doi:10.1016/j.jmmm.2006.09.011engMillan, A.Urtizberea, A.Silva, N. J. O.Palacio, F.Amaral, V. S.Snoeck, E.Serin, V.Surface Effects in Maghemite NanoparticlesART-2007-65622A consistent model is presented for the variation of saturation magnetization with particle size in maghemite nanoparticles, based on the existence of a magnetically disordered layer with a constant thickness of 1 nm. For particles smaller than 3 nm, layer thickness increases rapidly, and MS is already zero for 2.5 nm particle size. Magnetization measurements have been performed on maghemite–polymer nanocomposites with low size dispersion and a regular distribution of particles in the matrix. A representative number of samples have been studied with a diameter size in the range from 1.5 to 15 nm and ±10% of size dispersion.2007http://zaguan.unizar.es/record/13214310.1016/j.jmmm.2006.09.011http://zaguan.unizar.es/record/132143oai:zaguan.unizar.es:132143info:eu-repo/grantAgreement/ES/CICYT/MAT2004-03395-C02-01Journal of Magnetism and Magnetic Materials 312, 1 (2007), L5-L9by-nc-ndhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccess