Part of the Oxford Instruments Group

Split-pair Magnets

Oxford Instruments has pioneered the design of the split-pair magnet systems for many applications including neutron scattering, X-ray scattering and optical spectroscopy. We can combine field orientation, field strength (up to 15 T) with low temperature to provide you with a uniquely powerful measurement platform. Wet, dry and recondensing options are available.

  • Parallel and transverse field access

  • For neutron and X-ray no liquid helium in the beamline and direct access for the beam

  • Simple integration with the beamline infrastructure

  • Designed to specification 

  • Standard 7 T option for SpectromagPT

  • Active shielding possible to minimise stray field footprint 

  • Asymmetric operation possible to allow zero field shift for polarised beams

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There are two standard options for optical spectroscopy, but in most instances the customer requirements are met with bespoke design to suit the customer experiment and environment.

The parameters of field strength, homogeneity and physical size are intimately linked which is why our engineers work with our customers to find the best combination to suit their needs.

Please click here contact someone to discuss your requirements.

Typical high field magnet systems

Field strength: 15 T at 2.2 K, 13.5 T at 4.2 K

Field direction: Vertical

Homogeneity (over 10 mm DSV): 0.5 %

Split at magnet centre line: 20 mm

Split angle: ± 2 degree

Neutron access in the horizontal plane: 330 degree

Sample temperature range: 1.6 - 300 K

The Rutherford Appleton Laboratory purchased two recondensing neutron scattering magnets including a 9 T wide angle and 14 T at 4.2 K. These magnets are used on the LET, MERLIN and WISH target stations at ISIS.

Dr. Oleg Kirichek, Sample Environment Group Leader at ISIS, Rutherford Appleton Laboratory commented: “Having a recondensing system allows us to considerably reduce our helium cost and health and safety issues. It also provides a homogeneous temperature distribution, which is crucial for optimum magnet performance. With these magnets, we should be able to provide our users with high magnetic field sample environments for neutron scattering experiments in a number of research areas such as high temperature superconductors, quantum magnets, spintronic materials, spin frustrated systems, heavy fermions, nanomagnetic materials and the recently discovered iron-based high-temperature superconductors.”

The ILL (Institut Laue-Langevin, Grenoble) received a 10 T asymmetric split pair coil magnet for their three-axis spectrometers. Dr Eddy Lelièvre-Berna, Advanced Neutron Environment Team Leader at ILL commented: “With this new design, the superconducting coils are reliably maintained at low temperature within a liquid Helium bath while considerably reducing the boil-off. Compared with dry systems, the absence of room-temperature bore provides a much larger sample space. It also reduces the amount of material in the beam and avoids unwanted neutron absorption and neutrons scattered to the detectors. Together, we have really made a step forward. Among the many topics to be investigated with this magnet are multiferroic properties, quantum phase transitions and excitations in single-molecule magnets. Our satisfaction is such that we have decided to order another magnet for studying the magnetic substrates of our future hard disks.”

  • Semiconductors Quantum Hall effect
  • Quantum dots
  • Single electron tunnelling
  • Quantum computing Magneto-resistance
  • Hall effect
  • RF transport
  • High frequency conductivity
  • Solid state physics Heavy fermion systems
  • Metal insulator transition
  • Spin glass
  • Mesoscopic systems
  • Giant magnetic resistance Specific heat
  • De Haas-van Alphen oscillations
  • Solid state NMR
  • Electrical resistivity
  • Magneto-resistance
  • Neutron scattering
  • Superconductivity Low Tc superconductors
  • Quantum computing
  • Josephson junctions
  • Flux vortices
  • Quantum initial phenomena Electrical resistivity
  • Scanning spectroscopy (STM/AFM)
  • SQUID characterisation
  • AC susceptibility
  • Astrophysics & cosmology Low temperature detectors
  • Superconducting tunnel junctions
  • Ge bolometers Electrothermal measurements
  • Voltage biased measurements
  • Low energy photon detection
  • Metrology Quantum Hall effect
  • Voltage standards
  • Current standards Magneto-resistance
  • DC & AC low frequency transport and magnetic measurements
  • Single electron tunnelling

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