Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 11: Ferroelectric Domain Walls I (joint session KFM/TT)

TT 11.8: Vortrag

Montag, 12. März 2018, 12:00–12:15, EMH 225

In-situ 4D observation of ferroelectric domain wall dynamics using second-harmonic generation microscopy — •Lukas Wehmeier, Alexander Haußmann, and Lukas M. Eng — Institute of Applied Physics, Technische Universität Dresden, 01062 Dresden, Germany

Second-harmonic generation microscopy (SHGM) allows for the three-dimensional (3D) observation of ferroelectric domain walls (DWs) across millimeter-thick bulk materials [1,2]. For example, this is of supreme value for exploring inclined and charged domain walls [1,3]. Here, we apply SHGM in order to quantify the DW dynamics in triglycine sulfate (TGS) single crystals upon the ferroelectric-to-paraelectric phase transition at the Curie temperature of ≈ 49 ^∘C [4]. In addition, we study DW dynamics that are induced by external electric fields.

We show for TGS that SHGM allows exploring such electric-field-induced and temperature-driven DW dynamics in 4D, i.e. in real-time and full 3D imaging.

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

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

[3] C. Godau et al., ACS Nano 11, 4816 (2017).

[4] L. Wehmeier et al., Phys. Stat. Solidi RRL 11, 1700267 (2017).