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High-temperature evolution of coercivity in nanocrystalline alloys.


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Opened Access High-temperature evolution of coercivity in nanocrystalline alloys.

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Author: Franco García, Victorino
Kiss, László Ferenc
Kemény, T.
Vincze, imre
Conde Amiano, Clara Francisca
Conde Amiano, Alejandro
Department: Universidad de Sevilla. Departamento de Física de la Materia Condensada
Date: 2002
Published in: Physical Review B, 66 (22), 2244181- 2244188
Document type: Article
Abstract: The temperature evolution of the coercivity of a Finemet-type alloy, in which 10 at. % Fe has been substi- tuted by Cr and annealed at different temperatures, has been studied. In the temperature region above the coercivity maximum, the experimental hysteresis loops have been successfully fitted by a combination of two models which use effective field controlled memory effects and temperature rescaling to describe dipolarly interacting superparamagnetic particles. It is shown that the characteristic parameters of these two models ~ interaction temperature and interaction field ! are interrelated. A consistent two-step fitting procedure was developed which yielded physically meaningful values for the temperature dependence of the magnetic mo- ment of the particles.
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