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MA: Fachverband Magnetismus
MA 2: Altermagnets I
MA 2.12: Vortrag
Montag, 9. März 2026, 12:30–12:45, HSZ/0004
Multiferroic altermagnet BiFeO3 investigated by DFT+DMFT and XMCD — •Hamza Zerdoumi, Ruiwen Xie, Fu Li, and Hongbin Zhang — Institute of Materials Science, TU Darmstadt, 64287 Darmstadt, Germany
As an emergent magnetic ordering, altermagnets with finite non-relativistic spin splitting exhibit a wide spectrum of fascinating properties. In this work, combining density functional theory (DFT) and dynamical mean-field theory (DMFT), we investigate how such splitting evolves as a function of temperature in BiFeO3. Moreover, by solving the DFT-derived atomic Hamiltonian, we evaluated x-ray magnetic circular dichoism (XMCD) with detailed symmetry analysis, which can be considered as a characteristic feature for altermagnetic ordering. Furthermore, as BiFeO3 is a well-established multiferroic compound, we evaluate the nonlinear transport properties such as shift current originated from the quantum geometry, and further explore how such altermagnetic properties can be tailored by external electric fields.
Keywords: Altermagnetism; DFT+DMFT; x-ray magnetic circular dichroism; BiFeO3; multiferroics