Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)
MA 20.1: Poster
Dienstag, 28. März 2006, 15:15–19:15, P1
Preparation and Properties of thin Manganite-Titanate Composite-Films — •Kai Gehrke1, Alexandr Belenchuk2, Oleg Shapoval2, Vasily Moshnyaga1, and Konrad Samwer1 — 11. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen — 2Institute of Applied Physics, Academieis 5, MD-2028 Chisinau, Moldova
Multiferroic materials with coexistence of ferromagnetism and ferroelectricity are in the focus of modern fundamental and applied research. The coupling of these properties is believed to be very strong in nanocomposite films, containing epitaxial co-grown and elastically coupled Manganite and Titanate phases. The strain induced by the piezo effect of the Titanate phase should alter the magnetization of the CMR-Manganite phase. Thin Manganite-Titanate films were grown on MgO and STO substrates by Metalorganic Aerosol Deposition (MAD) technique. Manganites like La-Mn-O, La-Ca-Mn-O, La-Ce-Mn-O and La-Ba-Mn-O where combined with ferroelectric Barium Titanate. XRD, SEM (EDX) and TEM (EELS) where used to study the microstructure of the samples. Measurements of the temperature-dependence of both conductivity and the magnetic moment unveil a MI- and ferro-paramagnetic phase transition of the Manganite-phase. Dielectric spectroscopy in a wide range of frequencies and temperatures is used to determine the ferroelectric properties also in applied magnetic fields.