报告摘要 | Altermagnets, combining the strengths of ferromagnets and antiferromagnets, have emerged as an exciting platform for next-generation spintronic applications. Integrating (anti)ferroelectricity with altermagnetism results in multiferroic altermagnets, enabling precise manipulation of spin states through electric control of crystal symmetry. In this talk, I will introduce three distinct classes of such multiferroics, tailored for diverse functionalities: antiferroelectric altermagnets [1], ferroelectric altermagnets [2], and noncollinear ferroelectric altermagnets [3], where electric polarization serves as a powerful handle to switch spin splitting on and off, and even to reverse its sign. Our approach combines symmetry analysis and effective models to establish a universal design framework, which we validate through first-principles calculations across diverse material platforms, including van der Waals materials, perovskite oxides, and metal-organic frameworks. These results not only deepen the understanding of magnetoelectric coupling but also open new pathways toward electrically controlled spintronic devices. [1] X. Duan, J. Zhang, and T. Zhou* et al, PRL 134, 106801 (2025). [2] Z. Zhu, X. Duan, and T. Zhou* et al, arXiv: 2504.06258. [3] Z. Zhu, Y. Liu, and T. Zhou* et al, unpublished. |
