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dc.contributor.authorFOWLEY, CIARAN
dc.contributor.authorCOEY, JOHN MICHAEL DAVID
dc.date.accessioned2009-08-12T10:06:56Z
dc.date.available2009-08-12T10:06:56Z
dc.date.issued2009
dc.date.submitted2009en
dc.identifier.citationC. Fowley, BS Chun, JMD Coey 'Negative magnetoresistance in dual spin valve structures with a synthetic antiferromagnetic free layer' in IEEE Transactions on Magnetics, 45, (6), 2009, pp 2403-2406en
dc.identifier.issnhttp://dx.doi.org/10.1109/TMAG.2009.2018589
dc.identifier.otherYen
dc.identifier.otherY
dc.identifier.urihttp://hdl.handle.net/2262/31669
dc.descriptionPUBLISHEDen
dc.description.abstractGiant magnetoresistance (GMR) in spin valves is due to spin-dependent scattering occurring at ferromagnet/normal metal (F/N) interfaces and/or in the ferromagnetic layers. In a spin valve with a typical F/N/F structure where the spin scattering asymmetry factor (alpha) of both F/N interfaces is the same (more or less than 1), the GMR is expected to be positive. If alpha is greater than one at one F/N interface and less than one at the other F/N interface, however, the GMR is expected to be negative. Here, we show that the F1/Cu/SAF/Cu/F2/IrMn dual spin valve structure exhibits negative GMR, where F1 and F2 are CoFe and SAF = CoFe/Ru t/CoFe, due to both opposite electron spin scattering asymmetry factor at the CoFe/Ru/CoFe interfaces as well as the electrical separation of the overall structure into two GMR spin valves connected in parallel. A GMR of 6% is observed in the structure without the Ru spacer layer, insertion of a 0.6 nm thick Ru in the SAF results in a negative GMR ratio of -3% , which becomes positive again at the Ru thickness of 0.8 nm, the oscillation from positive to negative MR is consistent with interlayer exchange coupling period across the Ru spacer.en
dc.description.sponsorshipC. Fowley would like to thank Dr. M. Venkatesan for help acquiring the SQUID data. This work was supported by the Science Foundation Ireland as part of the MANSE program.en
dc.format.extent2403-2406en
dc.format.extent334891 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.publisherIEEEen
dc.relation.ispartofseriesIEEE Transactions on Magneticsen
dc.relation.ispartofseries45en
dc.relation.ispartofseries6en
dc.rightsYen
dc.subjectDual spin valve, negative GMR, synthetic antiferromagnet.en
dc.titleNegative magnetoresistance in dual spin valve structures with a synthetic antiferromagnetic free layeren
dc.typeJournal Articleen
dc.contributor.sponsorScience Foundation Ireland
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/jcoey


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