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American Physical Society, Physical review B, 6(80), 2009

DOI: 10.1103/physrevb.80.064421

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Stress-induced large Curie temperature enhancement in Fe64Ni36 Invar alloy

Journal article published in 2009 by Pedro Gorria, David Martínez-Blanco, Maria J. Perez, Jesús A. Blanco, Antonio Hernando, María A. Laguna-Marco, Daniel Haskel, Narcizo Souza-Neto, Ronald I. Smith, Ronald I. Smith, William G. Marshall, Gastón Garbarino, Mohamed Mezouar, Alejandro Fernández-Martínez, Jesús Chaboy and other authors.
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Abstract

6 pages ; International audience ; We have succeeded in increasing up to 150 K the Curie temperature in the Fe64Ni36 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.