Interlayer Exchange Coupling in Short Period GaMnAs/GaAs Superlattices |
| W. Szuszkiewicz, E. Dynowska Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland B. Hennion, F. Ott Laboratoire Leon Brillouin, CE Saclay, 91191 Gif-sur-Yvette cedex, France M. Jouanne, J.F. Morhange Laboratoire des Milieux Desordonnes et Heterogenes, UPMC 4, pl. Jussieu, 75252 Paris, France M. Karlsteen and J. Sadowski Department of Experimental Physics, Chalmers University of Technology Göteborg, Sweden |
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| The low dimensional structures containing III--V ferromagnetic semiconductors were intensively investigated in the last few years because of the variety of their potential applications. The aim of the present work was to study the interlayer exchange coupling in the short period GaMnAs/GaAs superlattices containing 16 or 8 GaMnAs monolayers. Samples with the magnetic layers corresponding to the mixed crystal composition with 5% or 6% of Mn were grown by MBE technique and characterized by both high-resolution X-ray diffraction and Raman scattering methods. Folded acoustic phonons were observed for the first time for this particular quantum system in the Raman scattering spectra. The interlayer exchange coupling in selected superlattices was investigated by both elastic neutron scattering (diffraction) and polarized neutron reflectivity measurements. Presence of the smooth interfaces and the stability of the superlattice period were confirmed by neutron reflectometry data. Ferromagnetic correlation of the magnetization vector in subsequent GaMnAs magnetic layers was demonstrated by both experimental methods. |
| DOI: 10.12693/APhysPolA.100.335 PACS numbers: 61.12.--q, 75.25.+z, 78.30.Fs |