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Local X-ray magnetic circular dichroism study of Fe/Cu(111) using a tunneling smart tip.

  • Author(s): DiLullo, Andrew;
  • Shirato, Nozomi;
  • Cummings, Marvin;
  • Kersell, Heath;
  • Chang, Hao;
  • Rosenmann, Daniel;
  • Miller, Dean;
  • Freeland, John W;
  • Hla, Saw-Wai;
  • Rose, Volker
  • et al.
Abstract

Localized spectroscopy with simultaneous topographic, elemental and magnetic information is presented. A synchrotron X-ray scanning tunneling microscope has been employed for the local study of the X-ray magnetic circular dichroism at the Fe L2,3-edges of a thin iron film grown on Cu(111). Polarization-dependent X-ray absorption spectra have been obtained through a tunneling smart tip that serves as a photoelectron detector. In contrast to conventional spin-polarized scanning tunneling microscopy, X-ray excitations provide magnetic contrast even with a non-magnetic tip. Intensity variations in the photoexcited tip current point to chemical variations within a single magnetic Fe domain.

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