论文标题
范德华异质结构中的人工多表情和增强的磁电效应
Artificial Multiferroics and Enhanced Magnetoelectric Effect in van der Waals Heterostructures
论文作者
论文摘要
具有耦合铁电和铁磁特性的多效材料对于多功能设备而言，由于其通过电场控制磁性的潜在能力，反之亦然。最近发现的二维铁磁和铁电材料的发现引发了巨大的研究兴趣，并引起了人们寻找二维多效应的希望。然而，固有的二维多效材料，特别是那些具有强磁电耦合的材料仍然很少见。在本文中，使用第一原理模拟，我们通过由铁磁双层三碘化物（CRI3）和铁电单层sc2co2形成的范德华异源二维多色素。除了铁磁性和铁电性的共存外，我们的计算还表明，通过切换SC2CO2的电化极化，我们可以调整双层cri3的层间磁耦合，而在铁磁和抗磁性状态之间。我们进一步揭示了这种强大的磁电效应是由于SC2CO2中强大的电力极化引起的带对齐的急剧变化以及随后的双层CRI3的层间磁耦合的变化。这些人工多表情和增强的磁电效应会导致实现范德华异质结构的多功能纳米电子学。
Multiferroic materials with coupled ferroelectric and ferromagnetic properties are important for multifunctional devices due to their potential ability of controlling magnetism via electric field, and vice versa. The recent discoveries of two-dimensional ferromagnetic and ferroelectric materials have ignited tremendous research interest and aroused hope to search for two-dimensional multiferroics. However, intrinsic two-dimensional multiferroic materials and, particularly, those with strong magnetoelectric couplings are still rare to date. In this paper, using first-principles simulations, we propose artificial two-dimensional multiferroics via a van der Waals heterostructure formed by ferromagnetic bilayer chromium triiodide (CrI3) and ferroelectric monolayer Sc2CO2. In addition to the coexistence of ferromagnetism and ferroelectricity, our calculations show that, by switching the electric polarization of Sc2CO2, we can tune the interlayer magnetic couplings of bilayer CrI3 between ferromagnetic and antiferromagnetic states. We further reveal that such a strong magnetoelectric effect is from a dramatic change of the band alignment induced by the strong build-in electric polarization in Sc2CO2 and the subsequent change of the interlayer magnetic coupling of bilayer CrI3. These artificial multiferroics and enhanced magnetoelectric effect give rise to realizing multifunctional nanoelectronics by van der Waals heterostructures.
