2D Intrinsic Ferromagnets from van der Waals Antiferromagnets
2D Intrinsic Ferromagnets from van der Waals Antiferromagnets
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DOI：
10.1021/jacs.7b12976
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发表时间：
2018-02-21
影响因子：
15
通讯作者：
Sun, Zhimei
中科院分区：
文献类型：
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作者：
Miao, Naihua;Xu, Bin;Sun, Zhimei
固有铁磁性二维半导体对于纳米级自旋电子学是必不可少的，也是备受关注的，但它们只能从铁磁性体晶体中获得，而从体反铁磁体中制造二维固有铁磁体的可能性仍然未知。本文在从头计算的基础上，我们证明了这一可行性，并发现了一类新兴的单层二维半导体CrOX （CrOCI和CrOBr单层）的本征铁磁性，其具有强大的铁磁性有序，大自旋极化和高居里温度。这些二维晶体具有良好的动力学和热稳定性，并且易于从其块状反铁磁体中进行实验制造。二维CrOCI的居里温度为160 K，超过了研究最多的稀磁性GaMnAs材料的记录（155 K），并且可以通过适当的应变进一步提高。我们的研究提供了另一种有前途的方法，可以从反铁磁体中生成二维固有铁磁体，并为未来的自旋电子学提供了二维CrOX单层的良好平台。
Intrinsically ferromagnetic 2D semiconductors are essential and highly sought for nanoscale spintronics, but they can only be obtained from ferromagnetic bulk crystals, while the possibility to create 2D intrinsic ferromagnets from bulk antiferromagnets remains unknown. Herein on the basis of ab initio calculations, we demonstrate this feasibility with the discovery of intrinsic ferromagnetism in an emerging class of single-layer 2D semiconductors CrOX (CrOCI and CrOBr monolayers), which show robust ferromagnetic ordering, large spin polarization, and high Curie temperature. These 2D crystals promise great dynamical and thermal stabilities as well as easy experimental fabrication from their bulk antiferromagnets. The Curie temperature of 2D CrOCI is 160 K, which exceeds the record (155 K) of the most-studied dilute magnetic GaMnAs materials, and could be further enhanced by appropriate strains. Our study offers an alternative promising way to create 2D intrinsic ferromagnets from their antiferromagnetic bulk counterparts and also renders 2D CrOX monolayers great platform for future spintronics.