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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Ferromagnetic ordering in a THAB exfoliated WS2 nanosheet
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Ferromagnetic ordering in a THAB exfoliated WS2 nanosheet

机译：Thab exfoliated的铁磁排序WS2 Nanosheet

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摘要

Because of the important role of two-dimensional (2D) magnetic semiconductors in low-dimensional spintronic devices, the generation of ferromagnetism within an ultrathin semiconducting sheet of a transition metal dichalcogenide is highly desirable. A pristine WS2 sheet is a diamagnetic semiconducting transition metal dichalcogenide with superior electronic properties. In this study, we synthesised a free-standing WS2 sheet by a chemical route followed by electrochemical exfoliation by a giant molecule. During exfoliation of the WS2 crystal, atomic vacancies were created in the sheet with a lower number of layers. To understand the mechanism of exfoliation, we carried out x-ray diffraction, transmission electron microscopy, atomic force microscopy and Raman measurements. The types of atomic vacancies were realised by energy-dispersive x-ray spectroscopy, high-resolution transmission electron microscopy (fast Fourier transform), and x-ray photoelectron spectroscopy studies. We also observed a ferromagnetic ordering within the exfoliated WS2 sheet, which is explained on the basis of the generation of an atomic vacancy induced spin-moment. The transport study of the exfoliated WS2 sheet suggests that the electro-transport behaviour still remains as a semiconductor even after exfoliation. This ferromagnetic semiconducting system will be applicable in spintronic devices and this technique will enrich the literature, particularly for the preparation of a 2D semiconducting ferromagnet in a facile fashion.
机译：由于二维（2D）磁性半导体在低维自旋电子学器件中的重要作用，在过渡金属二氯化铝的超薄半导体片中产生铁磁性是非常理想的。原始WS2片材是一种具有优异电子性能的抗磁性半导体过渡金属二卤化物。在这项研究中，我们通过化学途径合成了一个独立的WS2膜，然后通过大分子进行电化学剥离。在WS2晶体剥落过程中，原子空位在层数较少的薄片中产生。为了了解剥落的机理，我们进行了x射线衍射、透射电子显微镜、原子力显微镜和拉曼测量。原子空位的类型是通过能量色散x射线光谱、高分辨率透射电子显微镜（快速傅里叶变换）和x射线光电子能谱研究实现的。我们还观察到在剥落的WS2薄片中存在铁磁有序，这是根据原子空位诱导自旋矩的产生来解释的。剥离WS2薄片的输运研究表明，即使在剥离之后，电输运行为仍然是半导体。这种铁磁半导体系统将适用于自旋电子学器件，这项技术将丰富文献，特别是以一种简单的方式制备二维半导体铁磁体。

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