SKM 2023 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 18: Functional Antiferromagnetism I

MA 18.4: Vortrag

Dienstag, 28. März 2023, 15:45–16:00, HSZ 02

Long-distance magnon spin transport in Orthoferrites. — •E.F. Galindez-Ruales¹, S. Das¹, X. X. Ma², G. Jakob¹, S. X. Cao², R. Lebrun³, and M. Kläui¹ — ¹Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55128 Mainz, Germany. — ²Department of Physics, Materials Genome Institute, International Center for Quantum and Molecular Structures, Shanghai University, Shanghai 200444, China. — ³Unité Mixte de Physique CNRS, Thales, Université Paris-Saclay, Palaiseau 91767, France.

Antiferromagnets have advantages over ferromagnets, such as terahertz-range magnetization dynamics and stability against external magnetic fields. The efficient transport of spin waves has until now only been observed in the insulating antiferromagnet hematite [1]. In this work [2], we report long-distance spin transport in the antiferromagnetic orthoferrite YFeO₃; although the magnetic damping order is in the same range as hematite, the spin transport is different. At zero magnetic field, the magnon modes in YFeO₃ are linearly polarized, which cannot transport the spin angular momentum. Nevertheless, under an external magnetic field and the presence of DMI, spin information is carried by elliptically polarized modes. We observe a strong anisotropy in the magnon decay lengths that we attributed to the role of the magnon group velocity in the transport of spin waves in antiferromagnets. This unique mode of transport identified in YFeO₃ opens up all the canted antiferromagnets for long-distance spin transport. [1] Lebrun, R., et al. Nat Commun. 11, 6332 (2020). [2] Das, S., et al. Nat. Commun. 13, 6140 (2022).