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We have also constructed a miniature Mott spin detector to provide a direct measure of the spin polarization of these bands.
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Many of the materials that we are interested in are magnetic. This means that the electronic structures contain additional spin-dependent properties that are not revealed in a simple photoemission experiment.
By using a spin detector we can probe this additional quantum number. This is an especially valuable measurement in the materials we make since ultra-thin films and materials with structures not found in nature may have significant departures from expectations based on bulk materials. |
This detector is based on the asymmetry in spin-orbit scattering of electrons. It operates in a spin-sensitive mode and a spin integrated mode where a set of microchannel plates are positioned at the entrance to the detector.
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We operate a conventional 50 mm hemispherical analyzer on a 2-axis goniometer. This instrument allows us to map the electronic band structures of our films and surfaces. 