Light controlled and probed ferromagnetism of (Cd,Mn)Te quantum wells

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.


Published in:
Physica E-Low-Dimensional Systems & Nanostructures, 12, 1-4, 344-350
Year:
2002
ISSN:
1386-9477
Keywords:
Note:
Univ Warsaw, Inst Expt Phys, PL-00681 Warsaw, Poland. Univ Grenoble 1, Grenoble, France. CNRS, Spectrometrie Phys Lab, Grenoble, France. EPFL, Fed Inst Technol, Dept Phys, IMO, CH-1015 Lausanne, Switzerland. Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland. Polish Acad Sci, Coll Sci, PL-02668 Warsaw, Poland. Kossacki, P, Univ Warsaw, Inst Expt Phys, Hoza 69, PL-00681 Warsaw, Poland.
ISI Document Delivery No.: 545FL
Times Cited: 6
Cited Reference Count: 26
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 Record created 2007-08-31, last modified 2018-03-17


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