Spectroscopic investigation of lattice dynamics in multidomain ferroelectrics

0384077 - FZÚ 2013 CZ eng D - Dizertace
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.
Grant CEP: GA ČR GAP204/10/0616; GA MŠMT ME08109
Výzkumný záměr: CEZ:AV0Z10100520
Klíčová slova: ferroelectric domains * infrared spectroscopy * Raman spectroscopy , , and * PFM imaging * PbTiO₃ thin films * PbTiO₃ ceramics * PZT
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus

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.
Trvalý link: http://hdl.handle.net/11104/0213827