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Detailed Program
Paper Number : TF-I01
Time Frame : 16:30~16:55
Presentation Date : Thurseday, 27, November
Session Name : Thermoelectrics
Session Chair 1# : Jaeyeong Heo
Session Chair 2# : Hiromitsu Kozuka
Domain Structure Change with Temperature in (100)/(001)- oriented Epitaxial PbTiO3 Films Grown on KTaO3 Films.
Hiroshi FUNAKUBO
Tokyo Institute of Technology
Domain structure of ferroelectric films is widely known to determining ferroelectric and electromechanical properties of these films. We recognize that strain from the substrate is as one of the determine factor of these domain structure[1]. Theoretical prediction has been carried out for PbTiO3[2]. This suggests for (100)/(001)-oriented PbTiO3 films with in-plane tensile strain that the ferroelectric domain structure change from perfect (001) orientation to the mixture one of (100) and (001) under the cooling process below Tc. However, this domain structure change with temperature has not been reported experimentally.
In the present study, we grew (100)/(001)-oriented epitaxial PbTiO3 films with in-plane tensile strain and demonstrate this domain structure change with temperature below Tc.
Fig.1 shows the XRD reciprocal space mappings (RSMs) around (100) KTaO3 202 measured at (a) 30 ¢ªC, (b) 500 ¢ªC, (c) 600 ¢ªC for 130 nm thick PbTiO3 film grown on (100)KTaO3 substrate. Films showed phase transition between 600 and 500oC because clear (100)-oriented in-plane domain structure was observed at 500oC. Noticeable thing is that this films include (100) orientation at 30oC. This clearly shows that domain structure change between 500 and 30 oC. This domain structure change was in good agreement with the theoretical prediction by Koukhar et al.


Fig.1 XRD reciprocal space mappings (RSMs) around (100) KTaO3 202 measured at (a) 30 ¢ªC, (b) 500 ¢ªC, (c) 600 ¢ªC for 130 nm thick PbTiO3 film grown on KTaO3 substrate

References:
[1] A. K. Tagantsev et al.,(2009) Domains in ferroic crystals and thin films, Sprigner, New York.
[2] V. G. Koukhar. et al., Phys. Rev. B 64, 214103(2001)

Acknowledgements : This research was partially supported by JSPS Kakenhi (No. 26220907)