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 15.3: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
Multiferroic Materials Based on Artificial Thin Film Heterostructures — •S. Geprägs, M. Opel, S.T.B. Goennenwein, and R. Gross — Walther-Meißner-Institut, Bayerische Akademie derWissenschaften, Walther-Meißner-Str. 8, 85748 Garching
Recent advances in the understanding of the coexistence of different ferroic ordering phenomena (such as ferroelectricity and ferromagnetism) triggered a tremendous research activity on so-called multiferroic materials. Unfortunately, only very few multiferroics exist. A promising way to improve the situation is the use of layered thin film heterostructures. The double perovskite Bi2CrFeO6 (BCFO), for example, could be built up from BiFeO3 (BFO) and BiCrO3 (BCO). To realize such superlattices, one must be able to grow unit cell thin BCO and BFO layers in a two-dimensional growth mode. Here, we report the growth of c-axis oriented epitaxial BFO and BCO films by laser molecular beam epitaxy on (001) SrTiO3 substrates. A two-dimensional growth mode could be achieved using an imposed layer-by-layer interval deposition technique. All BCO and BFO thin films show high crystalline quality with a mosaic spread below 0.04∘. Furthermore, reciprocal space maps indicate no monoclinic or rhombohedral distortion up to a film thickness of 35nm. Magnetic measurements demonstrate a weak ferromagnetic phase in both material systems due to spin canting of the antiferromagnetic sublattices. However, we find no evidence of enhanced ferromagnetic properties stemming from epitaxial strain.
This work is supported by the DFG via SPP1157.