Background and activities

I am currently working with Prof Dennis Meier to investigating next-generation 2D materials for future nanotechnology. I am using state-of-the-art scanning probe microscopy techniques to explore the unusual electronic properties that arise at domain walls in ferroelectric and multiferroic materials. Such domain walls represent natural interfaces with fascinating physical properties, including magnetism, superconductivity and more. Most interestingly, these walls can be written, moved and erased on demand, which opens the pathway towards completely new device paradigms.

 

Previous:
Postdoc with Prof Michael Carpenter, Department of Earth Science, University of Cambridge. The project involved using Resonant Ultrasound Spectroscopy (RUS) for measuring elastic and anelastic properties of small single crystal and ceramic samples at low temperatures and in a high magnetic field. The scientific objectives was to investigate the role of elastic strain and microstructure dynamics in controlling the structural evolution, magnetic, dielectric, electrical and electronic properties of ferroic and multiferroic materials.

This lead to investigation of skyrmion system Cu2OSeO3 [1], double perovskite solar cells [2] [3], and ongoing research into the fascinating pnictide family of high temperature superconductors.

 

PhD with Prof Marty Gregg and Dr Alina Schilling, Physics department, Queen’s University Belfast.

Investigating the properties of the first single phase multiferroic material with room temperature magnetoelectric coupling [4] [5] [6]. With a focus on the nature of the magnetoelectric coupling [7] [8]. 

 

Masters Project with Prof. J. F. Scott, Physics department, University of Cambridge [9].

 

Full list of publications can be found on my google scholar page:
https://scholar.google.com/citations?hl=en&user=5R3gnggAAAAJ&view_op=list_works

 

 

[1] D. M. Evans, et al., “Defect dynamics and strain coupling to magnetization in the cubic helimagnet Cu2OSeO3”, Phys. Rev. B 95, 094426 (2017)

[2] F. Wei, et al., “Synthesis and Properties of a Lead-Free Hybrid Double Perovskite: (CH3NH3)2AgBiBr6”. Chem. Mater., 29 (3), (2017)

[3] F. Wei, et al., “The synthesis, structure and electronic properties of a lead-free hybrid inorganic–organic double perovskite (MA)2KBiCl6 (MA = methylammonium)”. Mater. Horiz., 3, 328-332 (2016)

[4] D. M. Evans, et al., “Magnetic switching of ferroelectric domains at room temperature in multiferroic PZTFT”. Nat. comms. 1534 (2013)

[5] J. Schiemer, et al., “Studies of the RoomTemperature Multiferroic Pb (Fe0. 5Ta0. 5) 0.4 (Zr0. 53Ti0. 47) 0.6 O3: Resonant Ultrasound Spectroscopy, Dielectric, and Magnetic Phenomena”. Adv. Funct. Mater. 24, 2993–3002 (2014)

[6] US patent, Micro and nanoscale magnetoelectric multiferroic lead iron tantalate-lead zirconate titanate. US 9299485 B1

[7] D. M. Evans, et al., “The Nature of Magnetoelectric Coupling in Pb(Zr,Ti)O3–Pb(Fe,Ta)O3”. Adv. Mater. 27, 6068–6073 (2015)

[8] D. M. Evans, et al., “Switching ferroelectric domain configurations using both electric and magnetic fields in Pb (Zr, Ti) O3–Pb (Fe, Ta) O3 single-crystal lamellae”. Phil. Trans. R. Soc. A 372: 20120450 (2014)

[9] S. P. P. Jones, et al., “Phase diagram and phase transitions in ferroelectric tris-sarcosine calcium chloride and its brominated isomorphs”. Phys. Rev. B 83, 094102 (2011)