Nanoscale chemical imaging by scanning tunneling microscopy assisted by synchrotron radiation

Taichi Okuda, Toyoaki Eguchi, Kotone Akiyama, Ayumi Harasawa, Toyohiko Kinoshita, Yukio Hasegawa, Masanori Kawamori, Yuichi Haruyama, Shinji Matsui

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Nanoscale chemical imaging using scanning tunneling microscopy is demonstrated with a core-level excitation of the probed element by a synchrotron radiation light. Pronounced element-specific contrasts were observed in the spatial resolution of ∼10nm on checkerboard-patterned Ni and Fe samples in differential photoinduced current images taken with the scanning tunneling microscopy tip under the synchrotron radiation irradiation whose photon energies are above and below the Ni (Fe) L absorption edge. The local detection of the photoinduced secondary electrons through the surface barrier lowered by the proximate tip and/or via the tunneling process probably plays an important role in achieving the high-spatial resolution.

Original languageEnglish
Article number105503
JournalPhysical Review Letters
Volume102
Issue number10
DOIs
Publication statusPublished - 2009 Mar 9
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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