Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 52: Poster II
MA 52.48: Poster
Donnerstag, 15. März 2018, 15:00–18:00, Poster C
Growth of ferroelectric BaTiO3 thin films on top of a ferromagnetic La0.7Sr0.3MnO3 layer deposited on (001)-oriented SrTiO3 substrate using pulsed laser deposition (PLD) — •Kevin Lancaster, Camillo Ballani, Christoph Hauser, Christian Eisenschmidt, and Georg Schmidt — Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 3, 06120 Halle
The investigation of the tunnelling anisotropic magnetoresistance (TAMR) demands well defined and homogeneous layers of a ferromagnet and a tunnelling barrier [1], ideally grown epitaxially on top of each other. A ferroelectric barrier like BaTiO3 might add additional functionality to TAMR devices. Previous work [2] indicates the discrepancy between a decrease in surface roughness and in-plane tension for BaTiO3 layers thicker than 5 nm on La0.7Sr0.3MnO3 but an ideal tunnelling thickness of less than 4 nm. We present an optimization for thin film pulsed laser deposition of BaTiO3 onto La0.7Sr0.3MnO3 on (001)-oriented SrTiO3 substrates and its characterization by the means of x-ray refraction and deflection, and conductive atomic force microscopy.
[1] J. D. Burton, E. Y. Tsymbal: "Tunneling anisotropic magnetoresistance in a magnetic tunnel junction with half-metallic electrodes", Phys. Rev. B93, 024419, 2016
[2] D. Hansen, R. Plunnecke: "Growth and Strain Relations in (001)-oriented Ferroelectric and Ferromagnetic Perovskite Oxide Thin Films", Institutt for elektronikk og telekommunikasjon, 2013