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MA: Fachverband Magnetismus
MA 13: Altermagnets II
MA 13.9: Vortrag
Dienstag, 18. März 2025, 11:45–12:00, H20
Ferroelectric Switchable Altermagnetism — Mingqiang Gu1, Yuntian Liu1, Haiyuan Zhu1, Kunihiro Yananose2, Xiaobing Chen1, Yongkang Hu1, •Alessandro Stroppa3, and Qihang Liu1 — 1Department of Physics and Guangdong Basic Research Center of Excellence for Quantum Science, Southern University of Science and Technology, Shenzhen 518055, China — 2Korea Institute for Advanced Study, Seoul 02455, Republic of Korea — 3CNR-SPIN - Via Vetoio - 67100 - Coppito (AQ), Italy.
We propose a novel ferroelectric switchable altermagnetism effect, by synergistically correlating the switching of ferroelectric polarization and the altermagnetic spin splitting. We demonstrate the design principles for the ferroelectric altermagnets and the further symmetry constraints for switching the altermagnetic spin splitting through flipping the electric polarization based on the state-of-the-art spin-group symmetry techniques. 22 ferroelectric altermagnets are found by screening through the 2001 experimental reported magnetic structures in the MAGNDATA database and 2 of them are identified as ferroelectric switchable altermagnets. Using the hybrid improper ferroelectric material [C(NH2)3]Cr(HCOO)3 as an example, we show how the altermagnetic spin splitting is tightly coupled to the ferroelectric polarization, providing an ideal platform for designing electric-field-controllable multiferroic devices. Finally, we find that such manipulation of altermagnetism can be detected by monitoring the physical quantities that are related to the non-vanishing Berry curvature dipole, such as the linearly polarized photogalvanic spin current.
Keywords: altermagnetism; ferroelectricity; hybrid organc-inorganic perovskites; metal-organic frameworks; multiferroicity