Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 38: Multiferroics

MA 38.15: Vortrag

Donnerstag, 26. März 2009, 19:00–19:15, HSZ 103

Strain-coupled multiferroic model system of magnetic films on piezoelectric PMN-PT(001) — •Andreas Herklotz, Diana Rata, Ksenia Boldyreva, Orkidia Bilani-Zeneli, Martina Cornelia Dekker, Ludwig Schultz, and Kathrin Dörr — IFW Dresden, Postfach 270116, 01171 Dresden

In many multiferroic composites the interrelation of magnetic and polar electric properties originates from joined elastic strain of the components. A straightforward model system for quantitative investigations of strain-modulated magnetic properties comprises of magnetic films epitaxially grown on high-strain piezoelectric single crystals [1,2].

In this work, we report on structural, ferroelectric and elastic properties of Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃ (PMN-PT) (001) single crystals utilized as thin film substrates for dynamical strain control of up to 0.25% in complex oxide films [2]. A tunable buffer layer system of solid solutions of perovskite-type LaScO₃ and LaAlO₃ has been developed that serves to adjust the in-plane parameter of buffered PMN-PT in a range of several percent. Thus, various as-grown strain states of a given magnetic film can be prepared and studied under reversible strain. First examples for La_1−xSr_xBO₃ (B = Co or Mn) films under both statically and dynamically varied biaxial strain will be discussed.

[1] C. Thiele et al., PRB 75, 054408 (2007)

[2] M. D. Biegalski, K. Dörr, H. M. Christen (submitted); A. Herklotz et al. (submitted)