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MA: Fachverband Magnetismus

MA 36: Molecular Magnetism and Magnetic Particles / Clusters I

MA 36.6: Vortrag

Mittwoch, 11. März 2026, 16:15–16:30, POT/0151

Metal-free magnetism and organic 2D crystals — •Hongde Yu and Thomas Heine — TU Dresden, Dresden, Germany

Organic 2D crystals with metal-free magnetism have attracted considerable research interest owing to their promising applications in organic spintronics and quantum information technologies. However, achieving stable spin-polarization and controlling magnetic interactions in these systems remains challenging due to strong electronic coupling and the closed-shell nature of most organic monomers. In this talk, I will present a strategy to induce spin-polarization and tailor magnetic interactions in organic 2D crystals. By assembling triangulene monomers into dimers and extended 2D polymers, we theoretically explore strategies to control magnetic interactions and electronic structures. We showed substantial magnetic coupling (J) up to -198 meV through rational chemical design of triangulene dimers. Furthermore, triangulene-based 2D crystals exhibit unique electronic features, including a Dirac point flanked by twin flat bands. By tuning the Fermi level, we predict metal-free ferromagnetism with Curie temperatures of ~260 K and half-metallic behavior. Furthermore, we proposed a mixed-topology design strategy enabling purely organic 2D FM semiconductors with J values up to 127 meV and Curie temperatures exceeding 500 K. Beyond conventional FM and AFM, I will also present a simple approach to achieve metal-free altermagnetism.

Keywords: oraganic magnets; triangulene; first-principles calculation; nanographenes