Tuning of ferroic phases provides great opportunities for material functionalities, especially in two-dimensional materials. Here, a 4f rare-earth carbide Gd2C monolayer is predicted to be ferromagnetic metal with large magnetization, inherited from its bulk property. Based on first-principles calculations, we propose a strategy that the surface passivation can effectively tune its ferroicity, namely switching among ferromagnetic, antiferromagnetic, and ferroelectric phases. Metal-insulator transition also occurs accompanying these ferroic transitions. Our calculation also suggests that the magneto-optic Kerr effect and second harmonic generation are effective methods to monitor these phase transitions.
@article{arxiv.2312.04011,
title = {Oxidation tuning of ferroic transitions in Gd$_2$C monolayer},
author = {Xinyu Yang and Shuai Dong},
journal= {arXiv preprint arXiv:2312.04011},
year = {2024}
}