Regensburg 2022 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 10: Focus session: Polar Materials Meet Energy demands
KFM 10.4: Hauptvortrag
Dienstag, 6. September 2022, 11:15–11:45, H5
Magnetization processes in SmFeO3 — •Thomas Schrefl1, Alexander Kovacs1, Roman Beigelbeck1, Hubert Brückl1, Shixun Cao2, and Wei Ren2 — 1Department for Integrated Sensor Systems, Danube University Krems, Viktor Kaplan Straße 2E, 2700 Wiener Neustadt, Austria — 2Department of Physics, Shanghai University, China
SmFeO3 is an antiferromagnet with a canted spin structure. We analyzed the basic magnetic properties of monocrystalline SmFeO3 samples through magnetic measurements and micromagnetic simulations. The measurements of the temperature dependent magnetization confirm a spin reorientation at 181∘C. Hysteresis properties were found to depend on the magnetic history. We observed exchange bias at room temperature whereby the bias field is sensitive on and increases with the field which is applied after field cooling. Using the double sublattice weak ferromagnetic model we derived effective intrinsic material properties for micromagnetic simulations. The simulations show the existence of metastable multidomain states. In SmFeO3 ferroelectricity is believed to arise from antiferromagnetic domain walls. In a phenomenological model, in which the electric polarization arises from the noncollinear magnetization distribution in the domain walls, the average electric polarization is directly proportional to the total number of domain walls. We show how the number of antiferromagnetic domain walls and the electric polarization changes with the applied magnetic field.
Work supported by The Austrian Research Promotion Agency (FFG) project 20087207, MagnifiSense.