ABSTRACT

To broaden the scope of van der Waals 2D magnets, we report the synthesis and magnetism of covalent 2D magnetic Cr₂Te₃ with a thickness down to one-unit-cell. The 2D Cr₂Te₃ 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 Cr₂Te₃, suggesting its potential application for injecting carriers with high spin polarization into spintronic devices.

摘要

为了扩大范德华2D磁体的范围，我们报道了共价2D磁性Cr ₂ Te ₃的合成和磁化，其厚度低至一个单元电池。2D Cr ₂ Te ₃晶体表现出强大的铁磁性，居里温度为180 K，垂直各向异性大为7×10 ⁵  J m ^-3，在20 K时的矫顽力约为4.6 kG。第一原理计算还表明原子薄Cr ₂ Te _3中从倾斜铁磁过渡到共线铁磁，从垂直各向异性到面内各向异性的过渡以及出现的半金属行为，表明其在将高自旋极化的载流子注入自旋电子器件中的潜在应用。