Oxford Instruments specialises in the design, manufacture and support of innovative solutions, tools and systems for the emerging nanotechnology markets in areas such as XRF (X-ray Fluorescence) analysers , microanalysis systems, superconducting wires, NMR (nuclear magnetic resonance) magnets, cryogenic systems, plasma etch and deposition low temperature environments and coating thickness measurement.

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Spectromag® magneto-optical superconducting magnet system

Spectromag superconducting magnet with optical cryostat for magneto-optical studies

Spectromag magneto-optical superconducting magnet system

The Spectromag split-pair superconducting magnet system provides optical access to a sample in a  variable horizontal magnetic field and low temperature environment. System features include:

  • Magnetic fields up to 11 T in a compact geometry
  • Inserts to provide sample temperatures from 0.45 to 300 K with optical access
  • Cryostat incorporating rectangular tail unit, providing excellent optical access to the sample
  • Wide range of windows for measurements from near ultra-violet to far infra-red
  • Option for fully automatic control

The Spectromag split pair magnet systems are optimised for magneto-optical measurements such as magnetic circular dichroism (MCD), Mössbauer and Raman spectroscopy, photoluminescence studies and Faraday effect measurements.


Get your Spectromag before the academic year starts!

A limited number of 7(8) T systems are now available from stock for shipment within 2 weeks of order1. Use the Enquiries form or email us to reserve your system.
1subject to your choice of window material


Superconducting magnet

The rectangular tail contains the split pair magnet mounted so that the field direction is horizontal and provides:

  • 4 sets of optical windows in strain-free mounts
  • Choice of 7 (8) T  or 10 (11) T at 4.2 (2.2) K
  • Homogeneity 0.6% over a 10 mm diameter sphere
  • Field sweep rate up to 1 T/min
  • Stability in persistent mode <0.01%/hour
  • Low LHe boil-off with >100 hour static liquid helium hold time

The magnet tail is designed to reduce the volume of helium around the magnet, and maximise the optical access; there is no liquid helium in the optical path.

Sample temperature and wiring

The standard insert provides sample temperatures in the range 1.5 - 300 K and a clear sample space of 25 mm diameter. Top loading allows samples to be changed while the system is cold and the magnet is at field.

The standard sample rod permits ±15 mm axial adjustment and full 360° rotation about the vertical axis. There are 3 electrical (Fischer) 10 way connectors, all of which may be pre-wired.

Options

  • Windows
    • A wide range of window materials can be fitted to the Spectromag to meet specific spectroscopy applications
  • Enhanced sample space
    • A modified insert is available that allows measurements on samples up to 30 mm diameter, but with a restricted temperature range
  • HelioxTL
    • This 3He insert provides sample temperatures in the range 0.45 - 80 K, supplied either as an alternative to the standard insert or as an interchangeable unit. Changing inserts is an easy operation that takes just a few hours. The sample region has 25 mm diameter access and is fitted with a set of 4 radial Spectrosil B windows in strain-free mounts. The sample rod has a wired 24-way Fischer connector.
  • Sample rods
    • The second and third electrical connector can be supplied pre-wired
    • Special sample rods are also available to provide precision movement of the sample about vertical and horizontal axes
    • Automatic control using a stepper motor is usually possible.
  • Control
    • All standard electronic items are provided with LabVIEW drivers to allow control of the sample temperature and magnetic field. Integration with other virtual instruments provides full experimental control.
  • Special magnets
    • Vertical field split pair magnets
      • These systems have the magnet oriented with the field axis vertical but are otherwise identical to the standard Spectromag. Special systems are also available for Mössbauer spectroscopy with a vertical cooled source/absorber configuration.
    • Horizontal field solenoids with RT bores
      • The standard Spectromag cryostat may be fitted with an alternative tail set containing a horizontally mounted magnet with a room temperature bore; these are particularly suited to beamline experiments. Standard magnets are available to 11 tesla with 50 mm RT bore; samples can be cooled to 2.7 K using a separate continuous flow cryostat.
    • Vertical field solenoids with axial optical access only
      • The standard Spectromag cryostat may be fitted with vertical solenoids up to 18 T.  These systems have 1.5 - 300 K inserts provided with one set of Spectrosil B quartz windows in the base. Special systems are also available for Mössbauer spectroscopy with a vertical cooled source/absorber configuration.
    • High homogeneity magnets
      • For measurements such as optically detected magnetic resonance (ODMR) and electron paramagnetic resonance (EPR), enhanced homogeneity magnets (to 10 ppm) are available.

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