Berlin 2015 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 14: Multiferroics II (DF with DS/KR/MA/TT)

DF 14.3: Talk

Wednesday, March 18, 2015, 15:45–16:00, EB 107

Investigation of the antiferromagnetic coupling at SrRuO₃ / La_0.7Sr_0.3MnO₃ interfaces — •Sujit Das^1,2, Diana Rata¹, Andreas Herklotz³, Er Jia Guo⁴, Robert Roth¹, and Kathrin Dörr^1,2 — ¹Institute 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

La_0.7Sr_0.3MnO₃/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 La_0.7Sr_0.3MnO₃ (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