Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 31: Poster II
MA 31.41: Poster
Wednesday, March 19, 2025, 17:00–19:30, P1
Mapping of the Morin Transition in alpha-Fe2O3 using Surface Acoustic Waves — •Katharina Lasinger1,2, Florian Kraft1, Yannik Kunz1, Kevin Künstle1, Finlay Ryburn2, John F. Gregg2, and Mathias Weiler1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, RPTU Kaiserslautern-Landau, Germany — 2Clarendon Laboratory, Department of Physics, University of Oxford, United Kingdom
Antiferromagnets (AFMs) hold great potential for applications due to their insensitivity to external magnetic fields, the absence of associated stray fields and and their ability to host fast spin dynamical phenomena [1,2]. While AFMs interact only weakly with external magnetic fields, their magnetic order couples to elastic deformation. We investigate the manipulation of AFMs using magnetoelasticity and demonstrate both the possibility to probe changes in the static magnetization as well as map out the Morin transition of alpha-Fe2O3 through concurrent modification of its elastic properties. To achieve this, surface acoustic waves (SAWs) are launched in an alpha-Fe2O3 | ZnO heterostructure while magnetic field sweeps are performed. We observe significant changes in SAW group velocity and amplitude depending on the angle of the external magnetic field relative to the crystallographic c-axis and the SAW propagation direction. A temperature-dependent study around the Morin transition reveals the critical fields at each temperature required for the antiferromagnetic phase transition to occur.
[1] A. V. Chumak, et al., Nature Physics 11, 453 (2015).
[2] S. M. Rezende, et al., J. Appl. Phys. 126, 151101 (2019).
Keywords: Magnetoelasticity; Antiferromagnets; alpha-Fe2O3 - Hematite; Magnonics; Surface acoustic waves