SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Poster Magnetism I

MA 23.63: Poster

Dienstag, 28. März 2023, 17:00–19:00, P1

Strain engineering M, L and P in antiferromagnetic AFeO₃ films (A = La, Bi) — •Antonia Rieche, Aurora Diana Rata, Wolfgang Hoppe, and Kathrin Dörr — Martin-Luther-Universität Halle-Wittenberg

Magnetization (M), antiferromagnetic order (L) and ferroelectric polarization (P) are ferroic properties which can be probed and potentially also manipulated with light. A major requirement for this is a successful control over the ferroic domain structures in samples, such that a large averaged value of M (L, P) can be reached. Antiferromagnetic ferrites AFeO₃ with weak canted ferromagnetism have revealed fascinating optical properties in bulk (crystal) form, whereas film work is quite limited due to nanoscopic multidomain coexistence in such films. Here, early results of our attempt to optimize such ferrite films for optical experiments are presented. Epitaxial strain controlled by the choice of substrate is employed to direct the structural domain formation in AFeO₃ (A = La or Bi) films in a desirable way regarding the magnitude and orientation of ferroic order parameters. The films are grown using pulsed laser deposition (KrF 248 nm) and characterized by x-ray diffraction, magnetization measurements, magnetooptical Kerr effect (MOKE) and scanning probe microscopies.