6中报道了一种新的平台。总的来说，这个系统以强烈的电子关联和竞争的自旋-轨道耦合而闻名。我们介绍了超薄纳米SrRu2O6的合成和表征，并用第一性原理计算探讨了它们的磁态。采用可伸缩的液体剥离技术合成了SrRu2O6纳米薄片。原子力显微镜显示，纳米薄片的厚度在三到五个单层之间变化。实验数据还表明，剥离发生在垂直于c轴的平面上，其中插入的六方锶晶格分隔了二维Ru蜂窝。高分辨电子显微镜图像表明，Ru层之间的平均原子间距略有减小，这与密度泛函理论(DFT)的计算结果一致。还观察到了纳米薄片旋转堆积的特征。在第一性原理计算中，我们证明了反铁磁性存在于这些纳米薄片中。SrRu2O6类石墨烯二维(2D)薄层的实验实现为探索具有大自旋-轨道耦合的磁性蜂窝的出现性质提供了巨大的可能性，该系统很有可能在反铁磁自旋电子学领域得到应用。
The current family of experimentally realized two-dimensional magnetic materials, based on 3d transition metal ions, possesses weak spin–orbit coupling. In contrast, we report a novel platform in a chemically bonded and layered oxide SrRu2O6. In bulk, this system is known for strong electron correlations and competing spin–orbit coupling. We present the synthesis and characterization of ultrathin nanosheets of SrRu2O6along with first-principles calculations to explore their magnetic state. SrRu2O6nanosheets are synthesized using a scalable technique of liquid exfoliation. Atomic force microscopy reveals that the thickness of the nanosheets varies between three and five monolayers. Experimental data also suggest that exfoliation occurs from the planes perpendicular to thec-axis wherein the intervening hexagonal Sr lattice separates the two-dimensional Ru honeycomb. The high-resolution transmission electron microscopy images indicate that the average interatomic spacing between the Ru layers is slightly reduced, which agrees with the density functional theory (DFT) calculations. The signatures of rotational stacking of the nanosheets are also observed. Within the first-principles calculations, we show that antiferromagnetism survives in these nanosheets. The experimental realization of graphene-like two-dimensional (2D) sheets of SrRu2O6offers enormous possibilities to explore emergent properties associated with a magnetic honeycomb with large spin–orbit coupling, and this system is likely to have applications in the area of antiferromagnetic spintronics.