Strain-dependent magnetic configurations in manganite-titanate heterostructures probed with soft X-ray techniques

R. Chopdekar (), J. Heidler, C. Piamonteze, Y. Takamura, A. Scholl, S. Rusponi, H. Brune, L. Heyderman and F. Nolting

The European Physical Journal B: Condensed Matter and Complex Systems, 2013, vol. 86, issue 6, 1-7

Abstract: We present a detailed study on the strain-induced magnetic domain structure of a (La,Sr)MnO 3 thin film epitaxially grown on a BaTiO 3 substrate through the use of polarization-dependent X-ray photoemission electron microscopy and X-ray absorption spectroscopy. Angular-dependent measurements allow us to detect vector magnetization on a single-domain scale, and we relate the strain-induced changes in magnetic anisotropy of the ferromagnetic film to the ferroelectric domain structure of the underlying substrate using X-ray magnetic circular and linear dichroism spectro-microscopy. Comparisons to measurements on a nearly strain free film of (La,Sr)MnO 3 grown on a (La,Sr)(Al,Ta)O 3 substrate illustrate that the BaTiO 3 ferroelectric domain structure imprints specific domain sizes and wall orientations in the (La,Sr)MnO 3 /BaTiO 3 artificial multiferroic heterostructure. Furthermore, a change of the BaTiO 3 ferroelectric domain structure either with temperature or with applied electric field results in a corresponding change in the (La,Sr)MnO 3 ferromagnetic domain structure, thus showing a possible route to obtain room-temperature electric field control of magnetic anisotropy at the nanoscale. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Date: 2013
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DOI: 10.1140/epjb/e2013-30995-4

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