Dresden 2026 – scientific programme

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MA: Fachverband Magnetismus

MA 3: Complex Magnetic Oxides

MA 3.8: Talk

Monday, March 9, 2026, 11:30–11:45, POT/0112

Multi-length scale investigation of the Perovskite-Brownmillerite topotactic phase transition in La_0.7Sr_0.3MnO_3−δ thin films — •C. Yin^1,2, X. Bai³, Z. Xu⁴, V. Lauter⁵, S. Zhou⁶, F. Gunkel⁷, L. Cao^2,8, G. Puebla Hellmann⁴, R.E. Dunin-Borkowski³, and O. Petracic^2,1 — ¹Faculty of Mathematics and Natural Sciences, Heinrich Heine University Düsseldorf — ²Jülich Centre for Neutron Science (JCNS-2), JARA-FIT, Forschungszentrum Jülich GmbH — ³Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C), JARA-FIT, Forschungszentrum Jülich GmbH — ⁴QZabre LLC, Zürich, 8050, Switzerland — ⁵Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA — ⁶Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf (HZDR) — ⁷Peter Grünberg Institut (PGI-7), JARA-FIT, Forschungszentrum Jülich GmbH — ⁸School of Advanced Materials, Peking University, Shenzhen Graduate School, Shenzhen, 518055, China

In La_0.7Sr_0.3MnO_3−δ, the introduction of oxygen vacancies induces a topotactic phase transition from the perovskite phase to an oxygen-vacancy ordered Brownmillerite phase. The influence of oxygen vacancies on near-surface magnetic domains is probed via Nitrogen-Vacancy (NV) magnetometry. Polarized Neutron Reflectometry (PNR) provide depth-resolved magnetization profiles and oxygen stoichiometry. Scanning Transmission Electron Microscopy (STEM) elucidates the atomic structure and depth-dependent oxidation states.

Keywords: LSMO; oxygen vacancies; NV magnetometry