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Co nanoparticles inserted into a porous carbon amorphous matrix: The role of cooling field and temperature on the exchange bias effect

AuthorsFernández-García, Maria Paz; Gorria, P.; Sevilla Solís, Marta ; Fuertes Arias, Antonio Benito ; Boada, R.; Chaboy, Jesús; Aquilanti, G.; Blanco, J. A.
Issue Date2011
PublisherRoyal Society of Chemistry (UK)
CitationPhysical Chemistry Chemical Physics 13(3): 927-932 (2011)
AbstractWe report unusual cooling field dependence of the exchange bias in oxide-coated cobalt nanoparticles embedded within the nanopores of a carbon matrix. The size-distribution of the nanoparticles and the exchange bias coupling observed up to about 200 K between the Co-oxide shell (--3–4 nm) and the ferromagnetic Co-cores (--4–6 nm) are the key to understand the magnetic properties of this system. The estimated values of the effective anisotropy constant and saturation magnetization obtained from the fit of the zero-field cooling and field cooling magnetization vs. temperature curves agree quite well with those of the bulk fcc-Co.
Identifiersdoi: 10.1039/C0CP00396D
issn: 1463-9076
e-issn: 1463-9084
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