Abstract
Among the simple models of ferromagnetism, the Stoner model seems to be the most appropriate for transition metals, because it includes the metallic character from its start and allows a natural explanation of optical and photoemission data. The recent measurements of electron spin polarization in transition metals are described. In order to appreciate the difficulty of their interpretation, the recent success in calculating the photoemission yield in noble metals and its theoretical foundation is discussed. Whereas the uniform electron gas provides the information to construct an effective periodic potential in most other metals, it is necessary to invoke the narrow band (Hubbard) Hamiltonian to handle two related effects with direct bearing on ferromagnetism in transition metals: the simultaneous presence of both localized and itinerant behavior of the electrons, and the correlation in a narrow band. Some of the recent theoretical results in this area are recalled, and their possible relevance to electron spin polarization experiments is discussed.
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