Origin of room-temperature ferromagnetism in Co-doped CeO2

Kenji Tarui; Tomohiro Oomori; Yuya Ito; Tomoyuki Yamamoto

doi:10.1016/j.physb.2021.413158

Origin of room-temperature ferromagnetism in Co-doped CeO₂

Kenji Tarui, Tomohiro Oomori, Yuya Ito, Tomoyuki Yamamoto^*

^*Corresponding author for this work

School of Fundamental Science and Engineering

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

4 Citations (Scopus)

Abstract

Co-doped CeO₂ fabricated using the conventional solid-state reaction method demonstrates ferromagnetism at room temperature (RT). To investigate the origin of ferromagnetism at RT, powder X-ray diffraction analysis is first performed, in which pattern changes due to Co doping are not indicated. Subsequently, local environment analysis is carried out using X-ray absorption near-edge structure (XANES) measurements at the Co K-edge, demonstrating the metallic valence state of Co. Hence, it is confirmed that Co exists as nanosized small particles in CeO₂, which demonstrates ferromagnetism at RT.

Original language	English
Article number	413158
Journal	Physica B: Condensed Matter
Volume	619
DOIs	https://doi.org/10.1016/j.physb.2021.413158
Publication status	Published - 2021 Oct 15

Keywords

CeO
Co
Dilute magnetic material
X-ray absorption near-edge structure

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1016/j.physb.2021.413158

Cite this

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title = "Origin of room-temperature ferromagnetism in Co-doped CeO2",

abstract = "Co-doped CeO2 fabricated using the conventional solid-state reaction method demonstrates ferromagnetism at room temperature (RT). To investigate the origin of ferromagnetism at RT, powder X-ray diffraction analysis is first performed, in which pattern changes due to Co doping are not indicated. Subsequently, local environment analysis is carried out using X-ray absorption near-edge structure (XANES) measurements at the Co K-edge, demonstrating the metallic valence state of Co. Hence, it is confirmed that Co exists as nanosized small particles in CeO2, which demonstrates ferromagnetism at RT.",

keywords = "CeO, Co, Dilute magnetic material, X-ray absorption near-edge structure",

author = "Kenji Tarui and Tomohiro Oomori and Yuya Ito and Tomoyuki Yamamoto",

note = "Funding Information: The Co–K XANES measurements were conducted at BL01B1 in SPring-8 through the Japan Synchrotron Radiation Research Institute under Proposal 2016B1226. Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

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doi = "10.1016/j.physb.2021.413158",

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T1 - Origin of room-temperature ferromagnetism in Co-doped CeO2

AU - Tarui, Kenji

AU - Oomori, Tomohiro

AU - Ito, Yuya

AU - Yamamoto, Tomoyuki

N1 - Funding Information: The Co–K XANES measurements were conducted at BL01B1 in SPring-8 through the Japan Synchrotron Radiation Research Institute under Proposal 2016B1226. Publisher Copyright: © 2021 Elsevier B.V.

PY - 2021/10/15

Y1 - 2021/10/15

N2 - Co-doped CeO2 fabricated using the conventional solid-state reaction method demonstrates ferromagnetism at room temperature (RT). To investigate the origin of ferromagnetism at RT, powder X-ray diffraction analysis is first performed, in which pattern changes due to Co doping are not indicated. Subsequently, local environment analysis is carried out using X-ray absorption near-edge structure (XANES) measurements at the Co K-edge, demonstrating the metallic valence state of Co. Hence, it is confirmed that Co exists as nanosized small particles in CeO2, which demonstrates ferromagnetism at RT.

AB - Co-doped CeO2 fabricated using the conventional solid-state reaction method demonstrates ferromagnetism at room temperature (RT). To investigate the origin of ferromagnetism at RT, powder X-ray diffraction analysis is first performed, in which pattern changes due to Co doping are not indicated. Subsequently, local environment analysis is carried out using X-ray absorption near-edge structure (XANES) measurements at the Co K-edge, demonstrating the metallic valence state of Co. Hence, it is confirmed that Co exists as nanosized small particles in CeO2, which demonstrates ferromagnetism at RT.

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KW - X-ray absorption near-edge structure

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