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Nano Lett. 2016 Dec 14;16(12):7433-7438. Epub 2016 Nov 14.

Ising-Type Magnetic Ordering in Atomically Thin FePS3.

Author information

1
Department of Physics, Sogang University , Seoul 04107, Korea.
2
Center for Correlated Electron Systems, Institute for Basic Science (IBS) , Seoul 08826, Korea.
3
Department of Physics and Astronomy, Seoul National University (SNU) , Seoul 08826, Korea.
4
Center for Theoretical Physics, Seoul National University (SNU) , Seoul 08826, Korea.

Abstract

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.

KEYWORDS:

FePS3; Ising model; Raman spectroscopy; antiferromagentism; iron phosphorus trisulfide; magnetic ordering in two dimensions

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