Abstract
Diluted magnetic semiconductors have been shown to be excellent hosts in which to study the fundamental exchange interaction of a carrier with localized fluctuating magnetic spins. New low-temperature optical spectroscopy techniques using integrated DC SQUIDs have allowed sensitive magnetization studies in Cd 1− x Mn x Te superlattices as the magnetic layer thickness was systematically reduced towards the two-dimensional limit. Static and picosecond measurements reveal the magnetic manifestations of carrier localization in these electronic quantum wells.
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