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Personal profile

Research Interests

Marty Gregg leads the nanoscale ferroelectric activity in Queen's University Belfast. He has had research activities on ferroelectric thin films and superlattices grown by Pulsed Laser Deposition (PLD) in the past, but more recently his research has involved the characterisation and understanding of well-controlled nanoscale ferroelectric entities cut from high purity bulk crystals using Focused Ion Beam milling. He has been directing particular attention to understanding and controlling domain and domain wall properties. This is rapidly becoming an area of great excitement, as it is becoming clear that ferroelectric domain walls are functional materials in their own right, with properties different from the domains that they surround.

Microscopy is a critical component in nanoscale ferroelectric research and Marty has been heavily involved in electron, ion and scanning probe techniques for most of his career. He has rejuvenated the transmission electron microscopy (TEM) and focused ion beam (FIB) microscopy capability of the university twice: first in 2000 through £1.5M of EPSRC funding for a Tecnai F20 TEM and FEI FIB and again in 2017 through £1.8M of EPSRC funding for a FEI Talos TEM and two Tescan FIBs. He is Director of the Electron Microscopy Facility.

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  • 7 Similar Profiles
Ferroelectric materials Chemical Compounds
Domain walls Chemical Compounds
capacitors Physics & Astronomy
thin films Physics & Astronomy
Single crystals Chemical Compounds
domain wall Physics & Astronomy
single crystals Physics & Astronomy
lamella Physics & Astronomy

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Projects 2004 2019

Research Output 2001 2019

An Electronically-Driven Improper Ferroelectric: Tungsten Bronzes as Microstructural Analogues for the Hexagonal Manganites

McNulty, J., Tran, T., Halasyamani, S., McCartan, S., MacLaren, I., Gibbs, A., Lim, F., Turner, P., Gregg, J., Lightfoot, P. & Morrison, F., 07 Aug 2019, In : Advanced Materials.

Research output: Contribution to journalArticle

Manganites
Tungsten
Bronze
Ferroelectric materials
Domain walls
1 Citation (Scopus)

Electrical Tunability of Domain Wall Conductivity in LiNbO3 Thin Films

Lu, H., Tan, Y., McConville, J., Ahmadi, Z., Wang, B., Conroy, M., Moore, K., Bangert, U., Shield, J., Chen, L-Q., Gregg, J. & Gruverman, A., 07 Oct 2019, In : Advanced Materials. 1902890.

Research output: Contribution to journalArticle

Domain walls
Thin films
Ferroelectric materials
Nanoelectronics
Thick films

Lighting up the new order

Gregg, J. M., 18 Mar 2019, In : Nature Materials. 18, p. 304-306 3 p.

Research output: Contribution to journalArticle

Open Access
File
Coulomb interactions
Ultraviolet radiation
illuminating
Lighting
electrostatics

Studies of Multiferroic Palladium Perovskites

Pradhan, D. K., Mishra, A. K., Kumari, S., Basu, A., Somayazulu, M., Gradauskaite, E., Smith, R. M., Gardner, J., Turner, P. W., N’Diaye, A. T., Holcomb, M. B., Katiyar, R. S., Zhou, P., Srinivasan, G., Gregg, J. M. & Scott, J. F., 08 Feb 2019, (Accepted) In : Scientific Reports. 9, 12 p., 1685.

Research output: Contribution to journalArticle

Open Access
File
Palladium
Atomic Force Microscopy
X-Rays
Pressure
Phase Transition

Correction: Giant resistive switching in mixed phase BiFeO3 via phase population control

Edwards, D., Browne, N., Holsgrove, K. M., Naden, A. B., Sayedaghaee, S. O., Xu, B., Prosandeev, S., Wang, D., Mazumdar, D., Duchamp, M., Gupta, A., Kalinin, S. V., Arredondo, M., McQuaid, R. G. P., Bellaiche, L., Gregg, J. M. & Kumar, A., 07 Nov 2018, In : Nanoscale. 10, 41, 1 p.

Research output: Contribution to journalComment/debate

Open Access

Prizes

Elected Member of the Royal Irish Academy

John Gregg (Recipient), 16 Mar 2018

Prize: Election to learned society

Fellow of the Institute of Physics

John Gregg (Recipient), 2007

Prize: Fellowship awarded competitively

Japan
community

Royal Irish Academy

John Gregg (Recipient), 16 Mar 2018

Prize: Election to learned society

Activities 1996 2019

Departmental Seminar at London Centre for Nanotechnology (UCL)

Marty Gregg (Invited speaker)
15 Jan 2019

Activity: Talk or presentation typesInvited talk

Invited Talk at IoP Dielectrics 2019

Marty Gregg (Invited speaker)
12 Apr 2019

Activity: Talk or presentation typesInvited talk

Invited Talk at EMA2019

Marty Gregg (Invited speaker)
25 Jan 2019

Activity: Talk or presentation typesInvited talk

Invited Talk at EMRS 2019

Marty Gregg (Invited speaker)
30 May 2019

Activity: Talk or presentation typesInvited talk

Invited Talk at EMRS2018

Marty Gregg (Invited speaker)
17 Sep 2018

Activity: Talk or presentation typesInvited talk

Press / Media

Behind the Science

John Gregg

20/02/2017

1 media contribution

Press/Media: Public Engagement Activities

Impact

Failure in Multilayer Ceramic Capacitors (MLCCs) for AVX Ltd

Robert Bowman (Participant), Marty Gregg (Participant), Mohamed Saad (Participant), Li-Wu Chang (Participant), Mark McMillen (Participant), Alina Schilling (Participant)

Impact: Economic Impact

Seagate Technology R&D Investment Strategy

Alina Schilling (Participant), Robert Bowman (Participant), Marty Gregg (Participant), Paul Evans (Participant), Xinhua Zhu (Participant), John McPhillips (Participant), Robert Pollard (Participant), Ronald Atkinson (Participant), William Hendren (Participant), Gregory Wurtz (Participant), Wayne Dickson (Participant), Anatoly Zayats (Participant)

Impact: Economic Impact

Thesis

Domain Patterns and Domain Wall Dynamics in Small-Scale Ferroelectrics

Author: McQuaid, R. G., Dec 2012

Supervisor: Gregg, J. (Supervisor)

Student thesis: Doctoral ThesisDoctor of Philosophy

File

Hall Potential Mapping of Conducting Ferroelectric Domain Walls

Author: Campbell, M., Sep 2017

Supervisor: Gregg, J. (Supervisor) & Kumar, A. (Supervisor)

Student thesis: Doctoral ThesisDoctor of Philosophy

File

Microstructural Dynamics Induced by Nanoscale Stress in Ferroelectrics

Author: Edwards, D., May 2018

Supervisor: Gregg, J. (Supervisor) & Kumar, A. (Supervisor)

Student thesis: Doctoral ThesisDoctor of Philosophy

Nanoscale Stress-Induced Conducting States in Functional Oxides

Author: Browne, N., Jul 2018

Supervisor: Kumar, A. (Supervisor) & Gregg, J. (Supervisor)

Student thesis: Doctoral ThesisDoctor of Philosophy

Transmission Electron Microscopy Study of Domains in Ferroelectrics

Author: Holsgrove, K., 2017

Supervisor: Arredondo-Arechavala, M. (Supervisor) & Gregg, J. (Supervisor)

Student thesis: Doctoral ThesisDoctor of Philosophy

File