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Semimagnetic semiconductors (SMSC) and diluted magnetic
semiconductors (DMS) have in the past decade attracted considerable
attention because they confer many new physical properties on both
bulk materials and heterostructures. These new effects are due
either to exchange interactions between magnetic moments on
magnetic ions, or to exchange interactions between magnetic moments
and the spin of the charge carrier. These effects vary with the
transition metal (Mn, Fe, Co) or rare earth (Eu, Gd, etc) used and
thus provide a range of different situations. The field is very
large (zero gap, small gap, wide gap), and the magnetic properties
also are very rich (paramagnetic spin glass, antiferromagnetism).
These materials are very convenient for studying the magnetism (the
magnetism is diluted) or the superlattices (SL) with a continuous
change from type II SL to type III SL. This Course attempted to
provide a complete overview of the topic. The participants of this
summer school held in Erice came from ten countries and were from
various backgrounds and included theoreticians, experimentalists,
physicists, and chemists. Consequently, an attempt was made to make
the Course as thorough as possible, but at the same time attention
was devoted to basic principles. The lecturers, drawn from all the
groups in the world involved in the field, were asked to be very
didactic in their presentation. After two introductory lectures,
Dr.
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