Dresden 2006 – wissenschaftliches Programm
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DF: Dielektrische Festkörper
DF 3: Poster Session
DF 3.9: Poster
Montag, 27. März 2006, 09:30–17:00, P1
Optimization of sol-gel preparation and physical properties of multiferroic BiFeO3 thin films — •Salah Habouti, Claus-Henning Solterbeck, Shiva Kumar Rudra, and Mohammed Es-Souni — Institute for Materials and Surface Technology, University of Applied Sciences, Kiel, Germany
Compared to other deposition techniques, chemical solution deposited BiFeO3 thin films show lower polarization values. To overcome this problem and optimize the films, influences of various parameters were investigated, like precursor solutions, annealing, temperatures and times, atmosphere etc. Their influence on crystallization, grain growth and microstructure were determined by x-ray diffractometry (θ−2θ, grazing incidence), electron microscopy, and atomic force microscopy. The effects on the physical properties were investigated by macroscopical measurements of polarization, hysteresis, leakage current, impedance, and piezoelectric activity. Microstructural effects on local electrical properties were studied by means of electrical force microscopy. As a first success the dielectric strength was increased by a factor of 8.
Magnetic properties were measured by a vibrating sample magnetometer and by a scanning magneto-optical Kerr-effect device.