Magnetic Order and Symmetry in the 2D Semiconductor CrSBr
Magnetic Order and Symmetry in the 2D Semiconductor CrSBr
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DOI：
10.1021/acs.nanolett.1c00219
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发表时间：
2021-04-15
期刊：
影响因子：
10.8
通讯作者：
Zhu, Xiaoyang
中科院分区：
文献类型：
--
作者：
Lee, Kihong;Dismukes, Avalon H.;Zhu, Xiaoyang
二维（2D）磁体的出现提供了对电子和自旋的前所未有的控制。决定交换耦合和磁序的关键因素是对称性。在这里，我们应用二次谐波产生（SHG）探测二维磁性半导体CrSBr。我们发现，单层铁磁有序低于146 K，一个大的磁偶极子SHG效应的中心对称结构的发现，使观察。在多层膜中，铁磁单层是反铁磁耦合的，与其他2D磁体相比，CrSBr的Neel温度随着层数的减少而增加。我们确定磁偶极子和磁环矩作为序参数的铁磁单层和反铁磁双层，分别。这些发现建立CrSBr作为一个令人兴奋的二维磁性半导体和扩展的磁对称性的SHG探头单层极限，打开大门，探索应用的磁电耦合和磁环矩。
The advent of two-dimensional (2D) magnets offers unprecedented control over electrons and spins. A key factor in determining exchange coupling and magnetic order is symmetry. Here, we apply second harmonic generation (SHG) to probe a 2D magnetic semiconductor CrSBr. We find that monolayers are ferromagnetically ordered below 146 K, an observation enabled by the discovery of a large magnetic dipole SHG effect in the centrosymmetric structure. In multilayers, the ferromagnetic monolayers are coupled antiferromagnetically, and in contrast to other 2D magnets, the Neel temperature of CrSBr increases with decreasing layer number. We identify magnetic dipole and magnetic toroidal moments as order parameters of the ferromagnetic monolayer and antiferromagnetic bilayer, respectively. These findings establish CrSBr as an exciting 2D magnetic semiconductor and extend the SHG probe of magnetic symmetry to the monolayer limit, opening the door to exploring the applications of magnetic-electronic coupling and the magnetic toroidal moment.