Oxford Neutron School 2017

Ross
Stewart
 
 
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  • ​​​​Maps​​​ ​​​​​​​​​​​​​​​​​​​​​​Instrument Scientist

  • Polarized Neutron Scientist

Magnetic structure and dynamics of frustrated magnets

Frustrated magnets are fascinating model systems in which the lattice topology and/or mixed magnetic interactions can lead to an extensively degenerate magnetic ground state.  This leads to novel magnetic structural and dynamical properties in these materials.  I have investigated various metallic systems magnets (β-Mn, YMn2, INVAR) mainly using neutron polarization analysis,  inelastic neutron scattering and muon spin relaxation (μSR) techniques.  I am also interested in the magnetic structural and dynamical properties of antiferromagnetic pyrochlore lattices (Gd2Ti2O7, Gd2Sn2O7) and kagome lattices (herbertsmithite, barlowite) materials. This work is done in collaboration with Dr Jason Gardner (Univ. Indiana/NIST), Dr Georg Ehlers (SNS, Oak Ridge), Dr Joe Paddison (Georgia Tech.) and Dr. Andrew Goodwin (Oxford), addition to various other UK and international research teams.

Polarized Neutron Scattering

Between 1998 and 2008, I worked at the Institut Laue-Langevin in Grenoble, where I led the redesign and reconstruction of the diffuse scattering spectrometer, D7, as part of the ILL Millennium Programme.   I designed a novel supermirror spin-analyser array for D7 which provided a factor of 60 increase in count-rate of this instrument.  I now a member of the the ISIS Polarized Neutron group - which is able to produce highly polarized 3He neutron spin-filters for use on neutron beamlines (currently ISIS reflectometers and LARMOR).  

We are currently in the process of commissionning neutron polarization analysis experiment in the LET cold neutron spectrometer.  

​​External Bodies

  • ​Chair: Magnetism : inelastic applications and spectroscopy panel, MLZ
  • Editorial board: J. Phys: Condens. Matter (Magnetism section)
  • Member of the Institute of Physics (CPhys MInstP)

Teac​hing