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Dr Jon Peters

Background

In 2013 I graduated from the University of Warwick with an MPhys. I chose to stay on to do my PhD under the supervision of Prof. Ana Sanchez which I completed in 2017 with the title "Structure and ferroelectricity at the atomic level in perovskite oxides." I am now a research fellow on the project "Ferrotoroidic structures: polar flux-closure, vortices and skyrmions" headed by Prof. Marin Alexe and Prof. Ana Sanchez.

Research Interests

My main work is with ferroelectric oxide thin films, particularly ABO3 perovskites such as PbZrxTi1-xO3 and BiFeO3. I use a combination of (HR)TEM, STEM and diffraction techniques (D-LACBED) in combination with computation to detect, measure and map polarisation domains. I am interested in any application of TEM in materials science and have helped published papers on other topics such as 2D materials and electrochemistry.

Software I have worked on includes:

  • A routine based off Pedro Galindo's Peak Pairs algorithm to measure the local displacement between different sublattices, used to measure polarisation
  • Two versions of Martin Hÿtch's Geometric Phase Analysis for measuring strains
    • Strain++ - an open source, stand alone C++ program.
    • A Digital Micrograph plugin using GPUs (OpenCL) to perform the computation on the microscope in real time
  • clAlign, a Digital Micrograph image alignment plugin using OpenCL that can perform a straight forward cross correlation or solve an overdetermined set of equations for the displacements
  • clTEM, an opensource OpenCL multislice simulation I have worked on with Adam Dyson
  • CIF2XYZ, a program to take a .cif structure and make an .xyz structure for use with simulation packages
  • DM Stack Builder, a digital micrograph plugin to record live data from any signal on a microscope
  • Various small digital micrograph scripts to automate or speed up tasks

Examples

STO LACBED

D-LACBED pattern from SrTiO3. Colour was added in post-processing.

LSMO ABF

ABF-STEM image of LSMO. The oxygen octahedral tilting can
be seen as the oxygen move upwards and downwards.

Multislice simulation of Si 111 CBED pattern for increasing thickness.

Publications

Conferences

  • MMC 2014 (Poster) - "Exploring the polarity in oxide thin films"
  • IMC 2014 (Oral) - "Exploring the polarity in oxide thin films"
  • MSM 2015 (Oral) - "Anomalous strain from geometric phase analysis of Z-contrast images at interfaces"
  • MMC 2015 (Oral) - "Structure and dynamics of Pb2ScTaO6 relaxor ferroelectrics studied using transmission electron microscopy"
  • MMC 2015 (Poster) - "Anomolous strain at interfaces in geometric phase analyses of Z-contrast images"
  • Domain walls as new 2D functional materials 2016 (Poster) - "Domain structure in ultrathin ferroelectric tunnel junctions"
  • EMAG 2016 (Oral) - "Revealing local polarisation and domain configurations in ultrathin ferroelectric tunnel junctions by annular bright field STEM"
  • International Workshop on Topological Structures in Ferroic Materials 2017 (Invited talk) - "Revealing polarisation curling and flux closures in ferroelectric tunnel junctions using atomic resolution transmission electron microscopy"
  • IMC19 (Poster) - "In situ transmission electron microscopy of domain switching in ferroelectric films"
  • ISFM14 (Oral) - "Polarisation and octahedral tilting at La0.7Sr0.3MnO3-PbTiO3 interfaces in ferroelectric tunnel junctions"

Jon Peters

ORCid Research Gate Google Scholar

Address:
Jonathan Peters,
Department of Physics,
University of Warwick,
Coventry,
CV4 7AL

Office:
MAS1.06

Tel:
+44 (0)24765 74395

Email: j dot peters dot 1 at warwick dot ac dot uk