Structural and magnetic phenomena in NIMNGA/substrate thin films composites

V. A. Chernenko, S. Besseghini, V. Recarte, R. Lopez Anton, A. Gambardella, J. M. Barandiaran, M. Ohtsuka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Transfomiation behavior, structural and magnetic phenomena in two thin film series of Ni50.3Mn21.8Ga21.4Fe 6.5/alumina (F1) and Ni51.4Mn28.3Ga 20.3/Mo (F2) composites are studied by means of X-rays, electrical resistivity, various magnetic and dynamical mechanical experiments. Thin films with thicknesses in the range of 0.1 - 5 μm have been deposited on substrates at 50 °C by r.f. magnetron sputtering and subsequently annealed at 800 °C for 1h. Each film in both series is 220-fiber textured. The results show that F2 films are martensitic at room temperature, while Fl films are in the austenite state. Contrary to F2 films, the Fl films demonstrate a considerable thickness dependence of the martensitic transformation temperature in the submicron range. In-plane and out-of-plane magnetic properties of films proved to be thickness-dependent not only in the martensitic state but also in austenite. Due to martensitic transformation, film composites demonstrate elastic anomalies in the dynamic bending or tensile temperature-dependent tests.

Original languageEnglish
Title of host publicationProceedings of the International Conference on Martensitic Transformations, ICOMAT-08
Pages459-464
Number of pages6
Publication statusPublished - 2009
Event12th International Conference on Martensitic Transformations, ICOMAT-08 - Santa Fe, NM, United States
Duration: 2008 Jun 292008 Jul 5

Publication series

NameProceedings of the International Conference on Martensitic Transformations, ICOMAT-08

Other

Other12th International Conference on Martensitic Transformations, ICOMAT-08
CountryUnited States
CitySanta Fe, NM
Period08/6/2908/7/5

Keywords

  • Ferromagnetic shape memory alloys
  • Magnetic structure
  • Martensitic transformation
  • Ni-Mn-Ga/substrate thin film composites

ASJC Scopus subject areas

  • Materials Chemistry

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