A Bolt-On Source of Spin Polarised Electrons for Studies of Surface Magnetism

  • Fredrik Schedin
  • Ranald Warburton
  • Geoff Thornton
Part of the Physics of Atoms and Molecules book series (PAMO)


Experiments with spin-polarised electrons are rapidly gaining importance due to their ability to selectively measure the exchange-split majority- and minority-spin electronic states. By employing the inverse photoemission process with its small probing depth, information about surface magnetism can additionally be obtained. In this chapter a description will be given of a versatile and transportable spin-polarised electron gun for angle-resolved spin-polarised inverse photoemission spectroscopy (ARSPIPES) experiments. A GaAs(001) single crystal is employed to obtain spin-polarised electrons by photoemission with circularly polarised light. To obtain a transversely polarised beam, which has the objective of optimising the spin-dependent interaction with a sample magnetised in the surface plane, a 90° electrostatic spherical sector is used to deviate the direction but not the spin of the electrons. A set of electrostatic lenses are employed in order to transport and focus the electrons onto a target of investigation. A brief description of results obtained with this apparatus will be given.


Photon Detector Gate Valve Spin Splitting Spin Channel Exchange Splitting 
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Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • Fredrik Schedin
    • 1
  • Ranald Warburton
    • 1
  • Geoff Thornton
    • 1
  1. 1.Interdisciplinary Research Centre in Surface Science and Chemistry DepartmentUniversity of ManchesterManchesterUK

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