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dc.contributor.authorSANVITO, STEFANOen
dc.date.accessioned2013-07-11T08:34:48Z
dc.date.available2013-07-11T08:34:48Z
dc.date.issued2012en
dc.date.submitted2012en
dc.identifier.citationAaron Hurley, Nadjib Baadji, and Stefano Sanvito, Bias asymmetry in the conductance profile of magnetic ions on surfaces probed by scanning tunneling microscopy, Physical Review B, 86, 12, 2012, 125411-en
dc.identifier.otherYen
dc.identifier.urihttp://hdl.handle.net/2262/66699
dc.descriptionPUBLISHEDen
dc.description.abstractPHYSICAL REVIEW B 86 , 125411 (2012) Bias asymmetry in the conductance profile of magnetic ions on surfaces probed by scanning tunneling microscopy Aaron Hurley, Nadjib Baadji, and Stefano Sanvito School of Physics and CRANN, Trinity College, Dublin 2, Ireland (Received 29 March 2012; published 7 September 2012) The conductance profiles of magnetic transition-metal atoms, such as Fe, Co, and Mn, deposited on surfaces and probed by a scanning tunneling microscope (STM), provide detailed information on the magnetic excitations of such nanomagnets. In general, the profiles are symmetric with respect to the applied bias. However, a set of recent experiments has shown evidence for inherent asymmetries when either a normal or a spin-polarized STM tip is used. In order to explain such asymmetries, here we expand our previously developed perturbative approach to electron-spin scattering to the spin-polarized case and to the inclusion of out of equilibrium spin populations. In the case of a magnetic STM tip, we demonstrate that the asymmetries are driven by the nonequilibrium occupation of the various atomic spin levels, an effect that is reminiscent of electron spin transfer. In contrast, when the tip is not spin polarized, such a nonequilibrium population cannot be built up. In this circumstance, we propose that the asymmetry simply originates from the transition metal ion density of states and from the uneven electronic coupling between the scattering magnetic atoms and both the tip and the substrate. These effects are included in the formalism as a nonvanishing real component to the spin-scattering self-energyen
dc.description.sponsorshipThis work is sponsored by the Irish Research Council for Science, Engineering & Technology (IRCSET). N.B. and S.S. thank Science Foundation of Ireland (Grant No. 08/ERA/I1759) and CRANN for financial support. Computa- tional resources have been provided by the Trinity Centre for High Performance Computing (TCHPC). We wish to thank Cyrus Hirjibehedin for making the experimental data shown in Fig. 7 available to usen
dc.format.extent125411en
dc.language.isoenen
dc.relation.ispartofseriesPhysical Review Ben
dc.relation.ispartofseries86en
dc.relation.ispartofseries12en
dc.rightsYen
dc.subjectspin-scatteringen
dc.subject.lcshspin-scatteringen
dc.titleBias asymmetry in the conductance profile of magnetic ions on surfaces probed by scanning tunneling microscopyen
dc.typeJournal Articleen
dc.contributor.sponsorScience Foundation Ireland (SFI)en
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/sanvitosen
dc.identifier.rssinternalid84371en
dc.subject.TCDThemeNanoscience & Materialsen
dc.identifier.rssurihttp://link.aps.org/doi/10.1103/PhysRevB.86.125411en


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