title: Local X-ray magnetic circular dichroism study of Fe/Cu(111) using a tunneling smart tip.
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.
authors.affiliation: Center for Nanoscale Materials, Nanoscience and Technology Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.
authors.forename: Andrew
authors.initials: A
authors.lastname: DiLullo
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.
authors.forename: Nozomi
authors.initials: N
authors.lastname: Shirato
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.
authors.forename: Marvin
authors.initials: M
authors.lastname: Cummings
authors.affiliation: Center for Nanoscale Materials, Nanoscience and Technology Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.
authors.forename: Heath
authors.initials: H
authors.lastname: Kersell
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.
authors.forename: Hao
authors.initials: H
authors.lastname: Chang
authors.affiliation: Center for Nanoscale Materials, Nanoscience and Technology Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.
authors.forename: Daniel
authors.initials: D
authors.lastname: Rosenmann
authors.affiliation: Center for Nanoscale Materials, Nanoscience and Technology Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.
authors.forename: Dean
authors.initials: D
authors.lastname: Miller
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.
authors.forename: John W
authors.initials: JW
authors.lastname: Freeland
authors.affiliation: Center for Nanoscale Materials, Nanoscience and Technology Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.
authors.forename: Saw-Wai
authors.initials: SW
authors.lastname: Hla
authors.affiliation: Center for Nanoscale Materials, Nanoscience and Technology Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.
authors.forename: Volker
authors.initials: V
authors.lastname: Rose
keywords: XMCD; chemical contrast; smart tip; synchrotron X-ray scanning tunneling microscopy