Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 34: Functional Antiferromagnetism
MA 34.4: Talk
Thursday, September 8, 2022, 15:45–16:00, H48
Magnon Hanle effect in easy-plane antiferromagnets — •Janine Gückelhorn1,2, Akashdeep Kamra3, Tobias Wimmer1,2, Matthias Opel1, Stephan Geprägs1, Rudolf Gross1,2,4, Hans Huebl1,2,4, and Matthias Althammer1,2 — 1Walther-Meißner-Institut, BAdW, 85748 Garching, Germany — 2Physik-Department, TUM, 85748 Garching, Germany — 3IFIMAC and Departamento de Fisica Teorica de la Materia Condensaga, Universidad Autonoma de Madrid, 28049 Madrid, Spain — 4Munich Center for Quantum Science and Technology, 80799 München, Germany
Antiferromagnets have drawn much attention due to their unique properties and potential for interesting device applications. In analogy to a spin-1/2 system, antiferromagnetic magnon pairs can be described in terms of a magnonic pseudospin. Recently, first experimental observations of the associated dynamics
and the magnon Hanle effect have been reported and described using a 1D pseudospin transport model. Here, we discuss the effects of dimensionality on the magnon spin signal by studying insulating hematite (α-Fe2O3) films with varying thickness [1].
For both a thin and a thick film, we find a pronounced signal caused by the magnon Hanle effect. However, the magnonic spin signal exhibits clear differences in both cases. We extend the theoretical description by taking into account low-energy finite-spin magnons and use it to
explain our observations.
This provides deeper insight into the detailed understanding of magnonic pseudospin dynamics.
[1] J. Gückelhorn et al., Physical Review B 150, 094440 (2022)