Direct Photoluminescence Probing of Ferromagnetism in Monolayer Two-Dimensional CrBr3.
Direct Photoluminescence Probing of Ferromagnetism in Monolayer Two-Dimensional CrBr3.
复制标题
DOI：
10.1021/acs.nanolett.9b00553
复制
发表时间：
2019-02
期刊：
影响因子：
10.8
通讯作者：
Zhao-Gang Zhang;J. Shang;Chongyun Jiang;A. Rasmita;Wei‐bo Gao;T. Yu
中科院分区：
文献类型：
--
作者：
Zhao-Gang Zhang;J. Shang;Chongyun Jiang;A. Rasmita;Wei‐bo Gao;T. Yu
原子级薄磁体是建立基于二维材料的自旋电子学的关键。二维铁磁体的表面性质为有效提高器件性能提供了机会。在这里，我们报告的内在铁磁性原子薄单层CrBr 3，直接探测偏振分辨磁光致发光。在居里温度为34 K的单层CrBr 3中，自发磁化强度持续存在。磁振子在热激发下的发展符合自旋波理论。我们属性的层数依赖于磁滞回线在厚层的磁畴结构。CrBr3作为一种在空气中稳定存在的单层材料，为基础物理研究提供了一个方便的平台，推动了二维铁磁性的潜在应用。
Atomically thin magnets are the key element to build up spintronics based on two-dimensional materials. The surface nature of two-dimensional ferromagnet opens up opportunities to improve the device performance efficiently. Here, we report the intrinsic ferromagnetism in atomically thin monolayer CrBr3, directly probed by polarization resolved magneto-photoluminescence. The spontaneous magnetization persists in monolayer CrBr3 with a Curie temperature of 34 K. The development of magnons by the thermal excitation is in line with the spin-wave theory. We attribute the layer-number-dependent hysteresis loops in thick layers to the magnetic domain structures. As a stable monolayer material in air, CrBr3 provides a convenient platform for fundamental physics and pushes the potential applications of the two-dimensional ferromagnetism.