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

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dc.contributor.author Maity, Tuhin
dc.contributor.author Goswami, Sudipta
dc.contributor.author Bhattacharya, Dipten
dc.contributor.author Roy, Saibal
dc.date.accessioned 2017-09-04T09:02:30Z
dc.date.available 2017-09-04T09:02:30Z
dc.date.issued 2013
dc.identifier.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 en
dc.identifier.volume 110
dc.identifier.issued 10
dc.identifier.issn 0031-9007
dc.identifier.issn 1079-7114
dc.identifier.uri http://hdl.handle.net/10468/4619
dc.identifier.doi 10.1103/PhysRevLett.110.107201
dc.description.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 en
dc.description.sponsorship Dublin 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.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher American Physical Society en
dc.relation.uri https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.110.107201
dc.rights © 2013, American Physical Society en
dc.subject Nanocomposite en
dc.subject Spontaneous exchange bias en
dc.subject Temperature en
dc.title Superspin glass mediated giant spontaneous exchange bias in a nanocomposite of BiFeO3-Bi2Fe4O9 en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Roy Saibal, Tyndall National Institute, University College Cork, Cork, Ireland. +353-21-490-3000. Email: saibal.roy@tyndall.ie en
dc.internal.availability Full text available en
dc.description.version Published Version en
dc.internal.wokid WOS:000315744700019
dc.contributor.funder Council for Scientific and Industrial Research
dc.contributor.funder Science Foundation Ireland
dc.contributor.funder Dublin City University
dc.description.status Peer reviewed en
dc.identifier.journaltitle Physical Review Letters en
dc.internal.IRISemailaddress saibal.roy@tyndall.ie en
dc.identifier.articleid 107201


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