Dresden 2017 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 17: Ferroics - Domains, Domain Walls and Skyrmions IV

DF 17.10: Vortrag

Donnerstag, 23. März 2017, 12:45–13:00, WIL B321

In-situ 3D observation of the domain wall dynamics of triglycine sulfate upon ferroelectric phase transition — •Lukas Wehmeier, Thomas Kämpfe, Alexander Haußmann, and Lukas M. Eng — Institute of Applied Physics, Technische Universität Dresden, Dresden, Germany

Second harmonic generation microscopy (SHGM), also known as Cherenkov-SHG, allows for the 3-dimensional (3D) observation of ferroelectric domain walls (DWs) across millimeter-thick bulk materials [1,2]. We apply here SHGM in order to quantify the DW dynamics in triglycine sulfate (TGS) single crystals upon the ferroelectric-to-paraelectric phase transition around Tc = 49°C. Although having been in the focus of many works, this second-order phase transition is still of fundamental interest, especially in the view of our novel 3D techniques at hand or with respect to explore charged domain walls [3-5] in bulk single crystals. SHGM allows, for the first time, to watch the time-resolved dynamics in real time and in 3D, here when crossing the Curie temperature Tc. Furthermore, we also monitor the spike domain growth in TGS using SHGM. Spike domains are an excellent example of transient charged domain walls that topologically differ completely from the equilibrium bulk domain structure.

[1] T. Kämpfe et al., Phys. Rev. B 89, 035314 (2014)

[2] T. Kämpfe et al., Appl. Phys. Lett. 107, 152905 (2015)

[3] M. Schröder et al., Mater. Res. Express 1, 035012 (2014)

[4] M. Schröder et al., Adv. Funct. Mater. 22, 3963 (2012)

[5] T. Sluka et al., Nat. Commun. 3, 748 (2012)