Macroscopic behavior and microscopic magnetic properties of nanocarbon

作者：Landeranta E^*; Ryzhov V A; Lashkul A V; Galimov D M; Titkov A N; Matveev V V; Mokeev M V; Kurbakov A I; Lisunovg K G

来源：Journal of Magnetism and Magnetic Materials, 2015, 383: 78-82.

DOI：10.1016/j.jmmm.2014.10.104

• Nanocarbon
• Neutron diffraction
• NMR
• Magnetic properties

Here are presented investigations of powder and glass like samples containing carbon nanoparticles, not intentionally doped and doped with Ag. Au and Co. The neutron diffraction study reveals an amorphous structure of the samples doped with An and Co, as well as the magnetic scattering due to a long-range FM order in the Co-doped sample. The composition and molecular structure of the sample doped with Au is clarified with the NMR investigations. The temperature dependence of the magnetization, M (T), exhibits large irreversibility in low fields of B=1-7 mT. M (B) saturates already above 2 Tat high temperatures, but deviates from the saturation behavior below similar to 50 (150 K). Magnetic hysteresis is observed already at 300 K and exhibits a power-law temperature decay of the coercive field, B-c (T). The macroscopic behavior above is typical of an assembly of partially blocked magnetic nanoparticles. The values of the saturation magnetization, M-s, and the blocking temperature, T-b, are obtained as well. However, the hysteresis loop in the Co-doped sample differs horn that in other samples, and the values of B, and M, are noticeably increased.

• 出版日期2015-6-1