X-ray nanospectroscopic characterization of a molecularly thin ferromagnetic Ti1-x Cox O2 nanosheet

Yoshinori Kotani, Toshiyuki Taniuchi, Minoru Osada, Takayoshi Sasaki, Masato Kotsugi, F. Z. Guo, Yoshio Watanabe, Masato Kubota, Kanta Ono

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Abstract

We investigated the local electronic structures of a molecularly thin ferromagnetic Ti0.8 Co0.2 O2 nanosheet by means of x-ray nanospectroscopy with spectroscopic photoemission and low energy electron microscopy. By analyzing the Co 2p x-ray absorption and photoemission spectra, the chemical state of doped Co ions in individual Ti0.8 Co0.2 O2 nanosheet was found to be Co2+ low-spin state, which is consistent with previous magnetization data and first-principles calculation [M. Osada, Phys. Rev. B 73, 153301 (2006)]. Furthermore, we employed photoelectron emission microscopy to image the variation in chemical states in Ti0.8 Co0.2 O2 nanosheets with different stacking structures and clarified the identical Co2+ low-spin state in monolayer and overlapped cases.

Original languageEnglish
Article number093112
JournalApplied Physics Letters
Volume93
Issue number9
DOIs
Publication statusPublished - 2008
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Kotani, Y., Taniuchi, T., Osada, M., Sasaki, T., Kotsugi, M., Guo, F. Z., Watanabe, Y., Kubota, M., & Ono, K. (2008). X-ray nanospectroscopic characterization of a molecularly thin ferromagnetic Ti1-x Cox O2 nanosheet. Applied Physics Letters, 93(9), [093112]. https://doi.org/10.1063/1.2976550