Synthesis and magnetic properties of non-equilibrium Eu-rich EuO thin films

Toyohiko J. Konno; Norihiro Ogawa; Kimio Wakoh; Kenji Sumiyama; Kenji Suzuki

Synthesis and magnetic properties of non-equilibrium Eu-rich EuO thin films

Toyohiko J. Konno, Norihiro Ogawa, Kimio Wakoh, Kenji Sumiyama, Kenji Suzuki

Materials Processing and Characterization Division

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

15 Citations (Scopus)

Abstract

EuO thin films have been formed by reactive evaporation, in which O₂ gas was introduced in the form of a molecular beam directed toward a substrate. In order to optimize preparation conditions, we varied the substrate temperature, T_s. and the ratio of the Eu vapor to O₂ gas deposition rates. R. The structure and magnetic properties of the films were measured by X-ray diffraction and a super-conducting interference device (SQUID) magnetometer. Non-stoichiometric EuO films can be produced more easily at T_s = 200°C than at T_s -300°C. Choosing an appropriate value of R at T_s = 200°C, we obtain Eu-rich EuO films with the Curie temperature of about 150 K. The present method is based on the control of reaction kinetics, and is superior to the post-oxidation method of Eu-metals with respect to the formation of Eu-rich EuO films.

Original language	English
Pages (from-to)	6052-6056
Number of pages	5
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	35
Issue number	12 A
Publication status	Published - 1996 Dec 1

Keywords

Europium oxide
Magnetic properties
Reactive evaporation
Thin film
X-ray diffraction

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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Synthesis and magnetic properties of non-equilibrium Eu-rich EuO thin films. / Konno, Toyohiko J.; Ogawa, Norihiro; Wakoh, Kimio; Sumiyama, Kenji; Suzuki, Kenji.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 35, No. 12 A, 01.12.1996, p. 6052-6056.

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

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abstract = "EuO thin films have been formed by reactive evaporation, in which O2 gas was introduced in the form of a molecular beam directed toward a substrate. In order to optimize preparation conditions, we varied the substrate temperature, Ts. and the ratio of the Eu vapor to O2 gas deposition rates. R. The structure and magnetic properties of the films were measured by X-ray diffraction and a super-conducting interference device (SQUID) magnetometer. Non-stoichiometric EuO films can be produced more easily at Ts = 200°C than at Ts -300°C. Choosing an appropriate value of R at Ts = 200°C, we obtain Eu-rich EuO films with the Curie temperature of about 150 K. The present method is based on the control of reaction kinetics, and is superior to the post-oxidation method of Eu-metals with respect to the formation of Eu-rich EuO films.",

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AU - Konno, Toyohiko J.

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AU - Suzuki, Kenji

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AB - EuO thin films have been formed by reactive evaporation, in which O2 gas was introduced in the form of a molecular beam directed toward a substrate. In order to optimize preparation conditions, we varied the substrate temperature, Ts. and the ratio of the Eu vapor to O2 gas deposition rates. R. The structure and magnetic properties of the films were measured by X-ray diffraction and a super-conducting interference device (SQUID) magnetometer. Non-stoichiometric EuO films can be produced more easily at Ts = 200°C than at Ts -300°C. Choosing an appropriate value of R at Ts = 200°C, we obtain Eu-rich EuO films with the Curie temperature of about 150 K. The present method is based on the control of reaction kinetics, and is superior to the post-oxidation method of Eu-metals with respect to the formation of Eu-rich EuO films.

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