Demixing in cobalt clusters embedded in a carbon matrix evidenced by magnetic measurements
Autor: | Florent Tournus, Véronique Dupuis, Spiros Zafeiratos, Arnaud Hillion, J. Tuaillon-Combes, Matthias Hillenkamp, Alexandre Tamion, O. Boisron |
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Rok vydání: | 2011 |
Předmět: | |
Zdroj: | Journal of Applied Physics. 110:063904 |
ISSN: | 1089-7550 0021-8979 |
Popis: | We report on the magnetic properties of cobalt clusters embedded in amorphous carbon using magnetic and structural investigations. From the analysis of the mFC, mZFC, and m(H) curves, we determine the Co magnetic diameter probability density function. An initially magnetically dead interface layer is attributed to a metastable carbide. We found that annealing at 750 K favors the graphitization of the matrix and removes the dead layer without deteriorating the nanoparticle size distribution or changing the magnetic anisotropy constant. |
Databáze: | OpenAIRE |
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