Dresden 2017 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 9: Poster Session

DF 9.30: Poster

Dienstag, 21. März 2017, 14:00–16:00, P1C

Exchange coupling in multiferroic Bi_1−xBa_xFeO₃/ferromagnet heterostructures — •Sven Becker, Mehran Vafaee, Mathias Kläui, and Gerhard Jakob — Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany

The BiFeO₃/ferromagnet interface has been target of numerous researches. The effect of exchange coupling was often weak at room temperature ^[1] or dies after some time because of oxidation of the interface^[2]. Multiferroic Bi_1−xBa_xFeO₃/ferromagnet heterostructures have been fabricated using pulsed laser deposition (PLD). The focus laid on Bi_0.75Ba_0.15FeO₃(BB15FO), which promises to have a larger magnetic moment than undoped BiFeO₃ (BFO).^[3] As ferromagnetic layers La_0.7Sr_0.3MnO₃ and ferrimagnetic Sr₂FeMoO₆ have been deposited. Single crystal growth has been confirmed using XRD. Ferroelectric properties of BB15FO have been proven by piezoresponse force microscopy (PFM). Heterostructures have been investigated with regard to the exchange coupling using a SQUID magnetometer. [1] M. Vafaee Appl. Phys. Lett. 108, 072401 (2016) [2] J. T. Heron, Nature 516, 370 (2014) [3] R. Das, J. Magn. Magn. Mater. 324, 1913 (2012)