Dresden 2020 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 9: Focus: Polar oxide crystals and solid solutions

KFM 9.10: Talk

Wednesday, March 18, 2020, 12:50–13:10, TOE 317

Tunable conductive domain wall switches in 200-µm-thick lithium niobate single crystals — •Henrik Beccard, Benjamin Kirbus, Ekta Singh, Zeeshan Amber, Michael Rüsing, Elke Beyreuther, and Lukas M. Eng — Institut für Angewandte Physik, Technische Universität Dresden, Nöthnitzer Str. 61, 01187 Dresden, Germany

In the ferroelectric model material lithium niobate (LNO), state-of-the-art techniques allow the targeted poling of ferroelectric domains, as well as the robust enhancement of domain wall (DW) conductivity over several orders of magnitude [1]. Imaging and analyzing these properties can be elegantly performed with piezoresponse force microscopy (PFM) and confocal 3D second harmonic generation (SHG) microscopy [2]. The correlation between DW geometry and electrical DW conductivity is well established both theoretically and experimentally. Moreover, it can be adequately simulated e.g. using a resistor network model [3].

Therefore, an increasing focus in the ferroelectrics community is set on the realization of DW-based nanoelectronic devices. Recently, tunable DW switches have been reported for LNO thin films [4]. On the contrary, we report on tunable DW switches inside of 200-µm-thick LNO single crystals, relying purely on solid electrodes [5].

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

[2] T. Kämpfe et al. Phys. Rev. B 8, 035314 (2014)

[3] B. Wolba et al. Adv. Electron. Mater. 4, 1700242 (2018)

[4] H. Lu et al. Adv. Mater. 1902890 (2019)

[5] B. Kirbus et al. ACS Appl. Nano Mater. 2, 5787 (2019)