Stress-induced large Curie temperature enhancement in Fe_(64)Ni_(36) Invar alloy
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2009
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American Physical Society
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Abstract
We have succeeded in increasing up to 150 K the Curie temperature in the Fe_(64)Ni_(36) invar alloy by means of a severe mechanical treatment followed by a heating up to 1073 K. The invar behavior is still present as revealed by the combination of magnetic measurements with neutron and x-ray techniques under extreme conditions, such as high temperature and high pressure. The proposed explanation is based in a selective induced microstrain around the Fe atoms, which causes a slight increase in the Fe-Fe interatomic distances, thus reinforcing ferromagnetic interactions due to the strong magnetoelastic coupling in these invar compounds.
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©2009 The American Physical Society.
We thank ISIS, Lujan Neutron Scattering Center at LANSCE, APS and ESRF for the allocation of neutron and synchrotron beam time, and the SCT at the University of Oviedo for the high-resolution XRD facility. This work was partially supported by FEDER and the Spanish MICINN (Grant No. MAT2008-06542-C04). M.A.L-M acknowledges MICINN for Postdoctoral grant. Work at Argonne & Los Alamos National Laboratories was supported by the U.S. Department of Energy, Office of Science, under Contracts No. DE-AC02- 06CH11357 and No. DE-AC52-06NA25396, respectively.
Articulo firmado por más de diez autores.