Raman spectroscopy of atomically thin two-dimensional magnetic iron phosphorus trisulfide (FePS3) crystals

• Main Authors: Wang, Xingzhi, Du, Kezhao, Liu, Fredrik Yu Yang, Hu, Peng, Zhang, Jun, Zhang, Qing, Owen, Samuel Man Hon, Lu, Xin, Gan, Chee Kwan, Sengupta, Pinaki, Kloc, Christian, Xiong, Qihua
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2020
• Subjects: Science::Physics; Iron Phosphorus Trisulfide (FePS3); Two-dimensional Materials
• Online Access: https://hdl.handle.net/10356/140455
• Institution: Nanyang Technological University

Metal phosphorous trichalcogenide is an important group of layered two-dimensional (2D) materials with potentially diverse applications in low-dimensional magnetic and spintronic devices. Herein we present a comprehensive investigation on the lattice dynamics and spin–phonon interactions of mechanically exfoliated atomically thin 2D magnetic material—iron phosphorus trisulfide (FePS3) by Raman spectroscopy and first principle calculations. Layer-number and temperature dependent Raman spectroscopy suggests a magnetic persistence in FePS3 even down to monolayer regime through the spin–phonon coupling, while the Néel temperature decreases from 117 K in bulk to 104 K in monolayer sample. Our studies advocate the intriguing magnetic properties in 2D crystals and suggest that FePS3 is a promising candidate material for future magnetic applications.