Origin of the asymmetric exchange bias in BiFeO3/Bi2Fe4O9 nanocomposite

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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 2017-10-18T11:40:54Z
dc.date.available 2017-10-18T11:40:54Z
dc.date.issued 2014-04-24
dc.identifier.citation Maity, T., Goswami, S., Bhattacharya, D. and Roy, S. (2014) 'Origin of the asymmetric exchange bias in BiFeO3/Bi2Fe4O9 nanocomposite', Physical Review B, 89(14), 140411 (5pp). doi:10.1103/PhysRevB.89.140411 en
dc.identifier.volume 89 en
dc.identifier.issued 14
dc.identifier.startpage 1 en
dc.identifier.endpage 5 en
dc.identifier.issn 2469-9950
dc.identifier.uri http://hdl.handle.net/10468/4908
dc.identifier.doi 10.1103/PhysRevB.89.140411
dc.description.abstract We show from detailed magnetometry across 2-300 K that the BiFeO3-Bi2Fe4O9 nanocomposite offers a unique spin morphology where superspin glass (SSG) and dilute antiferromagnet in a field (DAFF) coexist at the interface between ferromagnetic Bi2Fe4O9 and antiferromagnetic BiFeO3. The coexisting SSG and DAFF combine to form a local spin texture, which gives rise to a path- dependent exchange bias below the spin freezing temperature (similar to 29 K). The exchange bias varies depending on the protocol or path followed in tracing the hysteresis loop. The exchange bias has been observed below the blocking temperature (T-B) 60 K of the superparamagnetic Bi2Fe4O9. The conventional exchange bias (CEB) increases nonmonotonically as temperature decreases. The magnitude of both exchange bias (H-E) and coercivity (H-C) increase with decrease in temperature and are found to be asymmetric below 20 K depending on the path followed in tracing the hysteresis loop and bias field. The local spin texture at the interface between ferromagnetic and antiferromagnetic particles generates a nonswitchable unidirectional anisotropy along the negative direction of the applied field. The influence of this texture also shows up in " asymmetric" jumps in the hysteresis loop at 2 K, which smears off at higher temperature. The role of the interface spin texture in yielding the path dependency of exchange bias is thus clearly delineated. en
dc.description.sponsorship Department of Science and Technology, Ministry of Science and Technology (Indo-Ireland joint program of the Department of Science and Technology, Government of India DST/INT/IRE/P-15/11) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher American Physical Society en
dc.rights © 2014, American Physical Society. All rights reserved. en
dc.subject Anisotropy en
dc.subject Bilayers en
dc.title Origin of the asymmetric exchange bias in BiFeO3/Bi2Fe4O9 nanocomposite en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Saibal Roy, Tyndall Microsystems, University College Cork, Cork, Ireland. +353-21-490-3000 Email: saibal.roy@tyndall.ie en
dc.internal.availability Full text available en
dc.date.updated 2017-10-13T12:21:05Z
dc.description.version Published Version en
dc.internal.rssid 271354819
dc.internal.wokid 000335498500001
dc.contributor.funder Science Foundation Ireland en
dc.contributor.funder Department of Science and Technology, Ministry of Science and Technology en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Physical Review B en
dc.internal.copyrightchecked Yes en
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress saibal.roy@tyndall.ie en
dc.relation.project info:eu-repo/grantAgreement/SFI/SFI International Strategic Cooperation Award (ISCA)/12/ISCA/2493/IE/Ireland-India ISCA Programme/ en
dc.relation.project info:eu-repo/grantAgreement/SFI/SFI Principal Investigator Programme (PI)/11/PI/1201/IE/Vibration based wideband electromagnetic micropower generators on silicon: MEMS to NEMS/ en


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