Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

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

MA 25.13: Vortrag

Dienstag, 21. März 2017, 13:15–13:30, WIL B321

Reconfigurable domain wall conductance by inclination tuning — •Thomas Kämpfe¹, Bo Wang², Scott Johnston³, Eric Y. Ma³, Alexander Haußmann¹, Hui Hu⁴, Zhi-Xun Shen³, Long-Qing Chen², and Lukas M. Eng¹ — ¹Institute of Applied Physics and Center for Advancing Electronics (CFAED), TU Dresden, Germany — ²Department of Materials Science and Engineering, Pennsylvania State University, University Park, USA — ³Department of Applied Physics and Geballe Laboratory for Advanced Materials (GLAM), Stanford University, USA — ⁴School of Physics, Shandong University, Jinan, China

We report on ferroelectric domain wall (DW) conductance in lithium niobate thin films that allows reproducibly writing/erasing DWs by proper voltage adjustment. The DWs are conductive and show persistent DWC at least for two months. Mandatory to DW conductance is a minimal DW inclination that promotes electron transport without illumination [1]. We proof this dependence indirectly: we compare cAFM measurements for domains written at various writing voltages and compare it with the simulated inclination angles obtained from phase-field modeling, which shows a decrease in inclination the larger the writing voltage. The conductance was further investigated by scanning-microwave impedance microscopy (sMIM) revealing a conductivity of about 100 to 1000 S/m at 1 GHz, hence an increase of about 10¹¹ to the bulk conductivity of about 10⁻⁸ S/m.
[1] M.Schröder et.al., Adv. Funct. Mater. 22, (18), 3936 (2012)