Small-voltage multiferroic control of two-dimensional magnetic insulators
Small-voltage multiferroic control of two-dimensional magnetic insulators
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DOI：
10.1038/s41928-023-00931-1
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发表时间：
2023-03
影响因子：
34.3
通讯作者：
Shanchuan Liang;T. Xie;N. Blumenschein;T. Zhou;Thomas Ersevim;Zhihao Song;Jierui Liang;M. Susner-M.
中科院分区：
文献类型：
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作者：
Shanchuan Liang;T. Xie;N. Blumenschein;T. Zhou;Thomas Ersevim;Zhihao Song;Jierui Liang;M. Susner-M.
磁性绝缘体，具有长程磁序和电绝缘，允许自旋传播而没有电子运动，可用于创建无耗散磁电和磁光器件。原子薄的二维（2D）磁绝缘体可以特别用于制造紧凑的设备。然而，2D磁性绝缘体的有效电控制仍然是一个挑战，这是由于静电掺杂这种绝缘体的困难和外部电场无法修改它们的晶体场。在这里，我们报告的2D磁性绝缘体碲化锗铬（Cr2 Ge 2 Te 6）使用薄铁电聚合物的电气控制。结果表明，在Cr2 Ge 2 Te 6/polymer异质结构上施加±5 V的电压可以打开和关闭磁滞回线。双层、三层和四层结构的Cr2 Ge 2 Te 6薄膜都具有非挥发性的磁调制效应，而较厚的八层结构的Cr2 Ge 2 Te 6薄膜则没有这种磁调制效应，这表明了界面多铁性效应的重要性.异质结构多铁性还使得能够在两个磁化状态之间直接电切换。
Magnetic insulators, which have long-range magnetic order and are electrically insulating, allow spin propagation without electron motion and could be used to create dissipationless magnetoelectric and magneto-optical devices. Atomically thin two-dimensional (2D) magnetic insulators could, in particular, be used to fabricate compact devices. However, the efficient electrical control of 2D magnetic insulators remains a challenge due to difficulties in electrostatically doping such insulators and the inability of external electric fields to modify their crystal fields. Here we report the electrical control of the 2D magnetic insulator chromium germanium telluride (Cr2Ge2Te6) using a thin ferroelectric polymer. We show that ±5 V across the Cr2Ge2Te6/polymer heterostructures can open and close the magnetic hysteresis loop. The magnetic modulation is non-volatile, and is observed in bilayer, trilayer and four-layer Cr2Ge2Te6, but not in thicker eight-layer Cr2Ge2Te6, which indicates the importance of the interfacial multiferroic effect. The heterostructure multiferroics also enable direct electrical toggling between two magnetization states.