Co nanoparticles inserted into a porous carbon amorphous matrix: the role of cooling field and temperature on the exchange bias effect
文献情報
María Paz Fernández-García, Pedro Gorria, Marta Sevilla, Antonio B. Fuertes, Roberto Boada, Jesús Chaboy, Giuliana Aquilanti, Jesús A. Blanco
We 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.
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