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Physics Microscopy

Wanbing Ge

Background

2012-2019, BSc Electronic Science & MSc Materials Science, University of Electronic Science and Technology of China

Thesis: Dynamic Scaling Behaviour of Ferroelectric Domain Walls

2019-2023, PhD Physics, supervised by Prof. Ana SanchezLink opens in a new window, University of Warwick

EPSRC project: In-situ manipulation of ferroelectric structures at atomic level

Research Interests

My research focuses on the study of functional oxides by various electron microscopy methods with the aim of understanding the relationship between structure, ferroelectricity and electronic properties. With the help of atomic resolution Scanning Transmission Electron Microscopy (STEM), we can locate atom positions of ferroelectric materials to analyse its structural properties like lattice spacing, strain distribution and atomic displacements to quantify its spontaneous polarization. Besides, we have a special interest on the structural and chemical analysis of novel interfaces, for example charged domain walls, and we are trying to carry out in-situ polarization analysis under electrical bias and/or heating to see how those structures would behave under various electrical/temperature conditions.

Examples

STEM-ABF images of BiFeO3 single crystal sample with beam direction parallel to [1-10]pc(left) and [110]pc(right), showing 180 degree domain wall in the middle. Arrows indicate the shift of Fe atoms relative to the centre of Bi atoms.

STEM-ADF image of epitaxial BiFeO3 thin film(top half, bright) grown on vicinal SrTiO3 substrate(bottom half, dark), with beam direction parallel to [100]pc. A dislocation line can be found in the middle of the interface, resulting the distortion of its surrounding unit cells.

Publications

Ge, W., Beanland, R., Alexe, M. and Sanchez, A.M. (2023), 3D Reconstruction of Sawtooth 180° Tail-to-Tail Domain Walls in Single Crystal BiFeO3. Adv. Funct. Mater. 2301171. https://doi.org/10.1002/adfm.202301171

Ge, W., Beanland, R., Alexe, M., Ramasse, Q. and Sanchez, A.M. (2023), 180° head-to-head flat domain walls in single crystal BiFeO3. Microstructures 2023;3:2023026. http://dx.doi.org/10.20517/microstructures.2023.13

Conferences & Workshops

  • EMAG-2021 (virtual, oral presentation) - "Polarization Mapping in Ferroelectrics by Atomic Resolution STEM".
  • QEM-2022 Workshop (Port-Barcarès, poster session)
  • ISAF-PFM-ECAPD 2022 (Tours, oral presentation) - "Nanodomain Structure and Charged Domain Walls in Single Crystal BiFeO3"
  • ELMINA-2022 (Belgrade, poster prize winner) - "Domain Structure and 180-degree Domain Walls in Single Crystal BiFeO3"

Teaching

  • 2019-2020: Demonstrator for the 2nd year Physics undergraduate laboratory.

Wanbing GE

葛宛兵

Department of Physics

University of Warwick

CV4 7AL

Email: Wanbing.Ge@warwick.ac.uk

Office: MAS 1.06