Deng Xiaohui, Li Zhenyu, Yang Jinlong
Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
College of Physics and Electronic Engineering, Hengyang Normal University, Hengyang, Hunan 421002, China.
J Phys Chem Lett. 2020 Sep 17;11(18):7531-7535. doi: 10.1021/acs.jpclett.0c02302. Epub 2020 Aug 26.
Low-dimensional nanostructures are expected to play an important role in spintronics. However, in low-dimensional systems, thermal fluctuations become more significant, which makes long-range magnetic ordering thermodynamically unfavorable. For example, as predicted by the Ising model, 1D magnetic order cannot survive, even at an arbitrary low finite temperature. In this study, utilizing a nanoproximity effect, we design a MoS nanoribbon material to stabilize 1D magnetic order without requiring the explicit application of an external magnetic field. The designed MoS nanoribbon has a new edge-reconstruction pattern, which is much more stable than previously reported structures. As a novel electronic property, one edge is nonmagnetic but conductive, and the opposite edge contains a magnetic moment in the predicted reconstruction pattern. Therefore, a bias voltage can drive a current along the former edge, which then generates a magnetic field at the opposite edge to stabilize the 1D magnetic order there. This result opens a new avenue to realize the integrated electrical control of magnetism.
低维纳米结构有望在自旋电子学中发挥重要作用。然而，在低维系统中，热涨落变得更加显著，这使得长程磁有序在热力学上变得不利。例如，正如伊辛模型所预测的那样，即使在任意低的有限温度下，一维磁有序也无法存在。在本研究中，利用纳米邻近效应，我们设计了一种MoS纳米带材料，无需明确施加外部磁场就能稳定一维磁有序。所设计的MoS纳米带具有一种新的边缘重构模式，它比先前报道的结构稳定得多。作为一种新颖的电子特性，一条边缘是非磁性但导电的，而相对的边缘在预测的重构模式中包含磁矩。因此，偏置电压可以驱动电流沿着前一条边缘流动，然后在相对的边缘产生磁场以稳定那里的一维磁有序。这一结果为实现磁的集成电控制开辟了一条新途径。
