SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 41: Focus Session: Altermagnetism: Transport, Optics, Excitations

MA 41.6: Hauptvortrag

Donnerstag, 30. März 2023, 17:00–17:30, HSZ 02

First-principles studies on the anomalous transport properties of ferromagnets, antiferromagnets, and altermagnets — •Wanxiang Feng — School of Physics, Beijing Institute of Technology, Beijing 100081, China

Magnetic topological semimetals bring new vitality to the ideas evolving around the next generation of dissipationless spintronic devices benefiting from their exotic anomalous and spin transport properties. I shall first show that ferromagnetic MF₃ (M = Pd, Mn) are high-quality nodal chain spin-gapless topological semimetals with 100% spin-polarized transport properties. The dominant intrinsic origin is found to originate entirely from the gapped nodal chains without the entanglement of any other trivial bands. The side-jump mechanism is predicted to be negligibly small, but the skew scattering enhances the intrinsic Hall and Nernst signals significantly. Second, I shall present the spin-chirality-dependent anomalous Hall and Nernst effects in coplanar noncollinear antiferromagnets Mn₃XN (X = Ga, Zn, Ag, and Ni) as well as the topological magneto-optical effects and their quantization in noncoplanar antiferromagnets γ-Fe_xMn_1−x and K_0.5RhO₂. Beyond ferromagnetism and antiferromagnetism, altermagnetism is recently discovered to be the third essential magnetic phase. Room-temperature metallic RuO₂ is a typical altermagnet, in which the rearrangement of nonmagnetic atoms induces crystal chirality playing a critical role in anomalous transport properties. Finally, I will discuss the crystal-chirality-dependent anomalous Nernst, anomalous thermal Hall, and magneto-optical effects in RuO₂.