Light controlled and probed ferromagnetism of (Cd,Mn)Te quantum wells
- Kossacki, P.
- Kudelski, A.
- Gaj, J. A.
- Cibert, J.
- Tatarenko, S.
- Ferrand, D.
- Wasiela, A.
- Deveaud, B.
- Dietl, T.
DOIAbstract
Properties of carrier-induced ferromagnetism in modulation-doped quantum wells of p-type (Cd,Mn)Te are assessed by photoluminescence (PL) and PL excitation spectroscopy. Well-chosen illumination makes it possible to deplete the quantum well and thus to control the strength of the ferromagnetic interactions. Spontaneous local magnetization is proportional to the hole concentration p but the Curie temperature T-C varies little over a wide p range, in agreement with the mean-field model for 2D systems. The spatial extension zeta of ferromagnetic correlation is probed by micro- and time-resolved PL and possible mechanisms controlling zeta below T-C are discussed. (C) 2002 Elsevier Science B.V. All rights reserved
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