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Erasing the glassy state in magnetic fine particles
García del Muro y Solans, Montserrat; Batlle Gelabert, Xavier; Labarta, Amílcar
Universitat de Barcelona
BaFe10.4Co0.8Ti0.8O19 magnetic fine particles exhibit most of the features attributed to glassy behavior, e.g., irreversibility in the hysteresis loops and in the zero-field-cooling and field-cooling curves extends up to very high fields, and aging and magnetic training phenomena occur. However, the multivalley energy structure of the glassy state can be strongly modified by a field-cooling process at a moderate field. Slow relaxation experiments demonstrate that the intrinsic energy barriers of the individual particles dominate the behavior of the system at high cooling fields, while the energy states corresponding to collective glassy behavior play the dominant role at low cooling fields.
04-05-2010
Propietats magnètiques
Vidres de spin
Magnetic properties
Spin glasses
(c) The American Physical Society, 1999
Artículo
The American Physical Society
         

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