Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster II - Magnetic Heusler compounds, Magnetic shape memory alloys, Thin Films, Micro-/Nano-structured magnetic materials, Graphene, Spins in organics, Magnetic imaging, Surface Magnetism, Spin excitations/Torque, Spincaloric transport

MA 52.35: Poster

Freitag, 30. März 2012, 11:00–14:00, Poster A

Rolled-up tubes and cantilevers from magnetic SrRuO₃-Pr_0.7Ca_0.3MnO₃ films — Christoph Deneke^1,4, •Kathrin Dörr², Elisabeth Wild³, Stefan Baunack³, Angelo Malachias⁴, and Oliver Schmidt³ — ¹Laboratorio Nacional de Nanotecnologia, Caixa Postal 6192, Campinas, S.P., Brazil — ²MLU Halle-Wittenberg, Halle, Germany — ³Institute for Integrative Nanosciences, IFW Dresden, Dresden, Germany — ⁴Laboratorio Nacional de Luz Sincrotron, Caixa Postal 6192, Campinas, S.P., Brazil

Three-dimensional microobjects are fabricated by the controlled release of inherently strained SrRuO₃/Pr_0.7Ca_0.3MnO₃/SrRuO₃ trilayers from SrTiO₃(001) substrates. Cantilevers and rolled-up microtubes with a diameter of 6-8 µm are demonstrated. The etching behavior of the SrRuO₃ film is investigated and a selectivity of 1:9100 with respect to the SrTiO₃ substrate is found. The initial and final strain states of the rolled-up oxide layers are studied by x-ray diffraction on an ensemble of tubes. Relaxation of the sandwiched Pr_0.7Ca_0.3MnO₃ layer towards its bulk lattice parameter is observed as the major driving force for the roll-up of the trilayers. Finally, microdiffraction experiments reveal that a single object can represent the ensemble proving a good homogeneity of the rolled-up tubes.