Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 52: Poster II

MA 52.48: Poster

Thursday, March 15, 2018, 15:00–18:00, Poster C

Growth of ferroelectric BaTiO₃ thin films on top of a ferromagnetic La_0.7Sr_0.3MnO₃ 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 La_0.7Sr_0.3MnO₃ but an ideal tunnelling thickness of less than 4 nm. We present an optimization for thin film pulsed laser deposition of BaTiO₃ onto La_0.7Sr_0.3MnO₃ 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