Allwood, Dan A - University of Sheffield - Department of Materials Science and Engineering

个人简介

Dan Allwood was awarded an EPSRC Advanced Research Fellowship in 2004 and in 2005 joined the Sheffield Centre for Advanced Magnetic Materials and Devices in the Department of Materials Science and Engineering. His BSc (1994) and PhD (1998) in Applied Physics were awarded from the University of Hull. He also worked as a post-doctoral research assistant in: University of Oxford, Department of Physics, 1997-1999 Imperial College London, Department of Chemistry, 1999-2001 Durham University, Department of Physics, 2001-2005

研究领域

Dan Allwood's research focuses on the understanding, analysis and application of magnetisation processes in magnetic thin films and nanostructures. A particular area of expertise is in domain wall processes in patterned magnetic nanowires. The extended geometry of these wires creates a simplified magnetic environment in which domain walls can be positioned. These nanowire systems have applications in information technology (memory and data processing) and in controlling secondary systems (e.g. magnetic beads or ultra-cold atoms). Prof Allwood has developed 2-D magnetic nanowire networks for controlling magnetic domain wall propagation and creating new ways of performing memory and logic operations. More recently, he has introduced a hybrid multi-ferroic system for controlling domain wall position using applied stress that is suitable for synchronous memories. Dr Allwood has developed a high sensitivity magneto-optical Kerr effect (MOKE) instrument for analysing individual nanostructures and optical methods for improving the MOKE response. Dr Allwood’s work on using domain walls in nanowires as nanoscale sources of magnetic field has resulted in demonstrations of interactions with other domain walls, magnetically labelled biological cells and sub-milliKelvin paramagnetic atoms. The magnetic films works on are deposited on atomically-flat substrates using thermal evaporation or sputter deposition. Nanostructures are patterned either by electron-beam lithography or focussed ion beam milling. Topographic imaging of the structures usually requires either atomic force or scanning electron microscopies. Dr Allwood´s experimental research often uses the MOKE technique to analyse the magnetic response of nanostructures and films, magnetically-resolving soft X-ray microscopy (with Dr Peter Fischer of the Centre for X-ray Optics) and micromagnetic finite element modelling.

近期论文

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M. T. Bryan, K. H. Smith, M. E. Real, P. W. Fry, P. Fischer, M.-Y. Im, T. Schrefl, D. A. Allwood and J. W. Haycock, ‘Switchable cell trapping using superparamagnetic beads’, IEEE Magn. Lett. 1 (2010) 1500104. T. J. Hayward, M. T. Bryan, P. W. Fry, P. M. Fundi, M. R. J. Gibbs, D. A. Allwood, M.-Y. Im and P. Fischer, ‘Direct imaging of domain-wall interactions in Ni80Fe20 planar nanowires’, Phys. Rev. B 81 (2010) 020410(R). J. Dean, M. T. Bryan, T. Schrefl and D. A. Allwood, ‘Stress-based control of magnetic nanowire domain walls in artificial multiferroic systems’, J. Appl. Phys. 109 (2011) 023915. M. Negoita, T. J. Hayward and D. A. Allwood, ‘Controlling domain walls velocities in ferromagnetic ring-shaped nanowires’, Appl. Phys. Lett. 100 (2012) 072405. G. Hrkac, J. Dean and D. Allwood, ‘Nanowire spintronics for storage class memories and logic’, Phil. Trans. R. Soc. A 369 (2011) 3214. A. D. West, K. J. Weatherill, T. J. Hayward, P. W. Fry, T. Schrefl, M. R. J. Gibbs, C. S. Adams, D. A. Allwood and I. G. Hughes, ‘Realization of the Manipulation of Ultracold Atoms with a Reconfigurable Nanomagnetic System of Domain Walls’, Nanoletters 12 (2012) 4065. M. T. Bryan, T. Schrefl, D. Atkinson, and D. A. Allwood, ‘Magnetic domain wall propagation in nanowires under transverse magnetic fields’, J. Appl. Phys. 103 (2008) 073906. L. Lin, Y. Xu, S. Zhang, I. M. Ross, A. C. M. Ong and D. A. Allwood, ‘Fabrication of luminescent monolayered tungsten dichalcogenides quantum dots with giant spin-valley coupling’, ACS Nano 7 (2013) 8214. H. AlQahtani, M. T. Bryan, T. J. Hayward, M. P. Hodges, M.-Y. Im, P. Fischer, M. Grell and D. A. Allwood, ‘Planar organic spin valves using nanostructured Ni80Fe20 magnetic contacts’, Org. Electron. 15 (2014) 276. L. Lin, Y. Xu, S. Zhang, I. M. Ross, A. C. M. Ong and Dan A. Allwood, ‘Fabrication and Luminescence of Monolayered Boron Nitride Quantum Dots’, Small 10 (2014) 60.