Dresden 2014 – scientific programme
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MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.102: Poster
Friday, April 4, 2014, 10:30–13:30, P2
Strain and interface effects on magnetic order of La0.7Ca0.3MnO3/SrTiO3 superlattices — •Sujit Das1,2, Andreas Herklotz1,2, Er Jia Guo2,1, and Kathrin Doerr2,1 — 1IFW Dresden, Postfach 270116, 01171 Dresden, Germany — 2Institute for Physics, MLU Halle-Wittenberg, 06099 Halle, Germany
We explore the strain-induced changes of magnetic order in epi- taxially grown [La0.7 Ca0.3 MnO3 (2.6nm)/SrTiO3 (6.3nm)]15 superlat- tices (SLs). SLs are simultaneously grown by Pulsed Laser Deposition (PLD) on (100)-oriented SrTiO3 (STO), LaAlO3 (LAO) and piezo- electric 0.72Pb (Mg1/3Nb2/3)3-0.28PbTiO3 (PMN-PT) substrates in order to obtain different residual strain states. Structural character- ization by X-ray diffraction (XRD) shows coherent growth on STO and non-coherent growth with two different residual strain states of the SLs on LAO and PMN-PT. The La0.7 Ca0.3 MnO3 layers are under increasing tensile strain (ε) from the SL on LAO (ε=1.0%) via that on STO (ε=1.7%) to that on PMNPT (ε=1.8%). Both, Tc and the magnetization decrease with increasing tensile strain. Application of reversible biaxial compression using the PMN-PT substrate reveals the direct strain effect on magnetic order. Comparing the latter with the magnetic data obtained for the three substrates reveals the im- portance of both, the elastic strain and a second parameter related to the interface structure.