Exchange bias and training effect in an amorphous Zn-Fe-O/nanocrystalline GaFeO3 bilayer thin film

Himadri Roy Dakua

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

In this paper, I report the exchange bias effect in a bilayer thin film of amorphous Zn-Fe-O (ZFO) and nanocrystalline GaFeO3 (GFO). I deposited the amorphous ZFO layer on top of a nanocrystalline GFO thin film using pulsed laser ablation of a Zinc ferrite (ZnFe2O4) target at room temperature. This bilayer film showed a large exchange bias effect (HE ∼ 418 Oe at 2 K). The exchange bias shift decreased exponentially as the temperature increased and disappeared for T > 30 K. Along with the exchange bias shift, the film also showed enhanced magnetization in Field Cooled (FC) measurements as compared to the Zero Field Cooled (ZFC) magnetization. The magnetization decreased during consecutive M-H loops cycling in training effect measurements. This decrease in the magnetization of the film followed the spin configurational relaxation model. The observed exchange bias effect can be attributed to a unidirectional anisotropy originated due to the pinning effect of the interfacial spins of the ZFO layer.

Original languageEnglish
Article number111146
JournalMaterials Research Bulletin
Volume136
DOIs
StatePublished - 1 Apr 2021
Externally publishedYes

Keywords

  • Bilayer thin film
  • Exchange bias
  • Gallium ferrite
  • Pulsed laser deposition
  • Training effect

ASJC Scopus subject areas

  • Materials Science (all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint

Dive into the research topics of 'Exchange bias and training effect in an amorphous Zn-Fe-O/nanocrystalline GaFeO3 bilayer thin film'. Together they form a unique fingerprint.

Cite this