'Magnetricity' observed and measured for the first time at ISIS

A magnetic charge can behave and interact just like an electric charge in some materials, according to new research conducted at STFC`s ISIS facility and led by the London Centre for Nanotechnology (LCN) which could lead to a reassessment of current magnetism theories, as well as significant technological advances.

The research, published today in Nature, proves the existence of atom-sized `magnetic charges` that behave and interact just like more familiar electric charges. It also demonstrates a perfect symmetry between electricity and magnetism – a phenomenon dubbed ‘magnetricity` by the authors from the LCN and the STFC`s ISIS Neutron and Muon Source.

In order to prove experimentally the existence of magnetic current for the first time, the team mapped Onsager`s 1934 theory of the movement of ions in water onto magnetic currents in a material called spin ice. They then tested the theory by applying a magnetic field to a spin ice sample at a very low temperature and observing the process using muons at ISIS.

The experiment allowed the team to detect magnetic charges in the spin ice (Dy2Ti2O7), to measure their currents, and to determine the elementary unit of the magnetic charge in the material. The monopoles they observed arise as disturbances of the magnetic state of the spin ice, and can exist only inside the material.

Professor Steve Bramwell, LCN co-author of the paper, said "Magnetic monopoles were first predicted to exist in 1931, but despite many searches, they have never yet been observed as freely roaming elementary particles. These monopoles do at least exist within the spin ice sample, but not outside.

"It is not often in the field of physics you get the chance to ask `How do you measure something?` and then go on to prove a theory unequivocally. This is a very important step to establish that magnetic charge can flow like electric charge. It is in the early stages, but who knows what the applications of magnetricity could be in 100 years time."

Professor Keith Mason, Chief Executive of STFC said "The unequivocal proof that magnetic charge is conducted in spin ice add significantly to our understanding of electromagnetism. Whilst we will have to wait to see what applications magnetricity will find in technology, this research shows that curiosity driven research will always have the potential to make an impact on the way we live and work. Advanced materials research depends greatly on having access to central research labs like ISIS allowing the UK science community to flourish and make exciting discoveries like this."

Dr Sean Giblin, instrument scientist at ISIS and co-author of the paper, added "The results were astounding, using muons at ISIS we are finally able to confirm that magnetic charge really is conducted through certain materials at certain temperatures – just like the way ions conduct electricity in water."

---

Notes to editors

Images are available - please contact the press office for more details.

Contacts

• Lucy Stone
  Press Officer
  STFC Rutherford Appleton Laboratory
  Tel: +44 (0)1235 445 627
  Mob: +44 (0)7920 870 125

London Centre for Nanotechnology

The London Centre for Nanotechnology (link opens in a new window) is a UK-based, multidisciplinary research centre forming the bridge between the physical and biomedical sciences. It was conceived from the outset with a management structure allowing for a clear focus on scientific excellence, exploitation and commercialisation. It brings together two world leaders in nanotechnology, namely University College London and Imperial College London, in a unique operating model that accesses the combined skills of multiple departments, including medicine, chemistry, physics, electrical and electronic engineering, biochemical engineering, materials and earth sciences, and two leading technology transfer offices.

The London Centre for Nanotechnology has a open access scheme for media to access information on research and technology.

University College London (UCL)

Founded in 1826, University College London (link opens in a new window) (UCL) was the first English university established after Oxford and Cambridge, the first to admit students regardless of race, class, religion or gender, and the first to provide systematic teaching of law, architecture and medicine.

UCL is the fourth-ranked university in the 2009 THES-QS World University Rankings, and the third-ranked UK university in the 2008 league table of the top 500 world universities produced by the Shanghai Jiao Tong University. UCL alumni include Marie Stopes, Jonathan Dimbleby, Lord Woolf, Alexander Graham Bell, and members of the band Coldplay. UCL currently has over 12,000 undergraduate and 8,000 postgraduate students. Its annual income is over £600 million.

ISIS Pulsed Neutron and Muon Source

ISIS is a world-leading centre for research in physical and life sciences operated by the STFC at the Rutherford Appleton Laboratory (RAL), Didcot, Oxfordshire, UK.

ISIS supports an international community of over 2000 scientists who use neutrons and muons for research in physics, chemistry, materials science, geology, engineering and biology. It is the most productive research centre of its type in the world.

Neutron scattering is a vital research and analysis technique in exploring the structure and dynamics of materials and molecules. It provides unique and complementary information to that available from synchrotron light sources.

The ISIS Second Target Station Project complements the facilities already operating at ISIS and enables the science programme to expand into the key research areas of soft matter, advanced materials and bio-science.

About STFC.