Circularly polarized light emission in scanning tunneling microscopy of magnetic systems

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dc.creatorApell, S. P.
dc.creatorPenn, D. R.
dc.creatorJohansson, P.
dc.date2000-01-05
dc.date.accessioned2026-07-07T02:36:26Z
dc.date.available2026-07-07T02:36:26Z
dc.descriptionLight is produced when a scanning tunneling microscope is used to probe a metal surface. Recent experiments on cobalt utilizing a tungsten tip found that the light is circularly polarized; the sense of circular polarization depends on the direction of the sample magnetization, and the degree of polarization is of order 10 %. This raises the possibility of constructing a magnetic microscope with very good spatial resolution. We present a theory of this effect for iron and cobalt and find a degree of polarization of order 0.1 %. This is in disagreement with the experiments on cobalt as well as previous theoretical work which found order of magnitude agreement with the experimental results. However, a recent experiment on iron showed 0.0 ${\pm}$2 %. We predict that the use of a silver tip would increase the degree of circular polarization for a range of photon energies.
dc.description15 pages, 4 figures, (To appear in Phys. Rev. B, February 2000)
dc.identifierhttps://arxiv.org/abs/cond-mat/0001044
dc.identifierhttp://arxiv.org/abs/cond-mat/0001044
dc.identifierPhys. Rev. B 61, 3534 (2000).
dc.identifierdoi:10.1103/PhysRevB.61.3534
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/15916
dc.subjectCondensed Matter
dc.titleCircularly polarized light emission in scanning tunneling microscopy of magnetic systems
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