Regensburg 2004 – scientific programme

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HL: Halbleiterphysik

HL 12: Poster I

HL 12.74: Poster

Monday, March 8, 2004, 16:30–19:00, Poster A

Growth studies and n-type doping of Zn_1−xMn_xSe semimagnetic heterostructures — •B. Daniel¹, P. Baumann¹, K.C. Agarwal¹, C. Klingshirn¹, M. Hetterich¹, D. Litvinov², P. Pfundstein², and D. Gerthsen² — ¹Institut für Angewandte Physik and Center for Functional Nanostructures (CFN), Universität Karlsruhe, D-76131 Karlsruhe, Germany — ²Laboratorium für Elektronenmikroskopie and CFN, Universität Karlsruhe, D-76128 Karlsruhe, Germany

Zn_1−xMn_xSe - either as an alloy or as a short-period ZnSe/MnSe superlattice - exhibits interesting magnetic and magneto-optical phenomena. In particular it has recently been demonstrated to be useful as a spin aligner, an important ingredient for a future spin-based electronics. In this contribution we investigate the growth of these materials by molecular-beam epitaxy. In situ RHEED measurements of the in-plane lattice parameter are used to monitor the elastic and plastic strain relaxation in thin MnSe layers deposited on top of ZnSe. Additionally, transmission electron microscopy of samples containing several MnSe layers with increasing thickness is used in order to determine the critical thickness for MnSe/ZnSe. Finally, we have fabricated n-doped Zn_1−xMn_xSe:Cl material with various compositions. The grown epilayers are characterized electrically by Hall measurements in the van der Pauw geometry and optically by infrared reflection spectroscopy carried out in a Fourier transform spectrometer.