Epitaxial growth of large-grain-size ferromagnetic monolayer CrI3 for valley Zeeman splitting enhancement
Epitaxial growth of large-grain-size ferromagnetic monolayer CrI3 for valley Zeeman splitting enhancement
复制标题
用于谷塞曼分裂增强的大晶粒铁磁单层 CrI3 外延生长
DOI：
10.1039/d0nr08248a
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发表时间：
2021
期刊：
影响因子：
6.7
通讯作者：
Huang Wei
中科院分区：
文献类型：
--
作者：
Gong Lipeng;Zhang Cheng;Nie Anmin;Lin Changqing;Zhang Hao;Gao Chaofeng;Wang Meng;Zhang Xi;Han Nannan;Su Huimin;Lin Chen;Jin Yizheng;Zhang Chenhui;Zhang Xixiang;Dai Jun-Feng;Cheng Yingchun;Huang Wei
二维（2D）磁性CrI3由于其固有的特性（包括绝缘性、伊辛铁磁性和依赖于堆叠顺序的磁性）以及在自旋电子学应用中的潜力而受到相当大的研究关注。然而，目前的策略，用于生产的环境不稳定的CrI3薄层是有限的机械剥离，这通常遭受不可控的层厚度，小尺寸，和低但不可预测的产量。在这里，通过限制气相外延（CVE）的方法，我们证明了大规模生产的花状碘化铬单层云母。有趣的是，我们发现云母表面的K离子在决定单层CrI 3形态方面发挥着至关重要的作用，与前体反应形成KIx缓冲层。同时，运输代理影响的厚度和尺寸的CrI3生长。此外，CrI3的居里温度受CrI3与衬底之间的相互作用的影响很大。单层的CrI3云母可以作为一个磁性基板的谷塞曼分裂增强的WSe2。我们认为我们的工作代表了单层2D CrI3大规模生产的重大进展，并预计我们的增长策略可能会扩展到其他过渡金属卤化物。
Two-dimensional (2D) magnetic CrI3 has received considerable research attention because of its intrinsic features, including insulation, Ising ferromagnetism, and stacking-order-dependent magnetism, as well as potential in spintronic applications. However, the current strategy for the production of ambient-unstable CrI3 thin layer is limited to mechanical exfoliation, which normally suffers from uncontrollable layer thickness, small size, and low yet unpredictable yield. Here, via a confined vapor epitaxy (CVE) method, we demonstrate the mass production of flower-like CrI3 monolayers on mica. Interestingly, we discovered the crucial role of K ions on the mica surface in determining the morphology of monolayer CrI3, reacting with precursors to form a KIx buffer layer. Meanwhile, the transport agent affects the thickness and size of the as-grown CrI3. Moreover, the Curie temperature of CrI3 is greatly affected by the interaction between CrI3 and the substrate. The monolayer CrI3 on mica could act as a magnetic substrate for valley Zeeman splitting enhancement of WSe2. We reckon our work represents a major advancement in the mass production of monolayer 2D CrI3 and anticipate that our growth strategy may be extended to other transition metal halides.