Dresden 2026 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

FM: Fachverband Funktionsmaterialien

FM 11: Poster Session Functional Materials

FM 11.16: Poster

Dienstag, 10. März 2026, 18:00–20:30, P4

Correlated Imaging of Thermal Conductivity and Ferroelectric Domains in PbTiO₃ Using Scanning Probe Microscopy — •Ciara Ward, Lindsey Lynch, and Raymond McQuaid — Queen’s University Belfast, Belfast, UK

Perovskite ferroelectrics are an attractive platform for realising thermal conductivity switching through voltage configuration of domain microstructure. Reported mechanisms involve thermal conductivity modulation through structural re-orientation (anisotropy) [1,2] or phonon scattering by domain wall defects [3-5], both of which can be controlled through sample geometry and applied fields. Heat flow measurements and thermoreflectance investigations have quantitatively benchmarked thermal switching ratios but, in some cases, a lack of direct thermal mapping introduces ambiguity as to the relative role played by the two mechanisms. We are using Scanning Thermal Microscopy to explicitly map the local thermal conductance in samples of archetypal ferroelectric PbTiO₃ to clarify the underlying mechanisms that enable modulation of thermal transport. In tandem, we are using domain engineering and electric-field poling techniques to demonstrate the maximum achievable contrast in thermal conductance in this system.

[1] J. Seijas-Bellido et al. Appl. Phys. Lett. 115, 192903 (2019). [2] L. Féger et al. Phys. Rev. Mater. 8, 094403 (2024). [3] Ihlefeld et al. Nano Lett. 15, 1791 (2015). [4] E. Langenberg et al. Nano Lett. 19, 7901 (2019). [5] R. Belrhiti-Nejjar et al. Adv. Sci. 12, e06931(2025).

Keywords: Scanning Thermal Microscopy; Piezoresponse Force Microscopy; Domain Engineering; Thermal Conductivity; Ferroelectrics