| Autor: |
Petit, Matthieu, Dau, Minh Tuan, Monier, Guillaume, Michez, Lisa, Barre, Xavier, Spiesser, Aurelie, Thanh, Vinh Le, Glachant, Alain, Coudreau, Cyril, Bideux, Luc, Robert-Goumet, Christine |
| Zdroj: |
Physica Status Solidi (C); Jun2012, Vol. 9 Issue 6, p1374-1377, 4p |
| Abstrakt: |
The Curie temperature of Mn5Ge3 has been successfully enhanced by carbon doping. In this context the diffusion of a carbon thin film in Mn5Ge3 has been studied at room temperature. A value of the diffusivity of about D = 2.4 × 10-23 ± 0.5 × 10-23 m2 s-1 is reported. This value is in the typical range of interstitial diffusion coefficients. Moreover Auger Ge and Mn peaks shifts and Ge3d core level have been investigated to get some details on the reactivity of carbon atoms in Mn5Ge3. Mn Auger transitions display a shift of 4 eV whereas Ge transitions do not. Similarly Ge3d core level does not contain C related contribution but presents a Mn one. These observations confirmed the fact that carbon atoms are not inert species for Mn. It suggests that a ternary Ge-Mn-C alloy could occur and should be taken into account when doping the Mn5Ge3 with carbon. (© 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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