Spontaneous formation of suboxidic coordination around Co in ferromagnetic rutile Ti0.95Co0.5O2 film

Hu, Wen; Hayaski, Kouichi; Fukumura, Tomoteru; Akagi, Kazuto; Tsukada, Masaru; Happo, Naohisa; Hosokawa, Shinya; Ohwada, Kenji; Takahasi, Masamitu; Suzuki, Motohiro; Kawasaki, Masashi

doi:10.1063/1.4921847

Title: Spontaneous formation of suboxidic coordination around Co in ferromagnetic rutile Ti_0.95Co_0.5O₂ film

Journal Article · Tue Jun 02 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4921847· OSTI ID:1237178

Hu, Wen ^[1]; Hayaski, Kouichi ^[2]; Fukumura, Tomoteru ^[3]; Akagi, Kazuto ^[2]; Tsukada, Masaru ^[2]; Happo, Naohisa ^[4]; Hosokawa, Shinya ^[5]; Ohwada, Kenji ^[6]; Takahasi, Masamitu ^[6]; Suzuki, Motohiro ^[7]; Kawasaki, Masashi ^[3]

Brookhaven National Lab. (BNL), Upton, NY (United States)
Tohoku Univ., Sendai (Japan)
The Univ. of Tokyo, Tokyo (Japan)
Hiroshima City Univ., Hiroshima (Japan)
Kumamoto Univ., Kumamoto (Japan)
Japan Atomic Energy Agency, Hyogo (Japan)
JASRI/SPring-8, Hyogo (Japan)

To evaluate local atomic structures around Co in high temperature diluted ferromagnetic semiconductor Co-doped TiO₂, x-ray fluorescence holography and x-ray absorption fine structure experiments were carried out on rutile paramagnetic Ti_0.99Co_0.01O₂ and ferromagnetic Ti_0.95Co_0.05O₂ films. The Co atoms in the Ti_0.99Co_0.01O₂ simply substituted for Ti sites in the rutile structure, whereas a suboxidic arrangement of CoO₂Ti₄ formed around Co in the Ti_0.95Co_0.05O₂ films. A theoretical investigation based on a series of first-principles calculations indicated the stability of the aggregated suboxidic clusters in the rutile TiO₂, supporting our hypothesis for the formation of suboxidic coordination in the highly Co-doped sample. As a result, the suboxidic coordination may be the source of strong exchange interaction, resulting in the high Curie temperature in Co-doped TiO₂.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC00112704

OSTI ID:: 1237178

Report Number(s):: BNL-108462-2015-JA; APPLAB

Journal Information:: Applied Physics Letters, Vol. 106, Issue 22; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 36 works

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Algorithm for Atomic Resolution Holography Using Modified L ₁ -Regularized Linear Regression and Steepest Descent Method Matsushita, Tomohiro physica status solidi (b), Vol. 255, Issue 11 https://doi.org/10.1002/pssb.201800091	journal	July 2018
Investigation of local structural environments and room-temperature ferromagnetism in (Fe,Cu)-codoped In ₂ O ₃ diluted magnetic oxide films An, Yukai; Xing, Yaya; Pan, Fei Physical Chemistry Chemical Physics, Vol. 18, Issue 19 https://doi.org/10.1039/c6cp01315e	journal	January 2016
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Title: Spontaneous formation of suboxidic coordination around Co in ferromagnetic rutile Ti0.95Co0.5O2 film

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Title: Spontaneous formation of suboxidic coordination around Co in ferromagnetic rutile Ti_0.95Co_0.5O₂ film