Anomalous thickness dependence of Curie temperature in air-stable two-dimensional ferromagnetic 1T-CrTe(2) grown by chemical vapor deposition.
Anomalous thickness dependence of Curie temperature in air-stable two-dimensional ferromagnetic 1T-CrTe(2) grown by chemical vapor deposition.
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化学气相沉积法生长的空气稳定二维铁磁 1T-CrTe2 居里温度的反常厚度依赖性
DOI：
10.1038/s41467-021-21072-z
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发表时间：
2021-02-05
影响因子：
16.6
通讯作者：
Gong Y
中科院分区：
文献类型：
--
作者：
Meng L;Zhou Z;Xu M;Yang S;Si K;Liu L;Wang X;Jiang H;Li B;Qin P;Zhang P;Wang J;Liu Z;Tang P;Ye Y;Zhou W;Bao L;Gao HJ;Gong Y
铁磁二维货车德瓦尔斯材料的发现为探索有趣的物理学和开发创新的自旋电子器件提供了机会。然而，这些2D铁磁体的可控合成和提高其在环境条件下的稳定性仍然具有挑战性。在这里，我们报告的空气稳定的2D金属1 T-CrTe 2超导晶体的控制厚度的化学气相沉积生长。他们的长程铁磁有序证实了一个强大的异常霍尔效应，这是很少观察到在其他层状二维材料生长的化学气相沉积。随着1 T-CrTe 2的厚度从几十纳米减小到几纳米，易磁化轴从面内变为面外。居里温度随薄膜厚度从~130.0 nm减小到~7.6 nm而单调增加。理论计算表明，在二维极限下库仑屏蔽的减弱对磁性能的变化起着至关重要的作用。
The discovery of ferromagnetic two-dimensional van der Waals materials has opened up opportunities to explore intriguing physics and to develop innovative spintronic devices. However, controllable synthesis of these 2D ferromagnets and enhancing their stability under ambient conditions remain challenging. Here, we report chemical vapor deposition growth of air-stable 2D metallic 1T-CrTe2 ultrathin crystals with controlled thickness. Their long-range ferromagnetic ordering is confirmed by a robust anomalous Hall effect, which has seldom been observed in other layered 2D materials grown by chemical vapor deposition. With reducing the thickness of 1T-CrTe2 from tens of nanometers to several nanometers, the easy axis changes from in-plane to out-of-plane. Monotonic increase of Curie temperature with the thickness decreasing from ~130.0 to ~7.6 nm is observed. Theoretical calculations indicate that the weakening of the Coulomb screening in the two-dimensional limit plays a crucial role in the change of magnetic properties.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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