Extreme Air Sensitivity and Nonself-Limited Oxidation of Two-Dimensional Magnetic Tellurides
Extreme Air Sensitivity and Nonself-Limited Oxidation of Two-Dimensional Magnetic Tellurides
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DOI：
10.1021/acsmaterialslett.3c00395
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发表时间：
2023-06
影响因子：
11.4
通讯作者：
Amanda L. Coughlin;Jun-Jie Zhang;Sammy Bourji;B. Wei;Gaihua Ye;Zhipeng Ye;Jeonghoon Hong;T. Zhang;Magda Andrade;Xun Zhan;R. He;Jian Wang;B. Yakobson;Y. Losovyj;C. Chu;L. Deng;Shixiong Zhang
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文献类型：
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作者：
Amanda L. Coughlin;Jun-Jie Zhang;Sammy Bourji;B. Wei;Gaihua Ye;Zhipeng Ye;Jeonghoon Hong;T. Zhang;Magda Andrade;Xun Zhan;R. He;Jian Wang;B. Yakobson;Y. Losovyj;C. Chu;L. Deng;Shixiong Zhang
二维自插层货车德瓦耳斯磁体--碲化铬（Cr 1 +δ Te 2），具有室温铁磁性和奇异的自旋拓扑织构，已成为发展自旋电子器件的一个有吸引力的平台。虽然许多先前的研究声称Cr 1 +δ Te 2是空气稳定的，这对于实际应用至关重要，但我们证明，在室温下，纳米片的拉曼和X射线光电子能谱在暴露于空气的仅几分钟内发生剧烈变化。随时间变化的磁化强度测量和透射电子显微镜研究表明，快速氧化不是自限性的，在表面和边缘有不同的过程。密度泛函理论计算证实了氧在表面上的自发吸附和化学上有利的氧化过程。这些发现明确地表明，Cr 1 +δ Te 2的表面是非常空气敏感的，突出了表面保护的必要性，内在的二维磁性的基础研究和先进的自旋电子器件的实际应用。
The two-dimensional (2D) self-intercalated van der Waals magnets, chromium tellurides (Cr1+δTe2), with room temperature ferromagnetism and exotic topological spin textures, have emerged as an attractive platform for the development of ultrathin spintronic devices. While many prior studies claim Cr1+δTe2are air-stable, which is crucial for practical applications, we demonstrate that within only minutes of exposure to air dramatic changes occur in the Raman and X-ray photoelectron spectroscopy spectra of nanoplates at room temperature. Time-dependent magnetization measurements and transmission electron microscopy studies suggested the rapid oxidation is not self-limited and has distinct processes on the surfaces and edges. Density functional theory calculations confirmed the spontaneous oxygen adsorption on the surface and the thermodynamically favorable oxidation process. These findings demonstrate unambiguously that the surface of Cr1+δTe2is extremely air-sensitive, highlighting the necessity of surface protection for fundamental studies of intrinsic 2D magnetism and practical applications of advanced spintronic devices.