Huang Chengxi, Zhou Jian, Sun Huasheng, Wu Fang, Hou Yusheng, Kan Erjun
MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing and Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, China.
Center for Alloy Innovation and Design, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China.
Nano Lett. 2022 Jul 13;22(13):5191-5197. doi: 10.1021/acs.nanolett.2c00930. Epub 2022 May 31.
Electrical control of magnetic order in van der Waals (vdW) two-dimensional (2D) systems is appealing for high-efficiency and low-dissipation nanospintronic devices. For realistic applications, a vdW 2D material with ferromagnetic (FM) and ferroelectric (FE) orders coexisting and strongly coupling at room temperature is urgently needed. Here we present a potential candidate for nonvolatile electric-field control of magnetic orders at room temperature. Using first-principles calculations, we predict the coexistence of room-temperature FM and FE orders in a 2D transition metal carbide, where the spatial distribution of magnetic moments strongly couples with the orientation of out-of-plane electric polarization. Furthermore, an electric-field switching between interfacial FM and ferrimagnetic orders is realizable through constructing a multiferroic vdW heterostructure based on this material. These findings make a significant step toward realizing room-temperature multiferroicity and strong magnetoelectric coupling in 2D materials.
在范德华（vdW）二维（2D）系统中，对磁序进行电控制对于高效低耗散的纳米自旋电子器件具有吸引力。对于实际应用而言，迫切需要一种在室温下铁磁（FM）和铁电（FE）序共存且强耦合的vdW二维材料。在此，我们展示了一种在室温下对磁序进行非易失性电场控制的潜在候选材料。通过第一性原理计算，我们预测在一种二维过渡金属碳化物中存在室温FM和FE序的共存，其中磁矩的空间分布与面外电极化的取向强烈耦合。此外，通过基于这种材料构建多铁性vdW异质结构，可实现界面FM和亚铁磁序之间的电场切换。这些发现朝着在二维材料中实现室温多铁性和强磁电耦合迈出了重要一步。
