Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 79: Experimental methods

O 79.3: Vortrag

Donnerstag, 29. März 2012, 16:30–16:45, A 060

Development of a stress measurement for pulsed laser deposition of BaTiO₃ — •Jörg Premper, Dirk Sander, and Jürgen Kirschner — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle

The structural analysis of BaTiO₃ monolayers on Fe(001) reveals unexpected structural relaxations near the interface and a minimum thickness for polarisation was deduced from theory to be 2 unit cells [1]. Structural relaxation and onset of polarization are expected to induce characteristic signatures of both interface and film stress of this system. To measure these stresses, we set up an optical 2-beam crystal curvature measurement, which allows stress measurements during pulsed laser deposition of BaTiO₃. We use a scanning mirror for the homogeneous ablation of the BaTiO₃ target to avoid a rotary UHV-feedthrough of a rotating target. First results on the stress measurements during PLD of BaTiO₃ are presented, which indicate the feasibility of reliable stress measurements. This is a comforting result in view of the plasma bloom of the ablation process hitting the thin crystal, where one might have expected a detrimental disturbance on the optical curvature measurement.

[1] H.L. Meyerheim, F. Klimenta, A. Ernst, K. Mohseni, S. Ostanin, M. Fechner, S. Parihar, I.V. Maznichenko, I. Mertig and J Kirschner: Phys. Rev. Lett. 106 (2011), 087203