Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 18: Magnetic Coupling Phenomena

MA 18.4: Vortrag

Dienstag, 1. April 2014, 14:45–15:00, HSZ 403

Temperature dependent study of the magneto-electric coupling in BiFeO₃/La_0.7Sr_0.3MnO₃ (BFO/LSMO) artificial multiferroic heterostructures by high resolution x-ray microscopy — •S. Finizio¹, C. Mix¹, M. Buzzi², F. Kronast³, F. Nolting², G. Jakob¹, and M. Kläui¹ — ¹Institut für Physik, Johannes Gutenberg Universität, 55128 Mainz, Germany — ²Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland — ³Helmholtz Zentrum für Materialien und Energie GmbH, 12489 Berlin, Germany

Artificial multiferroic systems, where coupling between the ferroelectric and ferromagnetic order is expected, have been object of intense research in the last years. One of such systems is the artificial multiferroic heterostructure BFO/LSMO, which combines BFO (ferroelectric and antiferromagnetic) with LSMO (ferromagnetic), for which an exchange-bias driven coupling, which could allow for the magnetic switching of the LSMO by switching the ferroelectric polarization in the BFO, is expected. In this contribution, a temperature-dependent analysis of the artificial multiferroic heterostructure BFO/LSMO has been carried out with high resolution x-ray microscopy. It was observed that the magnetization of the LSMO layer changes with the temperature, switching from an elongated stripe-like domain structure, typical of LSMO thin films without BFO, to a grain-like domain structure, which resembles the antiferromagnetic domains of the BFO layer. This leads thus to the observation that the BFO layer influences the magnetic structure of the ferromagnetic LSMO.