Demixing in cobalt clusters embedded in a carbon matrix evidenced by magnetic measurements

作者：Tamion Alexandre^*; Hillenkamp Matthias; Hillion Arnaud; Tournus Florent; Tuaillon Combes Juliette; Boisron Olivier; Zafeiratos Spiros; Dupuis Veronique

来源：Journal of Applied Physics, 2011, 110(6): 063904.

DOI：10.1063/1.3638035

We report on the magnetic properties of cobalt clusters embedded in amorphous carbon using magnetic and structural investigations. From the analysis of the m(FC), m(ZFC), 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.

• 出版日期2011-9-15