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Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 25: Ferroics - Domains, Domain Walls and Skyrmions I

MA 25.8: Talk

Tuesday, March 21, 2017, 11:45–12:00, WIL B321

Anisotropic domain wall conductivity (DWC) of neighboring 180 DWs in LiNbO3 single crystals — •Shuyu Xiao1,2, Thomas Kaempfe2, Yaming Jin1, Alexander Haussman2, Xiaomei Lu1, and Lukas Eng21Physics School, Nanjing University, 210093 Nanjing, P. R. China — 2Institute of Applied Physics, Technical University of Dresden, George-Baehr-Strasse 1, Dresden, Germany

Investigating the origin and nature of the domain wall conductivity (DWC) in different ferroelectric materials such as BiFeO3 [1], ErMnO3 [2] and LiNbO3 (LNO) [3] is of a major scientific interest today. Here, we report on anisotropic DWC, as found between neighboring head-to-head (h2h) and tail-to-tail (t2t) 180 DWs in z-cut LNO single crystals. We applied conductive atomic force microscopy (cAFM) to quantify the local DW currents, probed the local polarization by piezo-response force microscopy (PFM), and mapped the 3D domain topology via Cherenkov Second Harmonic Generation (CSHG) microscopy [4]. The origin of the different DWC between h2h and t2t is studied by both phenomenological theories and dipole modelling assuming a quantum-mechanical tunneling process for electron transport. The domain wall inclination is found to account for the different conductivities in neighboring 180 DWs, while the material symmetry determines whether h2h or t2t DW becomes more conductive. In addition, domain wall roughness plays an important role in DWC as well.

[1] J. Seidel et al., Nat. Mater., 8 (2009), 229 [2] D. Meier et al., Nat, Mater., 11 (2012), 284 [3] M. Schroeder et al., Mater. Res. Express., 1 (2014), 035012 [4] T. Kaempfe et al., Phys. Rev. B, 89 (2014), 035314

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