Browsing by Author "Xiao, Shuyu"

Now showing 1 - 2 of 2

Conductive tail-to-tail domain walls in epitaxial BiFeO3 films
(2018-08-20)
Jin, Yaming
;
Xiao, Shuyu
;
Yang, Jan-Chi
;
Zhang, Junting
;
Lu, Xiaomei
The complex conductive behavior of ferroelectric domain walls is attracting more and more attention for their potential application as an independent nanoelectronic component. For the (001) epitaxial BiFeO3 films, we find that the domain wall conductivity varies among 71 degrees domain walls, with tail-to-tail (T-T) domain walls more conductive than head-to-head (H-H) and head-to-tail (H-T) ones. Furthermore, it is observed that most of the conductive areas are composed of two parallel lines around the T-T domain walls. These experimental results can be well simulated by our theoretical model based on the polarization configuration and a tunneling mechanism. Our work will help to understand the mechanism of domain wall conductance in ferroelectric materials and further promote the usage of domain walls in advanced nano-devices. Published by AIP Publishing.
Dry lubrication of friction on ferroelectric BiFeO3 film
(2018-11-01)
Yang, Chunbin
;
Xiao, Shuyu
;
Yang, Jan-Chi
;
Lu, Xiaomei
;
Chu, Ying-Hao
Epitaxial BiFeO3 film shows excellent ferroelectric properties, which is not only studied extensively in magnetoelectric modulation but also shows good tribological performance. In our experiment, we find that the surface of BiFeO3 film can be more lubricant with the application of bias voltages or stress through the AFM probe with a reduction (up to similar to 40%) of the friction between the sample and the probe tip. Based on the Prandtl-Tomlinson model, the mechanism of the dry lubrication on BiFeO3 film originates from the reduction of van der Waals force between sample surface and probe tip. The findings here could be advantageously used in promoting the performance and durability of Micro/Nano Electromechanical devices based on ferroelectric thin films.