Magnetic noises emitted during martensitic transformation in Ni 49 Fe 18 Ga 27 Co 6 single crystalline shape memory alloys

M. K. Bolgár, L. Daróczi, L. Z. Tóth, E. E. Timofeeva, E. Y. Panchenko, Y. I. Chumlyakov, D. L. Beke

Research output: Article

Abstract

Magnetic noises during martensitic transformations in single crystalline Ni 49 Fe 18 Ga 27 Co 6 (at. %) alloys were measured. The critical exponents of the acoustic and magnetic noises were slightly different from each other in contrast to those obtained in Ni 2 MnGa single crystals, measured so far. The presence of nano-sized γ-particles increased the noise activity and resulted in bipolar magnetic noise, in contrast to mostly unipolar signals observed in the homogeneous sample or in Ni 2 MnGa. Application of a moderate external magnetic field (20.9 mT) decreased the bipolar nature of the noise, which was qualitatively explained by the magnetoelastic coupling and by the more ordered magnetic domain structure. Nano-sized precipitates resulted in more fine steps of the jerky motion of the interface and caused barriers against of the easy development of the magnetic structure.

Original languageEnglish
Pages (from-to)103-107
Number of pages5
JournalIntermetallics
Volume107
DOIs
Publication statusPublished - ápr. 2019

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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