Pairs of self-assembled InMnAs quantum dot structures and reference epitaxial layers (0 < x < 0.13) were prepared on GaAs substrates by low-pressure metal organic vapour phase epitaxy. Magnetic moment measurements indicated that reference epitaxial layer had a Curie temperature of 343K independent on the composition. On the other hand, the quantum dots prepared under Stranski-Krastanov growth mode from the identical gas phase composition showed a lower value of Curie temperature. This value varied from 41 to 235K in relation to the material composition. Moire fringes at transmission electron microscopy plan view were used for characterization of strain in InMnAs quantum dot structures. (C) 2010 Elsevier B.V. All rights reserved.