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arXiv 1802.07355cond-mat.mtrl-sci
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通过静电掺杂控制二维CrI3的磁性

Controlling magnetism in 2D CrI3 by electrostatic doping

Shengwei Jiang, Lizhong Li, Zefang Wang, Kin Fai Mak, Jie Shan

摘要:

二维(2D)材料的原子厚度提供了一个独特的机会,通过静电掺杂来控制材料性能和设计新的功能。静电掺杂已经被证明可以在很宽的范围内调节2D材料的电学和光学性质,以及驱动电子相变。最近发现的原子级薄的磁性绝缘体开辟了电控制磁和具有前所未有的性能的新器件的前景。在这里,我们展示了单层和双层碘化铬的磁性控制静电掺杂使用双栅场效应器件结构。在单层CrI3,掺杂显着修改的饱和磁化强度,矫顽力和居里温度,表现出增强(减弱)磁序与空穴(电子)掺杂。值得注意的是,在双层CrI3掺杂急剧改变层间磁秩序,导致从反铁磁基态在原始形式的铁磁基态以上的临界电子密度的过渡。结果表明,强烈的掺杂依赖的层间交换耦合,这使得在双层CrI3的磁化强度的小的栅极电压的鲁棒切换。

英文摘要:

The atomic thickness of two-dimensional (2D) materials provides a unique opportunity to control material properties and engineer new functionalities by electrostatic doping. Electrostatic doping has been demonstrated to tune the electrical and optical properties of 2D materials in a wide range, as well as to drive the electronic phase transitions. The recent discovery of atomically thin magnetic insulators has opened up the prospect of electrical control of magnetism and new devices with unprecedented performance. Here we demonstrate control of the magnetic properties of monolayer and bilayer CrI3 by electrostatic doping using a dual-gate field-effect device structure. In monolayer CrI3, doping significantly modifies the saturation magnetization, coercive force and Curie temperature, showing strengthened (weakened) magnetic order with hole (electron) doping. Remarkably, in bilayer CrI3 doping drastically changes the interlayer magnetic order, causing a transition from an antiferromagnetic ground state in the pristine form to a ferromagnetic ground state above a critical electron density. The result reveals a strongly doping-dependent interlayer exchange coupling, which enables robust switching of magnetization in bilayer CrI3 by small gate voltages.

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