Regensburg 2013 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 22: Poster II

DF 22.21: Poster

Freitag, 15. März 2013, 10:30–13:30, Poster D

Magnetic anisotropy of strained La0.7Sr0.3CoO3 thin films probed by XMCD — •Peter Nagel¹, Michael Merz¹, Felix Eilers^1,2, Dirk Fuchs¹, Hilbert von Löhneysen^1,3, and Stefan Schuppler¹ — ¹KIT, Institut für Festkörperphysik — ²KIT, Fakultät für Physik — ³KIT, Physikalisches Institut, Karlsruhe, Germany

The magnetic properties of perovskite-type La1-xSrxCoO3 have their origin in the variety of possible valence and spin states of the Co ion and in strong electronic correlations. Bulk La0.7Sr0.3CoO3 is known to be a ferromagnetic metal below Tc=240 K and to exhibit large Joule magnetostriction. This motivated us to investigate a complementary magnetoelastic effect: the effect of biaxial strain on the magnetization. La0.7Sr0.3CoO3 thin films were grown on lattice-mismatched substrates (LaAlO3 , SrTiO3, MgO and LSAT) by pulsed laser deposition. X-ray diffraction confirmed the films to be subjected to compressive or tensile strain, respectively. Near-edge x-ray absorption fine structure (NEXAFS) and x-ray magnetic circular dichroism (XMCD) at the Co L2,3 edge and the O K edge provided spectroscopic information on the electronic and magnetic structure. Sum rules were used to extract magnetic moments from the XMCD spectra. The difference between in-plane and out-of-plane magnetic moments was found to vary with the biaxial strain. We gratefully acknowledge the Max Planck Institute for Intelligent Systems (E. Goering, T. Tietze, G. Schütz) for the use of their XMCD end station and the synchrotron light source ANKA for the provision of beam time.