共价二维Cr $_2$ Te $_3$铁磁体
Covalent 2D Cr$_2$Te$_3$ ferromagnet
摘要：
为了拓宽范德瓦尔斯二维磁体的应用范围，我们报道了共价二维磁性Cr $_2$ Te $_3$的合成及其磁性，其厚度可达一个晶胞。2D Cr $_2$ Te $_3$晶体具有很强的铁磁性，居里温度为180 K，垂直各向异性为7 × 105 J m-3，20 K时的矫顽力约为4.6 kG.第一性原理计算进一步显示了从倾斜到共线铁磁性的转变，从垂直到面内各向异性的转变，以及原子级薄的Cr $_2$ Te $_3$中出现的半金属行为，这表明其在将具有高自旋极化的载流子注入到自旋电子器件中的潜在应用。
英文摘要：
To broaden the scope of van der Waals 2D magnets, we report the synthesis and magnetism of covalent 2D magnetic Cr$_2$Te$_3$ with a thickness down to one-unit-cell. The 2D Cr$_2$Te$_3$ crystals exhibit robust ferromagnetism with a Curie temperature of 180 K, a large perpendicular anisotropy of 7*105 J m-3, and a high coercivity of ~ 4.6 kG at 20 K. First-principles calculations further show a transition from canted to collinear ferromagnetism, a transition from perpendicular to in-plane anisotropy, and emergent half-metallic behavior in atomically-thin Cr$_2$Te$_3$, suggesting its potential application for injecting carriers with high spin polarization into spintronic devices.
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