2008/04/21 by E. Lima Jr, J. M. Vargas, Lima, E. +13
Physics and Astronomy · #FOS: Physical sciences #Other Condensed Matter (cond-mat.other) #cond-mat.other
paper · pdf · doi:10.48550/arxiv.0804.3292
4 pages, 5 figures
arxiv created 2008/04/21 · arxiv updated 2009/12/01
We report unusual magnetic behavior in iron oxide hollow nanospheres of 9.3 nm in diameter. The large fraction of atoms existing at the inner and outer surfaces gives rise to a high magnetic disorder. The overall magnetic behavior can be explained considering the coexistence of a soft superparamagnetic phase and a hard phase corresponding to the highly frustrated cluster-glass like phase at the surface regions.