Chen Yiyao, Yumnam George, Guo Jiasen, Stingaciu Laura, Zolnierczuk Piotr, Lauter Valeria, Singh Deepak K
Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211, USA.
Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
iScience. 2021 Feb 18;24(3):102206. doi: 10.1016/j.isci.2021.102206. eCollection 2021 Mar 19.
Emerging new concepts, such as magnetic charge dynamics in two-dimensional magnetic material, can provide novel mechanism for spin-based electrical transport at macroscopic length. In artificial spin ice of single domain elements, magnetic charge's relaxation can create an efficient electrical pathway for conduction by generating fluctuations in local magnetic field that couple with conduction electron spins. In a first demonstration, we show that the electrical conductivity is propelled by more than an order of magnitude at room temperature due to magnetic charge defects sub-picosecond relaxation in artificial magnetic honeycomb lattice. The direct evidence to the proposed electrical conduction mechanism in two-dimensional frustrated magnet points to the untapped potential for spintronic applications in this system.
新兴的新概念，如二维磁性材料中的磁荷动力学，可以为宏观长度上基于自旋的电输运提供新机制。在单畴元素的人工自旋冰中，磁荷的弛豫可以通过产生与传导电子自旋耦合的局部磁场波动来创建有效的导电通路。在首次演示中，我们表明，由于人工磁性蜂窝晶格中磁荷缺陷的亚皮秒弛豫，室温下的电导率提高了一个数量级以上。二维受挫磁体中所提出的导电机制的直接证据表明，该系统在自旋电子学应用方面具有尚未开发的潜力。
