Regensburg 2007 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.1: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
Dynamic strain in epitaxial ferroic oxide films — •Orkidia Bilani, Martina Dekker, Christian Thiele, Kathrin Dörr, Konstantin Nenkov, and Ludwig Schultz — IFW Dresden, Postfach 270116, 01171 Dresden, Germany
Epitaxial strain is known or theoretically predicted to essentially influence the electronic properties of transition metal perovskite oxides like (Ba,Sr)TiO3. One approach for reversible biaxial strain variation in epitaxial films fitting to a pseudocubic lattice parameter of about 4.0 Angstrom is the utilization of a ferro- and piezoelectric PMN-PT(001) substrate. (PMN-PT stands for 0.72PbMg1/3Nb2/3O3-0.28PbTiO3.) The huge, homogeneous and nearly linear piezoelectric strain of PMN-PT(001) allows one to biaxially compress as-grown films by about 0.2 % by applying an electric voltage.
In this contribution, the structural properties of PMN-PT(001) substrates and of epitaxial perovskite films of SrTiO3 and ferromagnetic manganites R1−xAxMnO3 (R = rare earth metal or La, A = doping metal) grown on them are analysed. Atomic force microscopy and methods of four-circle x-ray diffraction have been employed for the measurements. Electric and magnetic properties like the ferroic ordering temperature as a direct function of the biaxial strain varied in-situ have been recorded and are discussed.