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Ferromagnetism induced by lattice volume expansion and amorphization in EuTiO3 thin films

Published online by Cambridge University Press:  03 April 2013

Katsuhisa Tanaka ,
Koji Fujita ,
Yuya Maruyama ,
Yoshiro Kususe ,
Hideo Murakami ,
Hirofumi Akamatsu ,
Yanhua Zong  and
Shunsuke Murai
Katsuhisa Tanaka*
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
Koji Fujita
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
Yuya Maruyama
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
Yoshiro Kususe
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
Hideo Murakami
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
Hirofumi Akamatsu
Affiliation:
Department of Materials Science and Engineering, Graduate School of Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan
Yanhua Zong
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
Shunsuke Murai
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
*
a)Address all correspondence to this author. e-mail: tanaka@dipole7.kuic.kyoto-u.ac.jp
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Abstract

Lattice volume expansion or amorphization renders EuTiO3 ferromagnetic, although the stable phase of crystalline EuTiO3 is an antiferromagnet. The lattice volume expansion is induced into the crystalline EuTiO3 thin film by utilizing the lattice mismatch between the thin film and a substrate. The magnetization at low temperatures monotonically increases with an increase in lattice volume for the crystalline EuTiO3 thin film, coincident with the results of calculations based on the hybrid Hartree–Fock density functional approach. The ferromagnetic interaction between Eu2+ ions is enhanced by the amorphization as well; the amorphous EuTiO3 thin film becomes a ferromagnet, and the Curie temperature is higher for amorphous Eu2TiO4 than for its crystalline counterpart. The phenomenon, that is, the volume expansion- and amophization-induced ferromagnetism, is explained in terms of the competition between ferromagnetic and antiferromagnetic interactions among Eu2+ ions.

Type
Invited Feature Papers
Information
Journal of Materials Research , Volume 28 , Issue 8 , 28 April 2013 , pp. 1031 - 1041
Copyright
Copyright © Materials Research Society 2013

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