Hantanasirisakul Kanit, Anasori Babak, Nemsak Slavomir, Hart James L, Wu Jiabin, Yang Yizhou, Chopdekar Rajesh V, Shafer Padraic, May Andrew F, Moon Eun Ju, Zhou Jun, Zhang Qinghua, Taheri Mitra L, May Steven J, Gogotsi Yury
A.J. Drexel Nanomaterials Institute, Drexel University, Philadelphia, PA 19104, USA.
Nanoscale Horiz. 2020 Dec 1;5(12):1557-1565. doi: 10.1039/d0nh00343c. Epub 2020 Oct 22.
Two-dimensional (2D) transition metal carbides and nitrides known as MXenes have shown attractive functionalities such as high electronic conductivity, a wide range of optical properties, versatile transition metal and surface chemistry, and solution processability. Although extensively studied computationally, the magnetic properties of this large family of 2D materials await experimental exploration. 2D magnetic materials have recently attracted significant interest as model systems to understand low-dimensional magnetism and for potential spintronic applications. Here, we report on synthesis of CrTiCT MXene and a detailed study of its magnetic as well as electronic properties. Using a combination of magnetometry, synchrotron X-ray linear dichroism, and field- and angular-dependent magnetoresistance measurements, we find clear evidence of a magnetic transition in CrTiCT at approximately 30 K, which is not present in its bulk layered carbide counterpart (CrTiAlC MAX phase). This work presents the first experimental evidence of a magnetic transition in a MXene material and provides an exciting opportunity to explore magnetism in this large family of 2D materials.
被称为MXenes的二维（2D）过渡金属碳化物和氮化物展现出了诸如高电子导电性、广泛的光学性质、多样的过渡金属和表面化学性质以及溶液可加工性等吸引人的功能特性。尽管在计算方面已经进行了广泛研究，但这类二维材料大家族的磁性仍有待实验探索。二维磁性材料最近作为理解低维磁性的模型系统以及潜在的自旋电子学应用引起了极大关注。在此，我们报告了CrTiCT MXene的合成及其磁性和电子性质的详细研究。通过结合磁力测量、同步加速器X射线线性二色性以及场和角度相关的磁电阻测量，我们发现了CrTiCT在约30 K处发生磁转变的明确证据，而其块状层状碳化物对应物（CrTiAlC MAX相）中不存在这种转变。这项工作提供了MXene材料中磁转变的首个实验证据，并为探索这类二维材料大家族中的磁性提供了一个令人兴奋的机会。
