Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 16: Poster I

MA 16.75: Poster

Dienstag, 12. März 2013, 10:30–13:30, Poster D

Temperature Dependent High Resolution Imaging of the Domain Structure of LSMO Thin Films via SEMPA — Robert M. Reeve, •Pascal Krautscheid, Markus König, Christian Mix, Michael Foerster, Gerhard Jakob, and Mathias Kläui — Institut für Physik, Johannes Gutenberg-Universität Mainz, 55699 Mainz, Germany

The domain configuration of 50 nm thick La_0.7Sr_0.3MnO₃ films has been directly investigated using scanning electron microscopy with polarization analysis (SEMPA). The films are grown using pulsed laser deposition and then rapidly transferred ex-situ in a protective environment to the analysis chamber to maintain the cleanliness of the surface. Magnetic imaging is subsequently carried out at variable temperatures in our ultra-high vacuum SEMPA chamber, without the requirement for prior treatment of the surface. We are able to demonstrate a spatial resolution of 20 nm for the magnetic images. The large scale domain structure reflects a primarily uniaxial anisotropy in the films, consistent with previous work [APL 99, 062508 (2011)] and ex-situ measurements using the magneto-optic Kerr effect. The temperature dependence of the image contrast is investigated between 30 K and ambient conditions and compared to the behavior of the magnetization curves obtained from superconducting-quantum interference device (SQUID) magnetometry on the same samples. The SEMPA contrast is observed to decrease faster than the magnetization, which can be explained by the mechanism of the generation of spin polarization (double exchange) in this material.