Magneto-optical spectroscopy of anatase TiO2 doped with Co

Tomoteru Fukumura; Yasuhiro Yamada; Kentaro Tamura; Kiyomi Nakajima; Toyomi Aoyama; Atsushi Tsukazaki; Masatomo Sumiya; Shunro Fuke; Yusaburo Segawa; Toyohiro Chikyow; Tetsuya Hasegawa; Hideomi Koinuma; Masashi Kawasaki

doi:10.1143/JJAP.42.L105

Magneto-optical spectroscopy of anatase TiO₂ doped with Co

Tomoteru Fukumura, Yasuhiro Yamada, Kentaro Tamura, Kiyomi Nakajima, Toyomi Aoyama, Atsushi Tsukazaki, Masatomo Sumiya, Shunro Fuke, Yusaburo Segawa, Toyohiro Chikyow, Tetsuya Hasegawa, Hideomi Koinuma, Masashi Kawasaki

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

60 Citations (Scopus)

Abstract

Magneto-optical spectroscopy of a transparent ferromagnetic semiconductor, anatase TiO₂ doped with Co, is carried out at room temperature. A large magneto-optical response with ferromagnetic field dependence is observed throughout from ultraviolet to visible range and increases with increasing Co content or carrier concentration. The magnitude of magnetic circular dichroism (MCD) per unit thickness has a peak around the absorption edge such a huge value of ∼10400 deg/cm at 3.57 eV for a 10 mol% Co-doped specimen. Although the results are not sufficient to prove that the ferromagnetism is in the ordinary framework of diluted magnetic semiconductors, the coexistence of Co impurity and mobile carrier is shown to transform the band structure of host TiO₂ to generate ferromagnetism.

Original language	English
Pages (from-to)	L105-L107
Journal	Japanese Journal of Applied Physics
Volume	42
Issue number	2 A
DOIs	https://doi.org/10.1143/JJAP.42.L105
Publication status	Published - 2003 Feb 1

Keywords

Anatase TiO
Co
Ferromagnetism
Laser molecular beam epitaxy
Magnetic semiconductor
Magneto-optical effect
Oxide
Thin film

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10.1143/JJAP.42.L105

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title = "Magneto-optical spectroscopy of anatase TiO2 doped with Co",

abstract = "Magneto-optical spectroscopy of a transparent ferromagnetic semiconductor, anatase TiO2 doped with Co, is carried out at room temperature. A large magneto-optical response with ferromagnetic field dependence is observed throughout from ultraviolet to visible range and increases with increasing Co content or carrier concentration. The magnitude of magnetic circular dichroism (MCD) per unit thickness has a peak around the absorption edge such a huge value of ∼10400 deg/cm at 3.57 eV for a 10 mol% Co-doped specimen. Although the results are not sufficient to prove that the ferromagnetism is in the ordinary framework of diluted magnetic semiconductors, the coexistence of Co impurity and mobile carrier is shown to transform the band structure of host TiO2 to generate ferromagnetism.",

keywords = "Anatase TiO, Co, Ferromagnetism, Laser molecular beam epitaxy, Magnetic semiconductor, Magneto-optical effect, Oxide, Thin film",

author = "Tomoteru Fukumura and Yasuhiro Yamada and Kentaro Tamura and Kiyomi Nakajima and Toyomi Aoyama and Atsushi Tsukazaki and Masatomo Sumiya and Shunro Fuke and Yusaburo Segawa and Toyohiro Chikyow and Tetsuya Hasegawa and Hideomi Koinuma and Masashi Kawasaki",

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doi = "10.1143/JJAP.42.L105",

language = "English",

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T1 - Magneto-optical spectroscopy of anatase TiO2 doped with Co

AU - Fukumura, Tomoteru

AU - Yamada, Yasuhiro

AU - Tamura, Kentaro

AU - Nakajima, Kiyomi

AU - Aoyama, Toyomi

AU - Tsukazaki, Atsushi

AU - Sumiya, Masatomo

AU - Fuke, Shunro

AU - Segawa, Yusaburo

AU - Chikyow, Toyohiro

AU - Hasegawa, Tetsuya

AU - Koinuma, Hideomi

AU - Kawasaki, Masashi

PY - 2003/2/1

Y1 - 2003/2/1

N2 - Magneto-optical spectroscopy of a transparent ferromagnetic semiconductor, anatase TiO2 doped with Co, is carried out at room temperature. A large magneto-optical response with ferromagnetic field dependence is observed throughout from ultraviolet to visible range and increases with increasing Co content or carrier concentration. The magnitude of magnetic circular dichroism (MCD) per unit thickness has a peak around the absorption edge such a huge value of ∼10400 deg/cm at 3.57 eV for a 10 mol% Co-doped specimen. Although the results are not sufficient to prove that the ferromagnetism is in the ordinary framework of diluted magnetic semiconductors, the coexistence of Co impurity and mobile carrier is shown to transform the band structure of host TiO2 to generate ferromagnetism.

AB - Magneto-optical spectroscopy of a transparent ferromagnetic semiconductor, anatase TiO2 doped with Co, is carried out at room temperature. A large magneto-optical response with ferromagnetic field dependence is observed throughout from ultraviolet to visible range and increases with increasing Co content or carrier concentration. The magnitude of magnetic circular dichroism (MCD) per unit thickness has a peak around the absorption edge such a huge value of ∼10400 deg/cm at 3.57 eV for a 10 mol% Co-doped specimen. Although the results are not sufficient to prove that the ferromagnetism is in the ordinary framework of diluted magnetic semiconductors, the coexistence of Co impurity and mobile carrier is shown to transform the band structure of host TiO2 to generate ferromagnetism.

KW - Anatase TiO

KW - Co

KW - Ferromagnetism

KW - Laser molecular beam epitaxy

KW - Magnetic semiconductor

KW - Magneto-optical effect

KW - Oxide

KW - Thin film

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U2 - 10.1143/JJAP.42.L105

DO - 10.1143/JJAP.42.L105

M3 - Letter

AN - SCOPUS:0037320582

SN - 0021-4922

VL - 42

SP - L105-L107

JO - Japanese Journal of Applied Physics

JF - Japanese Journal of Applied Physics

IS - 2 A

ER -

Magneto-optical spectroscopy of anatase TiO₂ doped with Co

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Keywords

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