Data di Pubblicazione:
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 ยท 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.
Ge(001)2 ยท 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.
Tipologia CRIS:
01.01 Articolo in rivista
Keywords:
diluted magnetic semiconductors; Nanoclusters; Mn5Ge3; MOKE; HRTEM
Elenco autori:
Olivieri, Bruno
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