Exchange bias effect in partially oxidized amorphous Fe-Ni-B based metallic glass nanostructures

S. Thomas, G. Pookat, S. S. Nair, M. Daniel, B. Dymerska, A. Liebig, S. H. Al-Harthi, R. V. Ramanujan, M. R. Anantharaman, J. Fidler, M. Albrecht

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Abstract

The magnetic properties of amorphous FeNiB based metallic glass nanostructures were investigated. The nanostructures underwent a spin-glass transition at temperatures below 100K and revealed an irreversible temperature following the linear de AlmeidaThouless dependence. When the nanostructures were cooled below 25K in a magnetic field, they exhibited an exchange bias effect with enhanced coercivity. The observed onset of exchange bias is associated with the coexistence of the spin-glass phase along with the appearance of another spin-glass phase formed by oxidation of the structurally disordered surface layer, displaying a distinct training effect and cooling field dependence. The latter showed a maximum in exchange bias field and coercivity, which is probably due to competing multiple equivalent spin configurations at the boundary between the two spin-glass phases.

Original languageEnglish
Article number256004
JournalJournal of Physics: Condensed Matter
Volume24
Issue number25
DOIs
Publication statusPublished - Jun 27 2012

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Science(all)

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    Thomas, S., Pookat, G., Nair, S. S., Daniel, M., Dymerska, B., Liebig, A., Al-Harthi, S. H., Ramanujan, R. V., Anantharaman, M. R., Fidler, J., & Albrecht, M. (2012). Exchange bias effect in partially oxidized amorphous Fe-Ni-B based metallic glass nanostructures. Journal of Physics: Condensed Matter, 24(25), [256004]. https://doi.org/10.1088/0953-8984/24/25/256004