The altermagnetism with antiparallel spin alignment exhibits anisotropic spin splitting and may possess an insulating state with a high Neel temperature, while the charge-order-induced ferroelectricity has ultrafast electric polarization switching. Considering that altermagnetism requires breaking space inversion,, the physical foundation for exploring ultrafast electrically controlled magnetism in altermagnetic ferroelectric materials is thus established. In this Letter, based on symmetry analysis and first-principles electronic structure calculations, we predict that LiV2F6 is a material that simultaneously hosts altermagnetism and charge-order-induced ferroelectricity. Since both the altermagnetism and ferroelectricity originate from charge order, LiV2F6 should exhibit strong magnetoelectric coupling. Our calculations indeed demonstrate that electric polarization reversal can induce band spin-polarization switching in LiV2F6. Moreover, time-dependent density functional theory calculations show that the electric polarization reversal in LiV2F6 occurs in 15 femtoseconds. Consequently, ultrafast electrically controlled magnetism can be realized in LiV2F6. Given that LiV2F6 has already been experimentally synthesized, our work provides a promising material platform for achieving ultrafast electrically controlled magnetism, which might have significant implications for the design of future electronic devices.
@article{arxiv.2603.22848,
title = {Ultrafast electrically controlled magnetism in charge-order-induced ferroelectric altermagnet},
author = {Yuhao Gu and Yu-Hui Song and Yihao Wang and Ze-Feng Gao and Huan-Cheng Yang and Peng-Jie Guo and Zhong-Yi Lu},
journal= {arXiv preprint arXiv:2603.22848},
year = {2026}
}