Surface Effects in Maghemite Nanoparticles

Millan, A. ; Urtizberea, A. ; Silva, N. J. O. ; Palacio, F. ; Amaral, V. S. ; Snoeck, E. ; Serin, V.

Resumen: A 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.

Idioma: Inglés

DOI: 10.1016/j.jmmm.2006.09.011

Año: 2007

Publicado en: Journal of Magnetism and Magnetic Materials 312, 1 (2007), L5-L9
ISSN: 0304-8853

Factor impacto JCR: 1.704 (2007)

Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 47 / 184 = 0.255 (2007) - Q2 - T1
Categ. JCR: PHYSICS, CONDENSED MATTER rank: 20 / 59 = 0.339 (2007) - Q2 - T2

Financiación: info:eu-repo/grantAgreement/ES/CICYT/MAT2004-03395-C02-01

Tipo y forma: Artículo (PostPrint)