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Direct measurements of the correlation between reentrant ferromagnetism and lattice expansion in FeCuZr alloys

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Martinez, A. y Spottorno Giner, Jorge y Figueroa, A. y Bartolome, F. y Garcia, L. M. y Prestipino, C. y Hernando, A. y Crespo del Arco, Patricia (2010) Direct measurements of the correlation between reentrant ferromagnetism and lattice expansion in FeCuZr alloys. Physical review B, 82 (1). ISSN 1098-0121

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URL Oficial: http://dx.doi.org/10.1103/PhysRevB.82.012406


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Resumen

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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©2010 The American Physical Society.
This work was supported by Spanish MICINN under Projects No. MAT2009-14741-C02-01 and No. MAT2008- 01077, and Consolider-Ingenio in Molecular Nanoscience under Project No. CSD2007- 00010; and DGA by means of IMANA and CAMRADS. A.I.F acknowledges a CSIC-JAE Predoc grant.

Palabras clave:Semiconductors; Ferromagnetism; Nanoparticles
Materias:Ciencias > Física > Física de materiales
Ciencias > Física > Física del estado sólido
Código ID:41744
Depositado:10 Mar 2017 15:48
Última Modificación:10 Mar 2017 15:48

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