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MA: Fachverband Magnetismus
MA 8: Altermagnets II
MA 8.11: Vortrag
Montag, 9. März 2026, 17:45–18:00, HSZ/0002
First-principles study on piezomagnetism in altermagnet CoF2 — •Hiroshi Katsumoto1,2, Kunihiko Yamauchi2, and Tamio Oguchi2 — 1Division of Materials and Manufacturing Science, Graduate School of Engineering, The University of Osaka, Suita, Japan — 2Center for Spintronics Research Network, The University of Osaka, Toyonaka, Japan
Altermagnetic materials have recently attracted considerable interest due to their characteristic spin splitting in the absence of spin–orbit coupling (SOC). Among them, CoF2 is notable not only for its altermagnetic band structure but also for its longstanding classification as a piezomagnetic material with large piezomagnetic coefficients [1]. Nevertheless, the microscopic link between its electronic structure and mechanical response has not been fully clarified.
In this study, we investigate the origin of piezomagnetism in CoF2 by means of first-principles calculations. We identify two distinct mechanisms: one driven by SOC-induced anisotropic spin–lattice coupling, and the other emerging from the SOC-independent spin splitting inherent to altermagnetism. By examining how strain influences the electronic states through these mechanisms, we gain new microscopic insights into piezomagnetism in CoF2 and discuss implications for designing functional antiferromagnets with tailored magnetoelastic properties.
This presentation was supported by JSPS KAKENHI Grand Number JP23H05457.
[1] M. Komuro et al., Phys. Rev. B 111, 214445 (2025).
Keywords: Altermagnets; Piezomagnetism; DFT; CoF2