Switching 2D magnetic states via pressure tuning of layer stacking
Switching 2D magnetic states via pressure tuning of layer stacking
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DOI：
10.1038/s41563-019-0505-2
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发表时间：
2019-12-01
期刊：
影响因子：
41.2
通讯作者：
Xu, Xiaodong
中科院分区：
文献类型：
--
作者：
Song, Tiancheng;Fei, Zaiyao;Xu, Xiaodong
二维范德华晶体的物理性质对层间耦合非常敏感。对于二维磁体（1-3），理论表明层间交换耦合强烈依赖于层间分离，而堆叠排列甚至可以改变层间磁交换的符号，从而极大地改变基态（4-10）。在这里，我们展示了二维磁体CrI3中磁序的压力调谐。我们使用隧道（8,21-13）和扫描磁圆二色显微镜测量(2)来探测磁态。我们发现静水压力可以使层间磁耦合增加一倍以上。在双层CrI3中，压力诱导层状反铁磁相向铁磁相转变。在三层CrI3中，压力可以形成一个铁磁性和两个反铁磁性的三相共存畴。观察到的磁序变化可以用堆积排列的变化来解释。堆积顺序和磁性之间的这种耦合为设计磁相和功能提供了充分的机会。
The physical properties of two-dimensional van der Waals crystals can be sensitive to interlayer coupling. For two-dimensional magnets(1-3), theory suggests that interlayer exchange coupling is strongly dependent on layer separation while the stacking arrangement can even change the sign of the interlayer magnetic exchange, thus drastically modifying the ground state(4-10). Here, we demonstrate pressure tuning of magnetic order in the two-dimensional magnet CrI3. We probe the magnetic states using tunnelling(8,21-13) and scanning magnetic circular dichroism microscopy measurements(2). We find that interlayer magnetic coupling can be more than doubled by hydrostatic pressure. In bilayer CrI3, pressure induces a transition from layered antiferromagnetic to ferromagnetic phase. In trilayer CrI3, pressure can create coexisting domains of three phases, one ferromagnetic and two antiferromagnetic. The observed changes in magnetic order can be explained by changes in the stacking arrangement. Such coupling between stacking order and magnetism provides ample opportunities for designer magnetic phases and functionalities.