Dresden 2014 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MI: Fachverband Mikrosonden
MI 2: Untersuchung von kondensierter Materie mittels Positronen-Annihilation
MI 2.6: Talk
Monday, March 31, 2014, 12:00–12:15, MER 02
Apparatus for In-situ Defect Analysis (AIDA) — •Maciej Oskar Liedke1, Wolfgang Anwand1, Kay Potzger2, Alireza Heidarian2, Rantej Bali2, and Andreas Wagner1 — 1Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiation Physics, Bautzner Landstraße 400, 01328 Dresden, Germany — 2Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstraße 400, 01328 Dresden, Germany
A unique high vacuum system combining material evaporation and ion beam modification with positron annihilation spectroscopy (PAS) has been developed and installed in the Helmholtz-Zentrum Dresden-Rossendorf. The in-situ system is capable to perform Doppler broadening spectroscopy as well as resistometry (4 point probe). It is an end station of the Slow-Positron System of Rossendorf (SPONSOR) that provides a mono-energetic positron beam pre-accelerated in the range of 80 eV to 35 keV thus enabling sample depth profiling. The main focus of studies is the in-situ modification (during growth, ion irradiation, cooling/annealing) and the analysis of open volume defects and the chemical environment in thin films of, e.g., memristive oxides or metal alloys. First results on the FeAl ion irradiation/annealing driven magnetic phase transition between the paramagnetic and ferromagnetic state as a function of the open volume defects will be shown. The project is financed by the Impuls- und Vernetzungsfonds of the Helmholtz Association (code VH-VI-442).