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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

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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