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Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 33: Multiferroics II (DF with DS/KR/MA/TT)

MA 33.3: Vortrag

Mittwoch, 18. März 2015, 15:45–16:00, EB 107

Investigation of the antiferromagnetic coupling at SrRuO3 / La0.7Sr0.3MnO3 interfaces — •Sujit Das1,2, Diana Rata1, Andreas Herklotz3, Er Jia Guo4, Robert Roth1, and Kathrin Dörr1,21Institute for Physics, MLU Halle-Wittenberg, 06099 Halle, Germany — 2IFW Dresden, Postfach 270116, 01171 Dresden, Germany — 3Oak Ridge National Lab., Oak Ridge, 37830 TN, USA — 4Affiliation: Institute for Physics, Johannes-Gutenberg University Mainz, 55128 Mainz, Germany

La0.7Sr0.3MnO3/SrRuO3 superlattices grown on piezoelectric substrates show large antiferromagnetic coupling of the two ferromagnetic components and a significant strain effect on interfacial coupling [1]. Here we present a systematic investigation of the antiferromagnetic interface coupling in bilayers of SrRuO3 (SRO) and La0.7Sr0.3MnO3 (LSMO), grown by pulsed laser deposition (PLD) on (100)- oriented SrTiO3 substrates. Epitaxial and coherent growth of the bilayers was confirmed by in-situ RHEED and ex-situ x-ray diffraction (XRD). Magnetic characterization was performed by SQUID magnetometry. We observed a strong dependence of the AFM coupling on the layer sequence and the thickness of the individual layers. The bilayers exhibit exchange bias, with the magnitude and sign of the exchange field strongly dependent on cooling field. Results of this study and ongoing work will be discussed. [1] Sujit Das et al, arXiv:1411.0411

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