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

doi:10.1063/1.2976550

X-ray nanospectroscopic characterization of a molecularly thin ferromagnetic Ti_1-x Cox O₂ nanosheet

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

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 language	English
Article number	093112
Journal	Applied Physics Letters
Volume	93
Issue number	9
DOIs	https://doi.org/10.1063/1.2976550
Publication status	Published - 2008
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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X-ray nanospectroscopic characterization of a molecularly thin ferromagnetic Ti_1-x Cox O₂ nanosheet. / Kotani, Yoshinori; Taniuchi, Toshiyuki; Osada, Minoru; Sasaki, Takayoshi; Kotsugi, Masato; Guo, F. Z.; Watanabe, Yoshio; Kubota, Masato; Ono, Kanta.

In: Applied Physics Letters, Vol. 93, No. 9, 093112, 2008.

Research output: Contribution to journal › Article › peer-review

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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.",

author = "Yoshinori Kotani and Toshiyuki Taniuchi and Minoru Osada and Takayoshi Sasaki and Masato Kotsugi and Guo, {F. Z.} and Yoshio Watanabe and Masato Kubota and Kanta Ono",

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AU - Kotani, Yoshinori

AU - Taniuchi, Toshiyuki

AU - Osada, Minoru

AU - Sasaki, Takayoshi

AU - Kotsugi, Masato

AU - Guo, F. Z.

AU - Watanabe, Yoshio

AU - Kubota, Masato

AU - Ono, Kanta

PY - 2008

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N2 - 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.

AB - 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.

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X-ray nanospectroscopic characterization of a molecularly thin ferromagnetic Ti_1-x Cox O₂ nanosheet

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