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Stress-induced large Curie temperature enhancement in Fe64Ni36 Invar alloy

Abstract : 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.
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Submitted on : Friday, March 11, 2022 - 11:01:19 AM
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Pedro Gorria, David Martínez-Blanco, Maria J. Perez, Jesús A. Blanco, Antonio Hernando, et al.. Stress-induced large Curie temperature enhancement in Fe64Ni36 Invar alloy. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2009, 80 (6), pp.064421. ⟨10.1103/PhysRevB.80.064421⟩. ⟨insu-00498748⟩

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