Associate Professor Malcolm John Grimson
BSc (E.Anglia), PhD (Kent), FInstP, Cphys
Research | Current
Condensed Matter Physics
- Soft condensed matter
- Surfaces and interfaces
- Ferroics and multiferroics
- Phase transitions
- Monte Carlo simulation methods
- Complex systems
Thin magnetic films
Hystersis and the dynamic phase transition in thin ferromagnetic films are being investigated with continuous spin models of magnetism in collaboration with Hyunbum Jang. The existence of such a non-equilibrium phase transition, first observed in discrete Ising models of magnetism, has been shown to be present in continuous spin models with an anisotropy in the bilinear exchange interaction between spins. The nature of the dynamic phase transition in the presence of competing applied surface fields differs markedly from that found in bulk systems. This is a consequence of interface localization in the thin film arising from the competing surface fields that act to pin the ferromagnetically ordered regions of opposite magnetization to the film surfaces.
Areas of expertise
Condensed Matter Physics
Selected publications and creative works (Research Outputs)
- Wang, Z., Ma, Z., & Grimson, M. J. (2018). Magnetoelectric coupling and the manipulation of magnetic Bloch skyrmions. APPLIED PHYSICS LETTERS, 113 (10)10.1063/1.5049832
- Willmott, G., Hammerschmidt, L., Grimson, M., Riddings, K., Hendy, S., Wills, P., ... Demarais, N. (2017). "Physics at the Interface" in Auckland. AAPPS Bulletin, 27 (5), 8-14.
Other University of Auckland co-authors: Geoff Willmott, Shaun Hendy, Frederique Vanholsbeeck, Nicholas Demarais, Peter Wills
- Wang, Z., & Grimson, M. J. (2016). Ferroelectrics manipulate magnetic Bloch Skyrmions in a composite bilayer. arXiv New York, USA: Cornell University Library.
- Wang, Z., & Grimson, M. J. (2016). Driving skyrmions in a composite bilayer. Physical Review B, 94 (1), 1-6. 10.1103/PhysRevB.94.014311
- Grimson, M., & Wang, Z. (2016). Dynamic response in a finite size composite multiferroic thin film. Journal of Applied Physics, 119 (12).10.1063/1.4944604
- Wang, Z., & Grimson, M. J. (2016). Magnetic chiral skyrmions and electric "footprint skyrmions" in composite multiferroics. Paper presented at EMN (Energy, Materials, Nanotechnology) Croatia Meeting 2016, Dubrovnik, Croatia. 3 May - 7 May 2016.
- Wang, Z., & Grimson, M. (2016). Stochastic dynamics and dynamic response in a composite multiferroic thin film. Paper presented at 13th Joint MMM-Intermag Conference, San Diego, USA. 11 January - 15 January 2016.
- Wang, Z., & Grimson, M. J. (2015). Pseuedo-spin based dynamical model for polarisation switching in ferroelectrics. arXiv New York, USA: Cornell University Library.