Current interests

Dr Michael Hall is currently Principal Research Scientist in the Functional Materials Group at NPL. His technical expertise covers magnetic material measurements for operational conditions, magnetic field generation and measurement including magnetic fields down to less than 1nT for advanced sensors and reference materials for magnetic signature determination and electrical conductivity for NDT. Michael is also the elected UK expert on magnetic measurements for IEC TC68 and a member of BSI technical committee ISE/108.

Michael is a Member of the Institute of Physics and a Chartered Physicist.

Biography

Michael received his BSc degree in Physics and PhD in the GMR of Co/Cu superlattices deposited by molecular beam epitaxy from the University of Leeds. He continued this research on sputtered multilayers at the University of Cambridge from 1994 to 1997.

Michael joined NPL in 1997 and is responsible for magnetic material and AC conductivity measurements and development work. A recent project developed an open circuit approach to measure the AC properties of soft magnetic materials at operational conditions of stress, temperature and electrical waveforms. This measurement technique is used by electrical machine developers to select materials for advanced applications such as electrical generators embedded in gas turbines. He is convenor of IEC TC 68 WG2 for meetings held outside the UK, technical reviewer for CPEM and a recent member of the management committee of the UK Magnetics Society.

Michael has published more than 25 papers and managed the development of two International Standards and a Technical Report.

Selected publications

• Influence of local pole piece saturation on the measurement of the intrinsic coercivity of permanent magnets using a closed magnetic circuit
  Michael Hall and Harshad Patel
  Journal of Magnetism and Magnetic Materials, submitted 2011.
• Equivalence of Measurements on Soft Magnetic Materials in the UK and Measurements for Operational Conditions
  Michael Hall, Owen Thomas, Harvey Smith and Philip Anderson
  IEEE Transactions on Instrumentation & Measurement, 60 (7), pages 2275-2279 (2010)
• Comparison of AC and DC conductivity standards
  Stuart Harmon, Lesley Henderson and Michael Hall
  Metrologia, 46 01009 (2009)
• Precision and Accuracy Study on Measurement of Soft Magnetic Properties Using DC Hysteresigraphs
  R. M. Strnat, M. J. Hall and M. S. Masteller
  IEEE Transactions on Magnetics, 43 (5), pages 1884 – 1887 (2007)
• Traceable measurement of magnetic properties for non-sinusoidal conditions
  Michael Hall
  Przeglad Elektrotechniczny, R. 81 NR 5/2005, pages 58-63
• Calibration of commercial conductivity meters for measuring small items
  S.A.C. Harmon, M.J. Hall, L.C.A. Henderson, P.P. Munday
  IEE Proc-Sci. Meas. Technol., 151 (5) (2004)

Contact details

E-mail: michael.hall@npl.co.uk
Tel: +44 20 8943 7189