Superspin glass mediated giant spontaneous exchange bias in a nanocomposite of BiFeO3-Bi2Fe4O9

Maity, Tuhin; Goswami, Sudipta; Bhattacharya, Dipten; Roy, Saibal

Superspin glass mediated giant spontaneous exchange bias in a nanocomposite of BiFeO3-Bi2Fe4O9

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Supplementary file 1

Date

2013

Authors

Maity, Tuhin

Goswami, Sudipta

Bhattacharya, Dipten

Roy, Saibal

Publisher

American Physical Society

Published Version

10.1103/PhysRevLett.110.107201

Abstract

We observe an enormous spontaneous exchange bias (similar to 300-600 Oe)-measured in an unmagnetized state following zero-field cooling-in a nanocomposite of BiFeO3 (similar to 94%)-Bi2Fe4O9 (similar to 6%) over a temperature range 5-300 K. Depending on the path followed in tracing the hysteresis loop-positive (p) or negative (n)-as well as the maximum field applied, the exchange bias (H-E) varies significantly with vertical bar - H-Ep vertical bar > vertical bar H-En vertical bar. The temperature dependence of H-E is nonmonotonic. It increases, initially, till similar to 150 K and then decreases as the blocking temperature T-B is approached. All these rich features appear to be originating from the spontaneous symmetry breaking and consequent onset of unidirectional anisotropy driven by "superinteraction bias coupling'' between the ferromagnetic core of Bi2Fe4O9 (of average size similar to 19 nm) and the canted antiferromagnetic structure of BiFeO3 (of average size similar to 112 nm) via superspin glass moments at the shell. DOI: 10.1103/PhysRevLett.110.107201

Keywords

Nanocomposite , Spontaneous exchange bias , Temperature

Citation

Maity, T., Goswami, S., Bhattacharya, D. and Roy, S. (2013) ' Superspin glass mediated giant spontaneous exchange bias in a nanocomposite of BiFeO3-Bi2Fe4O9', Physical Review Letters, 110(10), 107201 (5pp). doi: 10.1103/PhysRevLett.110.107201