Author/Authors :
De Padova، نويسنده , , P. and Favre، نويسنده , , L. and Berbezier، نويسنده , , I. and Olivieri، نويسنده , , B. and Generosi، نويسنده , , A. and Paci، نويسنده , , B. and Rossi Albertini، نويسنده , , V. and Perfetti، نويسنده , , P. and Quaresima، نويسنده , , C. and Mariot، نويسنده , , J.-M. and Taleb-Ibrahimi، نويسنده , , A. and Richter، نويسنده , , M.C. and Heckmann، نويسنده , , O. and D’Orazio، نويسنده , , F. and Lucari، نويسنده , , F. and Hricovini، نويسنده , , K.، نويسنده ,
Abstract :
We investigated the structural and magnetic properties of MnxGe1−x, with 0.02 ⩽ x ⩽ 0.1. The MnxGe1−x samples were grown on Ge(0 0 1)2 × 1 by molecular beam epitaxy, at a substrate temperature of 520 K. The samples were characterized in situ by reflection high-energy electron diffraction and ex situ by high-resolution transmission electron microscopy, energy dispersive X-ray reflectivity and magneto-optical Kerr effect. From microscopy images we evidenced on all samples the presence of Mn5Ge3 nanocrystallites in addition to the MnxGe1−x diluted magnetic semiconductor with an estimated Mn concentration x ≈ 1.5%. The size and the density of the Mn5Ge3 precipitates were found to increase with increasing the Mn concentration x. Magnetic analysis showed ferromagnetism with a Curie temperature of 280 K for all samples.
Keywords :
HRTEM , EDXR , MnGe diluted magnetic semiconductor , Mn5Ge3 nanoclusters , MOKE
