Giant exchange bias in a nanocomposite of BiFeO3-Bi2Fe4O9

Details Giant exchange bias in a nanocomposite of BiFeO3-Bi2Fe4O9 Giant exchange bias in a nanocomposite of BiFeO3-Bi2Fe4O9

2012-02-27

arxiv.org/abs/1202.5898v1

Physics

Condensed Matter

Materials Science

5 pages with 5 figures

Scientific paper

We report our observation of an enormous spontaneous exchange bias (~40-60 mT) over a wide temperature range 5-300 K in a nanocomposite of BiFeO3 (~94%)-Bi2Fe4O9 (~6%). It originates from the exchange coupling interaction between frozen superspin glass moments in Bi2Fe4O9 (of average size ~19 nm) and antiferromagnetism in BiFeO3 (of average size ~112 nm) across the interfaces and its magnitude decreases with either increase or decrease in the volume fraction of Bi2Fe4O9. The spin structure at the interface exhibits an interesting rearrangement dynamics under a magnetic training operation. This large exchange bias can be exploited for yielding a colossal "exchange bias mediated multiferroic coupling" between ferroelectricity in BiFeO3 and magnetization in Bi2Fe4O9 within such a nanocomposite.

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