Abstract
The presence of a ferromagnetic transition in single, modulation-doped quantum wells of Cd 1− x Mn x Te/ Cd 1− y− z Mg y Zn z Te : N is evidenced by magnetospectroscopy. The transition is driven by long-range RKKY interaction between the Mn spins, mediated by the two-dimensional hole gas. Magneto-optic data are well described in terms of a mean-field model. The value of the exchange-field induced by the spin-polarized hole gas is determined. We show that the zero-field splitting which characterizes the ferromagnetic order contains both a p—d exchange term and a contribution due to hole—hole exchange interactions. The initial hole polarization is only partial and increases slowly when the temperature is reduced further below the transition.
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