Abstract
Dilute magnetic semiconductors (DMSs) constitute a class of interesting and important materials for potential applications in spintronics. The recent discovery of isovalent Fe-doped $I\phantom{\rule{0}{0ex}}I\phantom{\rule{0}{0ex}}I\ensuremath{-}V$ semiconductors with very high Curie temperature ${T}_{C}$ has opened an avenue for DMS development---and also a challenge to the existing theory of magnetic coupling in semiconductors. This study presents a mechanism for the ferromagnetism of isovalent Fe-doped DMSs and explains the origin of their high ${T}_{C}$, which hopefully will accelerate their development. In these materials the key is a particular $p\ensuremath{-}d$ orbital coupling with charge transfer to the iron.
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