Interfacial diffusion and exchange bias in the oxide multilayer Zn 0.7Ni 0.3Fe 2O 4/BiFeO 3/SrTiO 3

Wei Jui Lin, Xiaoding Qi

Research output: Contribution to journalArticlepeer-review

Abstract

The aim of this work is to fabricate an all-oxide spin valve using multiferroic BiFeO 3 as the antiferromagnetic pinning layer, in the hope that we may be able to switch magnetoresistance electrically. The proposed architecture is Zn 0.7Ni 0.3Fe 2O 4/ Sr 1-xLa xTiO 3/ Zn 0.7Ni 0.3Fe 2O 4/ BiFeO 3/ LaNiO 3/SrTiO 3. We have demonstrated that such a multilayer structure can be grown epitaxially by the RF magnetron sputtering. X-ray diffraction showed that the films were indeed biaxially aligned with reasonable in-plane and out-of-plane textures, under the growth conditions optimised for achieving good ferroelectric and magnetic properties. X-ray photoelectron spectroscopy depth profiling showed that there was significant Bi diffusion across the interface if the BiFeO 3 film was not stabilised in high oxygen ambience after deposition. High-resolution transmission electron microscopy showed a tidy and sharp Zn 0.7Ni 0.3Fe 2O 4/ BiFeO 3 boundary for the Zn 0.7Ni 0.3Fe 2O 4 films grown at 550 °C, while for the films grown at higher temperature an irregular interface was observed. Under the optimum growth condition, a clear exchange bias was achieved at the Zn 0.7Ni 0.3Fe 2O 4/ BiFeO 3 interface.

Original languageEnglish
Pages (from-to)1026-1029
Number of pages4
JournalSurface and Interface Analysis
Volume44
Issue number8
DOIs
Publication statusPublished - 2012 Aug

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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