Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 47: Altermagnets V
MA 47.9: Talk
Thursday, March 12, 2026, 17:15–17:30, HSZ/0002
Altermagnetic non-reciprocal magnon transport in insulating d-wave orthoferrites — •Jonas Köhler1, Edgar Galindez-Ruales1, Shixun Cao2, Ulrich Nowak3, Gerhard Jakob1, and Mathias Kläui1 — 1Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany. — 2Materials Genome Institute, Institute of Quantum Science and Technology, International Center for Quantum and Molecular Structures, Shanghai University, 99 Shangda Road, Shanghai, 200444, China. — 3Fachbereich Physik, Universität Konstanz, Universitätsstr. 10, Konstanz, 78457, Germany.
Altermagnetic materials have recently been predicted to host unique magnonic phenomena, including chiral magnon modes, anisotropic magnon lifetimes, and spin transport without additional symmetry breaking by magnetic fields [1].
We present non-local transport in the insulating rare-earth orthoferrites LuFeO3 and YFeO3. We observe a non-zero magnon spin-transport signal for the Spin-Hall-injected magnons, indicating a field-free spin-biased magnon transport. Using thermal excitation via the Spin-Seebeck effect, we observe a strong directional dependence. The signal in the Γ−U direction has the opposite sign from the one in the Γ−U′ direction, while it vanishes along and perpendicular to the easy axis, suggesting a suppression along those crystallographic directions. This shows the altermagnetic spin split magnons, and we can reproduce the observation with an atomistic spin dynamics model.
[1] L. Šmejkal, Phys. Rev. Lett., 2023, 131, 256703.
Keywords: Magnonics; Spin-Transport; Orthoferrite; non-local