Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 35: Poster 2
MA 35.35: Poster
Donnerstag, 8. September 2022, 16:00–18:00, P4
Magnetization dynamics of γ-Fe2O3 thin films with reduced effective magnetization — •Monika Scheufele1,2, Manuel Müller1,2, Janine Gückelhorn1,2, Luis Flacke1,2, Andreas Haslberger1,2, Mathias Weiler3, Hans Huebl1,2,4, Stephan Geprägs1, Rudolf Gross1,2,4, and Matthias Althammer1,2 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Physik-Department, Technische Universität München, Garching, Germany — 3Fachbereich Physik und Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Kaiserslautern, Germany — 4Munich Center for Quantum Science and Technology (MCQST), München, Germany
Magnetic insulators (MI) are of key importance in the emerging fields of magnonics and spin-caloritronics. In this respect, the room-temperature MI γ-Fe2O3 is a promising candidate offering a variety of application perspectives. Here, we report on the static and dynamic magnetic properties of pseudomorphic-grown γ-Fe2O3 thin films on MgO (001). We find a strain-induced small effective magnetization Meff, showing a sign change at 200 K. In addition, we also observe the impact of slowly relaxing impurities to the ferromagnetic resonance (FMR) field and the linewidth as a function of temperature. Moreover, above 150 K we detect an increase of the FMR linewidth, which we attribute to valence-exchange damping induced by Fe2+-ions in γ-Fe2O3 [1].
[1] M. Müller et al., arXiv:2204.11498.