MAGNETISM AND SUPERCONDUCTIVITY 56 SPIN-WAVE IN LAYERS AND HETEROSTRUCTURES

There is a renewed interest raised on diluted magnetic semiconductors, because of potential applications in the field of spintronics. These systems are basically obtained by the substitution of cations by Mn2+ in semiconductors based on II-VI compounds. They have the zinc blende (ZB) structure, and present magnetic properties depending on their composition. Superlattices obtained by sandwishing magnetic layers and non-magnetic spacers may be obtained in a large range of composition and thickness. The understanding of the magnetic properties of these systems have given rise to a lot of experimental and theoretical works. An appealing suggestion is to measure the spin-wave dispersion of a paren