Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 46: Poster II

MA 46.22: Poster

Donnerstag, 21. März 2024, 15:00–18:00, Poster C

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

Ferroic properties such as magnetization (M), antiferromagnetic order (L) and ferroelectric polarization (P) can be studied and potentially manipulated with light. An essential prerequisite for this is a successful control of the ferroic domain structures, so that a large mean value of M (L, P) can be achieved. Antiferromagnetic ferrites AFeO₃ with weak canted ferromagnetism have shown intriguing optical properties in bulk single crystal, while work on thin films is quite limited due to nanoscopic multidomain coexistence. Here we present results of our attempt to optimize BiFeO₃ and LaFeO₃ layers for optical experiments. The epitaxial strain controlled by the choice of substrate is used to achieve the formation of structural domains in these ferrite layers in a desirable way. Defined structural domain patterns allow selected orientations and sizes of M, L and P. The films are grown using pulsed laser deposition (KrF 248 nm) and characterized by x-ray diffraction, magnetooptical Kerr effect and scanning probe microscopies.

Keywords: Strain engineering; Ferroelectric; BiFeO3; LaFeO3