C. Girardeaux, et al.
J. Phys. IV France 132 (2006) 231-235
Structural and magnetic properties of Ge Mn/Ge(001) 2 1 diluted magnetic semiconductorsP. De Padova1, C. Quaresima1, P. Perfetti1, N. Zema1, C. Grazioli1, M. Veronese1, B. Olivieri2, M.C. Richter3, O. Heckmann3, F. D'Orazio4, F. Lucari4 and K. Hricovini3
1 CNR-ISM, via Fosso del Cavaliere, 00133 Roma, Italy
2 CNR-ISAC, via Fosso del Cavaliere, 00133 Roma, Italy
3 LMPS, Université de Cergy-Pontoise, Neuville/Oise, 95031 Cergy-Pontoise, France
4 INFM-Dipartimento di Fisica, Univ. di L'Aquila, Via Vetoio-Coppito, I-67010 L'Aquila, Italy
Structural and magnetic properties of Ge Mn alloys, epitaxially grown on a Ge(001) surface have been investigated. We prepared Ge Mn films by MBE as a function of substrate temperature and Mn concentration x. In-situ RHEED was used to monitor the streaks of the Ge Mn epitaxial films. The optimal temperature, to obtain a very well-ordered epitaxial Ge Mn alloy, for Mn concentrations of , and , was found to be 525 K. Ex-situ magneto-optical Kerr effect and XMCD at the L2/3 Mn2p absorption edges on Ge Mn films, show isotropic magnetic properties. The Curie temperature of about 270 K was found on most of the ordered samples.
© EDP Sciences 2006