Berlin 2015 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 4: Focused Session on Ferroic Domain Walls I (DF with MA)

DF 4.8: Topical Talk

Montag, 16. März 2015, 18:00–18:30, EB 107

Functional ferroic domain walls - AC & DC transport — •Lukas M. Eng — Institute of Applied Physics, TU Dresden, 01062 Dresden, Germany

Wide band-gap ferroic oxides exhibit both ferroelectric and ferromagnetic properties that promise a novelty of tunable and spectacular applications such as magneto-electric storage devices [1] or meta-material-based superlensing [2]. We focus here on the domain wall functionality which is clue in order to engineer devices as the ones mentioned above for modern-type applications. Surprisingly, we find such domain walls in LiNbO₃ and other single crystals to exhibit a metallic-like conductivity [3] that can even be tuned or switched on and off. Consequently, such charged domain walls allow for both AC [4] and DC [3] electron transport within a nanometer-wide discontinuity that is embedded in a fully insulating matrix. We investigated these novel topologies with a variety of scanning probe techniques, through transport measurements as well as with nonlinear optical methods [5], Since these metallic-like nanocontacts can be engineered on will, they provide a novel and elegant way for exploring nanoscale 2-dimensional transport properties.
R. Streubel et al., Phys. Rev. B 87, 054410 (2013). [2] S.C. Kehr et al., Nature Comm. 2, 249 (2011). [3] M. Schröder et al., Adv. Funct. Mater. 22, 3936 (2012). [4] M. Schröder et al., Mater. Res. Express 1, 035012 (2014). [5] T. Kämpfe et al., Phys. Rev. B 89, 035314 (2014).