The magnetic properties of Co HCP nanoparticles dispersed in a silica matrix with sizes between 2±0.7 and 5±2.2 nm were investigated. The temperature dependence of zero-field cooled and field cooled magnetizations and of the coercive field were analyzed considering the thermal activated demagnetization process. Enhanced anisotropy was observed for the 2 nm nanoparticles, while the demagnetization process of the larger ones is dominated by interparticle interactions

Superparamagnetism and coercivity in HCP-Co nanoparticles dispersed in silica matrix

DE JULIAN FERNANDEZ, CESAR;MATTEI, GIOVANNI;MAZZOLDI, PAOLO
2004

Abstract

The magnetic properties of Co HCP nanoparticles dispersed in a silica matrix with sizes between 2±0.7 and 5±2.2 nm were investigated. The temperature dependence of zero-field cooled and field cooled magnetizations and of the coercive field were analyzed considering the thermal activated demagnetization process. Enhanced anisotropy was observed for the 2 nm nanoparticles, while the demagnetization process of the larger ones is dominated by interparticle interactions
2004
Journal of Magnetism and Magnetic Materials
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2488870
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