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Experiments using spin-polarised low-energy electrons provide direct access to surface magnetic properties by separately probing the exchange-split majority and minority electronic states to an information depth of just a few atomic layers. This is demonstrated by results from two types of experiments: (i) magnetometry with secondary electrons gives information on the magnetisation as a function of the field and temperature as well as on the exchange coupling at a ferromagnetic surface or between ultrathin magnetic films; (ii) spin- and angular-resolved inverse photoemission allows detailed study of the spin-dependent empty electronic structure, thereby complementing information gained by photoemission on the occupied states. Results on energy versus momentum dispersion, exchange splitting of bulk and surface states, and adsorbate-induced changes of the spin-dependent electronic structure contribute to a microscopic picture of ferromagnetism at surfaces. The spin dependence of interface states is important for understanding magnetic coupling phenomena in thin film structures.

Additional information

Authors: DONATH M, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article: Surface Science, Vol. 287-288 (1993) pp. 722-731
Record Number: 199311071 / Last updated on: 1994-11-29
Original language: en
Available languages: en