Regensburg 2007 – wissenschaftliches Programm

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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 15.12: Poster

Dienstag, 27. März 2007, 15:00–19:00, Poster A

Magnetoelectric effects in Manganite-Titanate Composite Films — •Kai Gehrke, Vasily Moshnyaga, and Konrad Samwer — I.Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

Multiferroic materials with coexistence of ferromagnetism and ferroelectricity are in the focus of modern fundamental and applied research. The coupling of order parameters 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 and vice versa. 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 and La-Sr-Mn-O where combined with ferroelectric Barium Titanate. XRD, AFM and TEM (EELS) where used to study the microstructure of the samples. M(H) and M(T) measurements show the magnetic properties of the manganite phase. Magnetoelectric effects were studied in terms of magnetocapacitance and magnetoloss measurements. The observed magnetocapacitance up to 1600% for H=70 kOe is discussed within CMR, Interface Magnetoresistance and Maxwell-Wagner model (see APL 88, 102902 (2006)). SFB 602 TP A2 is acknowledged.