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Detection of the onset of nanocrystallization by calorimetric and magnetic measurements

Opened Access Detection of the onset of nanocrystallization by calorimetric and magnetic measurements

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Autor: Blázquez Gámez, Javier Sebastián
García Franco, Victorino
Conde Amiano, Clara Francisca
Conde Amiano, Alejandro
Roth, S.
Departamento: Universidad de Sevilla. Departamento de Física de la Materia Condensada
Fecha: 2005-01-24
Publicado en: Journal of Applied Physics, 97,  044308
Tipo de documento: Artículo
Resumen: It is generally accepted that measurements of the magnetic properties are more sensitive than measurements of the enthalpy changes in the detection of the onset of crystallization of ferromagnetic phases emerging from a paramagnetic amorphous alloy. In this work, it is shown that the formation of a very fine nanocrystalline microstructure can make this assumption incorrect. Under some circumstances, the nanocrystallization onset temperature obtained from magnetic techniques is higher than the one obtained from enthalpy changes. The phenomenon is explained in terms of the superparamagnetic behavior of the uncoupled nanocrystals at the very early stages of nanocrystallization
Tamaño: 386.5Kb
Formato: PDF

URI: http://hdl.handle.net/11441/33385

DOI: http://dx.doi.org/10.1063/1.1849826

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