Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 6: Complex Magnetic Oxides

MA 6.2: Vortrag

Montag, 5. September 2022, 11:15–11:30, H37

Magneto-optic Kerr effect in ferromagnetic manganite multilayers — •Jörg Schöpf, Paul H.M. van Loosdrecht, and Ionela Lindfors-Vrejoiu — Universität zu Köln, II. Physikalisches Institut, Zülpicherstr. 77, 50937 Köln (DE)

Magnetic functional oxide epitaxial thin films and heterostructures offer a rich variety of physical properties due to lattice mismatch induced strain, interfacial effects and interlayer coupling between different ferromagnetic (FM) layers. The magneto-optic Kerr effect (MOKE) can be used as an indirect probe of the magnetization of a sample. The MOKE of a material is wavelength dependent, and is non-monotonic in the vicinity of MO-active transitions, where the Kerr rotation can change sign and even vanish at particular wavelengths. Knowledge of the wavelength dependence can help to distinguish the contributions of different FM layers within a multilayer to the total measured Kerr effect. Here we present a study on the MOKE of a heterostructure of 10% Ru-doped La0.7Sr0.3MnO3 (LSMRO), where the layers are of different thickness (30 nm bottom layer and a 10 nm top layer), and separated by a NdNiO3 spacer. We found that the measured Kerr hysteresis loops of the heterostructure have an anomalous shape originating from a different sense of rotation of the MOKE from the different LSMRO layers. This can readily be described by Kerr-loops measured on reference samples using the additivity of the MOKE in multilayer systems.