Spectroscopic investigation of lattice dynamics in multidomain ferroelectrics

0384077 - FZÚ 2013 CZ eng D - Thesis
Vakkechalil John, Elizabeth
Spectroscopic investigation of lattice dynamics in multidomain ferroelectrics.
Fyzikální ústav AV ČR, v. v. i. - Praha: Matematicko-fyzikální fakulta UK, 2012. 130 s.
R&D Projects: GA ČR GAP204/10/0616; GA MŠMT ME08109
Institutional research plan: CEZ:AV0Z10100520
Keywords : ferroelectric domains * infrared spectroscopy * Raman spectroscopy , , and * PFM imaging * PbTiO₃ thin films * PbTiO₃ ceramics * PZT
Subject RIV: BM - Solid Matter Physics ; Magnetism

Here we studied signature of domain structure in PbTiO3 thin film grown by metalorganic chemical vapor deposition technique on different substrates, namely LaAlO3, MgO, NdGaO3, SrTiO3(100), SrTiO3(110), SrTiO3(111) doped with 0.5% Nb and LSAT. Certain aspects of domain structure can be conveniently revealed by using infrared reflectance an Raman spectroscopic techniques. Differences in domain pattern are associated with different aspects related to the thin film like the film thickness, lattice mismatch between substrate and thin film, etc. A local insight into the complex nanodomain architecture can be seen using piezoresponse force microscopy imaging techniques. A detailed study of 250 nm and 110 nm thick PTO/LAO thin film has shown different patterns of ferroelectric domain structure with all six tetragonal ferroelectric domain states and both 180 degree and 90 degree ferroelectric walls.
Permanent Link: http://hdl.handle.net/11104/0213827