Origin of the asymmetric exchange bias in BiFeO3/Bi2Fe4O9 nanocomposite

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dc.contributor.authorMaity, Tuhin
dc.contributor.authorGoswami, Sudipta
dc.contributor.authorBhattacharya, Dipten
dc.contributor.authorRoy, Saibal
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderDepartment of Science and Technology, Ministry of Science and Technologyen
dc.date.accessioned2017-10-18T11:40:54Z
dc.date.available2017-10-18T11:40:54Z
dc.date.issued2014-04-24
dc.date.updated2017-10-13T12:21:05Z
dc.description.abstractWe 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.sponsorshipDepartment 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.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationMaity, 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.89.140411en
dc.identifier.doi10.1103/PhysRevB.89.140411
dc.identifier.endpage5en
dc.identifier.issn2469-9950
dc.identifier.issued14
dc.identifier.journaltitlePhysical Review Ben
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/4908
dc.identifier.volume89en
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI International Strategic Cooperation Award (ISCA)/12/ISCA/2493/IE/Ireland-India ISCA Programme/en
dc.relation.projectinfo: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
dc.rights© 2014, American Physical Society. All rights reserved.en
dc.subjectAnisotropyen
dc.subjectBilayersen
dc.titleOrigin of the asymmetric exchange bias in BiFeO3/Bi2Fe4O9 nanocompositeen
dc.typeArticle (peer-reviewed)en
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