Abstract
Angle scanned photoemission experiments that map the electronic band structure up to 5k BT above the Fermi level are reviewed. After a short tutorial of the basic principles for the interpretation of angular resolved photoemission (ARUPS) experimental data on the band ferromagnet nickel are presented. The exchange splitting of the sp-bands and the d-bands can be accurately determined. The influence of the temperature and adsorbate layers on the magnetism of the surface are investigated.
For clean nickel metal the ferromagnetic - paramagnetic phase transition is observed in detail. It is found that the exchange splitting follows - within the accuracy of the experiment - the bulk magnetization and disappears at the Curie temperature [1]. A magnetically “active” region in k-space, where sp and d minority bands coincide on the Fermi surface is inspected.
A monolayer of hexagonal boron nitride on Ni(111) strongly influences the Fermi surface of the interface. The formally insulating h-BN acts as an atomic grating and induces umklapp processes. It is seen how the exchange splitting is affected and that the overlayer changes the relative spin asymmetry of exchange split sp-bands.
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Greber, T. (2001). Probing the Electronic States of Band Ferromagnets with Photoemission. In: Baberschke, K., Nolting, W., Donath, M. (eds) Band-Ferromagnetism. Lecture Notes in Physics, vol 580. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-44610-9_7
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