原子级薄碲化钴的磁化强度倍增效应
Multifold enhancement in magnetization of atomically thin Cobalt Telluride
摘要：
半导体二维（2D）材料中的磁性由于其在存储器件、传感器、自旋电子学和生物医学应用中的潜在应用而越来越受欢迎。在这里，2D碲化钴（CoTe）已合成从其散装晶体使用一个简单的和可扩展的液相剥离方法。原子薄的CoTe显示出超过四百倍的增强，其磁饱和值相比，散装形式。UV-Vis吸收光谱显示在高能量区域中的优异吸收，表明半导体性质。通过密度泛函理论计算，解释了高磁行为的起源和带隙。二维CoTe由于表面原子配位数的减少、形状各向异性和表面电荷效应而显示出比体CoTe更大的磁性。
英文摘要：
Magnetism in semiconductor two-dimensional (2D) materials is gaining popularity due to its potential application in memory devices, sensors, spintronic and biomedical applications. Here, 2D Cobalt Telluride (CoTe) has been synthesized from its bulk crystals using a simple and scalable liquid-phase exfoliation method. The atomically thin CoTe shows over four hundred times enhancement in its magnetic saturation values compared to the bulk form. The UV-Vis absorption spectra reveal superior absorption in the high energy region, suggesting a semiconducting nature. Furthermore, we explain bandgap and origin of high magnetic behavior by density functional theory (DFT) calculations. The 2D CoTe shows a larger magnetism compared to bulk CoTe due to the reduced coordination number of the surface atoms, shape anisotropy and surface charge effect.
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