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

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dc.contributor.authorMaity, Tuhin
dc.contributor.authorGoswami, Sudipta
dc.contributor.authorBhattacharya, Dipten
dc.contributor.authorRoy, Saibal
dc.contributor.funderCouncil for Scientific and Industrial Research
dc.contributor.funderScience Foundation Ireland
dc.contributor.funderDublin City University
dc.date.accessioned2017-09-04T09:02:30Z
dc.date.available2017-09-04T09:02:30Z
dc.date.issued2013
dc.description.abstractWe 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.110.107201en
dc.description.sponsorshipDublin City University (Indo-Ireland joint program (DST/INT/IRE/P-15/11); Science Foundation Ireland (11/PI/1201), FORME SRC project 07/SRC/I1172)en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid107201
dc.identifier.citationMaity, 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.110.107201en
dc.identifier.doi10.1103/PhysRevLett.110.107201
dc.identifier.issn0031-9007
dc.identifier.issn1079-7114
dc.identifier.issued10
dc.identifier.journaltitlePhysical Review Lettersen
dc.identifier.urihttps://hdl.handle.net/10468/4619
dc.identifier.volume110
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.relation.urihttps://journals.aps.org/prl/abstract/10.1103/PhysRevLett.110.107201
dc.rights© 2013, American Physical Societyen
dc.subjectNanocompositeen
dc.subjectSpontaneous exchange biasen
dc.subjectTemperatureen
dc.titleSuperspin glass mediated giant spontaneous exchange bias in a nanocomposite of BiFeO3-Bi2Fe4O9en
dc.typeArticle (peer-reviewed)en
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