Abstract
Magnetic circular dichroism is used to investigate the evolution of ferromagnetism in the $p$-type magnetic semiconductor $({\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x})\mathrm{As}$. Local Mn moments and holes produce two spectroscopically distinct contributions, whose properties reveal an antiferromagnetic Mn-hole alignment in the ferromagnetic state. These components are present in both metallic and insulating samples with different temperature and field dependences, suggesting that the holes play a more active role in mediating the ferromagnetic exchange than in traditional RKKY systems.
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