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Ferromagnetism in Fe-doped β-Ga2O3 Prepared by a Solid State Reaction

Published online by Cambridge University Press:  01 February 2011

Hajime Hojo ,
Koji Fujita ,
Katsuhisa Tanaka  and
Kazuyuki Hirao
Hajime Hojo
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan.
Koji Fujita
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan.
Katsuhisa Tanaka
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan.
Kazuyuki Hirao
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan.
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Abstract

Polycrystalline β-Ga2O3 doped with Fe3+, (Ga1−x Fex)2O3 (x=0.02, 0.05, 0.08 and 0.1), has been prepared by a solid-state reaction. Ferromagnetic ordering is observed at room temperature for samples prepared by β-Ga2O3 and Fe(NO3)3·9H2O and sintered at low temperatures below 900 °C, while the sintering at temperatures above 900 °C leads to the paramagnetic behavior. X-ray diffraction analysis for the samples sintered at 500 °C reveals that the single phase of β-Ga2O3 can be obtained up to x=0.08 without traces of secondary phase or other impurity. Magnetization as a function of temperature shows superparamagnetic or cluster spin-glass behavior, indicating that long-range ferromagnetic ordering does not exist in the present systems. It is suggested that the inhomogeneous distribution of Fe3+ is responsible for the ferromagnetic behavior.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 853: Symposium I – Fabrication and New Applications of Nanomagnetic Structures , 2004 , I4.25
Copyright
Copyright © Materials Research Society 2005

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References

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