Abstract
Magnetic circular dichroism is used to investigate the evolution of ferromagnetism in the -type magnetic semiconductor . 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.
- Received 19 March 1999
DOI:https://doi.org/10.1103/PhysRevLett.83.3073
©1999 American Physical Society