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Spontaneous exchange bias in a nanocomposite of BiFeO$_3$-Bi$_2$Fe$_4$O$_9$

Authors
  • Maity, Tuhin
  • Goswami, Sudipta
  • Bhattacharya, Dipten
  • Das, Gopes C.
  • Roy, Saibal
Type
Published Article
Publication Date
Apr 08, 2013
Submission Date
Apr 08, 2013
Identifiers
DOI: 10.1063/1.4796149
Source
arXiv
License
Yellow
External links

Abstract

We have observed a large as well as path-dependent spontaneous exchange bias (H$_{SEB}$) ($\sim$30-60 mT) in a nanocomposite of BiFeO$_3$-Bi$_2$Fe$_4$O$_9$ across 5-300 K when it is measured in an unmagnetized state following zero-field cooling and appropriate demagnetization. The path dependency yields a variation in the exchange bias depending on the sign of the starting field and the path followed in tracing the hysteresis loop. The asymmetry thus observed - $\Delta$H$_{SEB}$ - is found to be decreasing nonmonotonically across 5-300 K with a peak around 200 K. The $\Delta$H$_{SEB}$ together with large H$_{SEB}$ could have significant ramification in tuning the exchange bias driven effects and consequent applications.

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