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dc.contributor.authorBean, Jonathan
dc.contributor.authorMcKenna, Keith
dc.date.accessioned2018-12-20T00:30:34Z
dc.date.available2018-12-20T00:30:34Z
dc.date.issued2018-12-01
dc.identifier.issn2476-0455
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/287214
dc.description.abstractMagnetic tunnel junctions employing FeCoB as the ferromagnet and MgO as a spacer layer exhibit high performance and are attractive for magnetic random access memory applications. On post-deposition annealing B is observed to diffuse out of the FeCoB layers inducing crystallization of FeCo. It is known that a large proportion of B escapes into the adjacent tantalum underlayer. While diffusion of B into bulk MgO is known to be unfavorable it is possible that B could diffuse into grain boundaries (GBs) in the polycrystalline MgO layer, affecting its electronic properties. In this paper density functional theory is used to investigate the stability and electronic properties of oxygen vacancy and B interstitial defects at MgO GBs. We show that both types of defects exhibit increased stability at the GBs and introduce electronic states in the gap that could negatively impact performance. These predictions are consistent with recent experimental results and we discuss further means to confirm the results experimentally using techniques such as x-ray or ultra-violet photoelectron spectroscopy.
dc.publisherAmerican Physical Society (APS)
dc.titleStability of point defects near MgO grain boundaries in FeCoB/MgO/FeCoB magnetic tunnel junctions
dc.typeArticle
prism.number125002
prism.publicationNamePhysical Review Materials
prism.volume2
dc.identifier.doi10.17863/CAM.34521
dcterms.dateAccepted2018-11-19
rioxxterms.versionofrecord10.1103/PhysRevMaterials.2.125002
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2018-11-19
dc.contributor.orcidBean, Jonathan [0000-0003-0493-7768]
dc.identifier.eissn2475-9953
dc.publisher.urlhttps://journals.aps.org/prmaterials/abstract/10.1103/PhysRevMaterials.2.125002
rioxxterms.typeJournal Article/Review
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/P020259/1)
cam.issuedOnline2018-12-14
dc.identifier.urlhttps://journals.aps.org/prmaterials/abstract/10.1103/PhysRevMaterials.2.125002
datacite.issupplementedby.urlhttps://doi.org/10.17863/CAM.33542


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