Temperature dependence of exchange biased multiferroic BiFeO3/Ni81Fe19 polycrystalline bilayer

J. Richy, T. Hauguel, J. Ph Jay, S. P. Pogossian, B. Warot-Fonrose, C. J. Sheppard, J. L. Snyman, A. M. Strydom, J. Ben Youssef, A. R.E. Prinsloo, D. Spenato, D. T. Dekadjevi

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The temperature dependence of exchange bias properties are studied in polycrystalline bilayers, for different thicknesses. Using a field cooling protocol, a non-monotonic behavior of the exchange bias field is shown in the exchange-biased bilayers. Another thermal protocol, the Soeya protocol, related to the thermal activation energies was carried out and reveals a two-step evolution of the exchange bias field. The results of these two different protocols are similar to the ones obtained for measurements previously reported on epitaxial , indicating a driving mechanism independent of the long-range crystalline arrangement (i.e. epitaxial or polycrystalline). An intrinsic property of is proposed as being the driving mechanism for the thermal dependent magnetization reversal: the canting of the spins leading to a biquadratic contribution to the exchange coupling. The temperature dependence of the magnetization reversal angular behavior agrees with the presence of such a biquadratic contribution for exchange biased bilayers studied here.

Original languageEnglish
Article number125308
JournalJournal Physics D: Applied Physics
Issue number12
Publication statusPublished - 6 Mar 2018


  • BiFeO
  • angular
  • exchange bias
  • polycrystalline
  • temperature dependence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films


Dive into the research topics of 'Temperature dependence of exchange biased multiferroic BiFeO3/Ni81Fe19 polycrystalline bilayer'. Together they form a unique fingerprint.

Cite this