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
Rok vydání:	2011
Předmět:	Materials science Magnetic moment Magnetic structure General Physics and Astronomy chemistry.chemical_element Magnetic susceptibility Carbide Condensed Matter::Materials Science Magnetic anisotropy Nuclear magnetic resonance chemistry Amorphous carbon Chemical physics Magnetic nanoparticles Cobalt
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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