Piezoelectric ferromagnetism in two dimensional FeCl₂

2022/04/30 by Kayahan Saritas, Saritas, Kayahan, Sohrab Ismail‐Beigi +1
Engineering · Materials Science · #2D Materials and Applications #Acoustic Wave Resonator Technologies #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Multiferroics and related materials

paper · pdf · doi:10.48550/arxiv.2205.00300

openalex publication_date 2022/04/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We predict that monolayer FeCl₂ is a two-dimensional piezoelectric ferromagnet (PFM) with easy-axis magnetism and a Curie temperature of 260 K. Our ab-initio calculations combined with data mining reveal 2H-FeCl₂ as the only easy-axis 2D monolayer PFM, and that its magnetic anisotropy increases many-fold with moderate hole doping. We develop an analysis based on magnetic anisotropy energy densities that explain the magnetic and doping-dependent behavior of FeCl₂, as well as VSe₂ and CrI₃, and can enable the design of future 2D magnetically ordered materials.

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