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MON: Monday Contributed Sessions

MON 12: Quantum Magnets

MON 12.2: Vortrag

Montag, 8. September 2025, 14:30–14:45, ZHG105

Revealing Magnetic Chirality in Non-Collinear Kagome Antiferromagnets through Spin-Seebeck Measurements — •Feodor Svetlanov Konomaev, Mithuss Tharmalingam, and Kjetil Magne Dørheim Hals — Department of Engineering Sciences, University of Agder, 4879 Grimstad, Norway

Non-collinear antiferromagnets (NCAFMs) are attractive for antiferromagnetic spintronics, as they combine the advantages of collinear antiferromagnets with novel emergent phenomena arising from their complex spin textures. One such phenomenon is the intrinsic chirality of the ground-state spin configuration, which strongly influences the spin-wave excitation spectrum. In this work, we investigate an NCAFM with a kagome lattice structure interfaced with a normal metal and demonstrate that the ground-state chirality can be probed via measurements of the spin Seebeck effect (SSE). Starting from a microscopic spin Hamiltonian, we derive the corresponding bosonic Bogoliubov-de Gennes (BdG) Hamiltonians for the distinct chiral configurations. Using linear response theory, we obtain a general expression for the spin current thermally pumped into the normal metal due to the SSE. Our results show that a substantial in-plane spin current arises only when the NCAFM is in the negative chiral state, offering a clear experimental signature for real-time detection of chirality switching in kagome NCAFMs.

Keywords: Spin Seebeck effect; Non-Collinear Kagome Antiferromagnet