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Interparticle magnetic correlations in a nanosized g-Fe2O3 system
- Source :
- Journal of magnetism and magnetic materials 272 (2004): e1173., info:cnr-pdr/source/autori:Carsughi F., Baio G., Rinaldi D., Guidi T., Caciuffo R., Fiorani D./titolo:Interparticle magnetic correlations in a nanosized g-Fe2O3 system/doi:/rivista:Journal of magnetism and magnetic materials/anno:2004/pagina_da:e1173/pagina_a:/intervallo_pagine:e1173/volume:272
- Publication Year :
- 2004
- Publisher :
- North-Holland :, Amsterdam , Paesi Bassi, 2004.
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Abstract
- Small angle neutron scattering experiments performed on a powder of gamma-Fe2O3 nanoparticles reveal the existence of a temperature-dependent magnetic signal, increasing with decreasing temperature. The extra scattering appearing below 275 K is fitted to the sum of a Lorentzian and a Lorentzian squared. The first contribution is attributed to the spin correlations in the particle core, with a correlation length of 2.6 nm at T = 4 K. The second contribution indicates the presence of frozen clusters of coupled particles, with a correlation length that increases with decreasing temperature, up to 60 nm.
Details
- Database :
- OpenAIRE
- Journal :
- Journal of magnetism and magnetic materials 272 (2004): e1173., info:cnr-pdr/source/autori:Carsughi F., Baio G., Rinaldi D., Guidi T., Caciuffo R., Fiorani D./titolo:Interparticle magnetic correlations in a nanosized g-Fe2O3 system/doi:/rivista:Journal of magnetism and magnetic materials/anno:2004/pagina_da:e1173/pagina_a:/intervallo_pagine:e1173/volume:272
- Accession number :
- edsair.cnr...........4728413b1e5954887a6486353ed51c50