Cobalt valence states and origins of ferromagnetism in Co doped TiO 2 rutile thin films

Makoto Murakami; Yuji Matsumoto; Tetsuya Hasegawa; Parhal Ahmet; Kiyomi Nakajima; Toyohiro Chikyow; Hironori Ofuchi; Izumi Nakai; Hideomi Koinuma

doi:10.1063/1.1695598

Cobalt valence states and origins of ferromagnetism in Co doped TiO ₂ rutile thin films

Makoto Murakami, Yuji Matsumoto, Tetsuya Hasegawa, Parhal Ahmet, Kiyomi Nakajima, Toyohiro Chikyow, Hironori Ofuchi, Izumi Nakai, Hideomi Koinuma

ENG - Applied Chemistry

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

70 Citations (Scopus)

Abstract

The fabrication of Co doped rutile thin films on α-Al ₂O₃ (10-12) substrates by laser molecular beam epitaxy was discussed. It was shown that the rutile thin films were (101) oriented and have smooth surfaces with no impurity phases by using X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The contribution of oxidized (Co²⁺) and metallic (Co⁰) cobalt to the ferromagnetism was also discussed. The observed ferromagnetism was uniform and was related to the electron band structure of TiO₂ rutile, according to magnetic circular dichroism studies. Characterization of Co doped rutile thin films showed that Co in rutile TiO₂ takes two valence states.

Original language	English
Pages (from-to)	5330-5333
Number of pages	4
Journal	Journal of Applied Physics
Volume	95
Issue number	10
DOIs	https://doi.org/10.1063/1.1695598
Publication status	Published - 2004 May 15

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abstract = "The fabrication of Co doped rutile thin films on α-Al 2O3 (10-12) substrates by laser molecular beam epitaxy was discussed. It was shown that the rutile thin films were (101) oriented and have smooth surfaces with no impurity phases by using X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The contribution of oxidized (Co2+) and metallic (Co0) cobalt to the ferromagnetism was also discussed. The observed ferromagnetism was uniform and was related to the electron band structure of TiO2 rutile, according to magnetic circular dichroism studies. Characterization of Co doped rutile thin films showed that Co in rutile TiO2 takes two valence states.",

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T1 - Cobalt valence states and origins of ferromagnetism in Co doped TiO 2 rutile thin films

AU - Murakami, Makoto

AU - Matsumoto, Yuji

AU - Hasegawa, Tetsuya

AU - Ahmet, Parhal

AU - Nakajima, Kiyomi

AU - Chikyow, Toyohiro

AU - Ofuchi, Hironori

AU - Nakai, Izumi

AU - Koinuma, Hideomi

PY - 2004/5/15

Y1 - 2004/5/15

N2 - The fabrication of Co doped rutile thin films on α-Al 2O3 (10-12) substrates by laser molecular beam epitaxy was discussed. It was shown that the rutile thin films were (101) oriented and have smooth surfaces with no impurity phases by using X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The contribution of oxidized (Co2+) and metallic (Co0) cobalt to the ferromagnetism was also discussed. The observed ferromagnetism was uniform and was related to the electron band structure of TiO2 rutile, according to magnetic circular dichroism studies. Characterization of Co doped rutile thin films showed that Co in rutile TiO2 takes two valence states.

AB - The fabrication of Co doped rutile thin films on α-Al 2O3 (10-12) substrates by laser molecular beam epitaxy was discussed. It was shown that the rutile thin films were (101) oriented and have smooth surfaces with no impurity phases by using X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The contribution of oxidized (Co2+) and metallic (Co0) cobalt to the ferromagnetism was also discussed. The observed ferromagnetism was uniform and was related to the electron band structure of TiO2 rutile, according to magnetic circular dichroism studies. Characterization of Co doped rutile thin films showed that Co in rutile TiO2 takes two valence states.

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Cobalt valence states and origins of ferromagnetism in Co doped TiO ₂ rutile thin films

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