Take a sneak peek at the new NIST.gov and let us know what you think!
(Please note: some content may not be complete on the beta site.).
NIST Authors in Bold
|Author(s):||S Apell; David R. Penn; P Johansson;|
|Title:||Circularly Polarized Light Emission in Scanning Tunneling Microscopy of Magnetic Systems|
|Published:||January 01, 2000|
|Abstract:||Light is produced when a scanning tunneling microscopy 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 ± 2%. We predict that the use of a silver tip would increase the degree of circular polarization for a range of photon energies.|
|Citation:||Physical Review B (Condensed Matter and Materials Physics)|
|Pages:||pp. 3534 - 3545|
|Keywords:||circularly polarized light,light emission,magnetic substrate,microscopy,scanning tunneling microscope|
|Research Areas:||Scanning tunneling spectroscopy (STS)|