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Título:
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Direct measurements of the correlation between reentrant ferromagnetism and lattice expansion in FeCuZr alloys
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Autores:
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Martínez, A. ;
Spottorno Giner, Jorge ;
Figueroa, A. ;
Bartolome, F. ;
Garcia, L. M. ;
Prestipino, C. ;
Hernando Grande, Antonio ;
Crespo del Arco, Patricia
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Tipo de documento:
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texto impreso
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Editorial:
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American Physical Society, 2010-07-14
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Física de materiales
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Materia = Ciencias: Física: Física del estado sólido
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Tipo = Artículo
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Resumen:
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Amorphous metastable alloy of nominal composition [Fe_(0.5)Cu_(0.5)]_(87)Zr_(13) has been synthesized by high-energy ball milling. The alloy exhibit a ferromagnetic behavior with a Curie Temperature of T_(C)=255 K, as determined from low-field measurements whereas no transition to a paramagnetic state is observed under high- enough applied magnetic fields. The evolution of hysteresis loops with temperature as well as thermoremanence measurements indicate an anomalous magnetic behavior characterized by a spontaneous increase in the magnetization values as well as by a magnetic hardening when the temperature is increased above T_(C). These effects are strongly correlated with a dilation of the Fe-Fe nearest-neighbor distances, as determined from extended x-ray absorption fine structure (EXAFS) studies. EXAFS results indicate an almost negligible thermal expansion at temperatures below T_(C) while normal thermal expansion takes place at higher temperatures. Such expansion seems to promote a reinforcement of the ferromagnetic interactions among Fe-Fe atoms that would account for the observed spontaneous increase in the magnetization as well as for the evolution of the coercive field.
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En línea:
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https://eprints.ucm.es/41744/1/CrespoP%2005%20LIBRE.pdf
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