We investigated the structural and magnetic properties of MnxGe1x, with 0.02 6 x 6 0.1. The MnxGe1x samples were grown on Ge(001)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 MnxGe1x 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.
Structural and magnetic properties of Mn5Ge3 nanoclusters dispersed
A Generosi;
2007
Abstract
We investigated the structural and magnetic properties of MnxGe1x, with 0.02 6 x 6 0.1. The MnxGe1x samples were grown on Ge(001)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 MnxGe1x 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
