Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 19: POSTER Ia

MA 19.60: Poster

Dienstag, 17. März 2015, 09:30–13:00, Poster A

Control of stoichiometry in LaMnO3/La2MnO4 thin films grown by pulsed laser deposition — •Arun Singh Chouhan1,2, Supratik Dasgupta1, Vikas Shabadi1, Aldin Radetinac1, Philipp Komissinskiy1, Ajay D Thakur2, and Lambert Alff11Institute of Materials Science, Technische Universität Darmstadt, Alarich-Weiss-Strasse 2, 64287 Darmstadt — 2Department of Physics, Indian Institute of Technology Patna, India

Growth of perovskites (ABO3) by pulsed laser deposition (PLD) requires a simultaneous precise control of multiple process parameters. In particular, the interplay between laser fluence, growth atmosphere, and pressure affects the stoichiometry and, thereby, also the physical properties of compounds such as LaMnO3 where the B-site cation is known to have multiple stable oxidation states. Although stoichiometric bulk LaMnO3 is an A-type antiferromagnetic insulator, several independent studies have reported a ferromagnetic order in thin films, attributed to an off-stoichiometry driven double exchange interaction between the mixed Mn3+ and Mn4+ oxidative states. In spite of repeated efforts, as grown thin films with magnetic saturation below ∼0.4 µB/f.u. have so far not been reported. Here, we present a systematic growth study with a fine control of cation stoichiometry and oxidation state, allowing to stabilize LaMnO3 (with Mn3+) and La2MnO4 (with Mn2+) from the same target by choosing the appropriate deposition conditions.

100% | Bildschirmansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2015 > Berlin