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MA: Fachverband Magnetismus

MA 10: Poster I

MA 10.26: Poster

Dienstag, 23. März 2010, 10:45–13:45, Poster A

Giant magnetic anisotropy changes in Sr₂CrReO₆ thin films on BaTiO₃ — •Franz D. Czeschka, Stephan Geprägs, Matthias Opel, Sebastian T.B. Goennenwein, and Rudolf Gross — Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany

The integration of ferromagnetic and ferroelectric materials into hybrid heterostructures leads to systems with improved or even novel functionality. We here discuss the properties of the ferromagnetic double perovskite Sr₂CrReO₆, deposited as a thin film onto ferroelectric BaTiO₃ single crystal substrates via pulsed laser deposition. High resolution x-ray diffraction evidences the high crystalline quality of the epitaxial Sr₂CrReO₆ layers. Temperature dependent electrical transport and SQUID measurements show abrupt changes both in resistivity and magnetization at the temperatures of the BaTiO₃ phase transitions. Furthermore, the coercive field abruptly changes by more than 1.2 T at the BaTiO₃ phase transitions. These observations reveal a giant change of the magnetic anisotropy in the Sr₂CrReO₆ thin film associated with the crystalline phase transitions of the substrate. We attribute these effects to the high sensitivity of the double perovskites to mechanical deformation.

Financial support by the DFG via SPP 1157 and 1285, GO 944/3 and the Excellence Cluster “Nanoinitiative Munich” is greatfully acknowledged.

F. Czeschka et al., Appl. Phys. Lett. 95, 062508 (2009)

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