Possibility of ferroelectricity in Yttrium iron garnet single crystal

S. Takano Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki, 305, Japan; Sumitomo 3M Ltd. Sagamihara, Kanagawa, 229, Japan

E. Kita Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki, 305, Japan

A. Tasaki Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki, 305, Japan

K. Furukawa Department of Physics, Waseda University, Shinjuku-ku, Tokyo, 169, Japan; NTT Basic Research Laboratories, Musashino, Tokyo, 180, Japan

K. Kohn Department of Physics, Waseda University, Shinjuku-ku, Tokyo, 169, Japan

K. Siratori Department of Physics, Osaka University, Toyonaka, Osaka, 560, Japan

S. Kimura National Institute for Research in Inorganic Materials, Tsukuba, Ibaraki, 305, Japan

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Abstract

We observed the first order magnetoelectric effect in a YIG single crystal in the temperature range below 125 K. The magnetoelectric signal was strongly influenced by the electric field applied along the [110] direction during cooling the sample down to 77 K. It reversed the sign when the electric field was applied in the opposite direction during cooling. Its magnitude composed of two parts; the one which was linear in the cooling field and the residual part. From the experimental results we conclude that YIG has a phase transition at 125 K below which it is a polar crystal.

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Possibility of ferroelectricity in Yttrium iron garnet single crystal

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Possibility of ferroelectricity in Yttrium iron garnet single crystal

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