Structural and magnetic properties of Mn5Ge3 nanoclusters dispersed in MnxGe1−x/Ge(0 0 1)2 × 1 diluted magnetic semiconductors - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Surface Science : A Journal Devoted to the Physics and Chemistry of Interfaces Année : 2007

Structural and magnetic properties of Mn5Ge3 nanoclusters dispersed in MnxGe1−x/Ge(0 0 1)2 × 1 diluted magnetic semiconductors

Résumé

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.

Dates et versions

hal-01811429 , version 1 (08-06-2018)

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P. de Padova, Luc Favre, Isabelle Berbezier, B. Olivieri, B. Paci, et al.. Structural and magnetic properties of Mn5Ge3 nanoclusters dispersed in MnxGe1−x/Ge(0 0 1)2 × 1 diluted magnetic semiconductors. Surface Science : A Journal Devoted to the Physics and Chemistry of Interfaces, 2007, 601 (18), pp.4370--4374. ⟨10.1016/j.susc.2007.06.020⟩. ⟨hal-01811429⟩
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