2016/08/31 by Jae-Ung Lee, Sungmin Lee, Ji Hoon Ryoo +6 · 3 citations
Physics and Astronomy · #cond-mat.mes-hall
paper · pdf · doi:10.1021/acs.nanolett.6b03052
published as Nano Letters, 16 (12), 7433-7438 (2016) · 20 pages, 4 figures in manuscript and 22 pages, 18 figures in supporting information
arxiv created 2016/11/09 · arxiv updated 2017/01/26
Magnetism in two-dimensional materials is not only of fundamental scientific interest but also a promising candidate for numerous applications. However, studies so far, especially the experimental ones, have been mostly limited to the magnetism arising from defects, vacancies, edges or chemical dopants which are all extrinsic effects. Here, we report on the observation of intrinsic antiferromagnetic ordering in the two-dimensional limit. By monitoring the Raman peaks that arise from zone folding due to antiferromagnetic ordering at the transition temperature, we demonstrate that FePS3 exhibits an Ising-type antiferromagnetic ordering down to the monolayer limit, in good agreement with the Onsager solution for two-dimensional order-disorder transition. The transition temperature remains almost independent of the thickness from bulk to the monolayer limit with TN ~118 K, indicating that the weak interlayer interaction has little effect on the antiferromagnetic ordering.