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Control of Ferroelectric Phases by 4f Magnetic Moments in Multiferroic RMnO3 Crystals

Published online by Cambridge University Press:  26 February 2011

Hideki Kuwahara ,
K. Noda ,
M. Akaki ,
F. Nakamura  and
D. Akahoshi
Hideki Kuwahara
Affiliation:
[email protected], Sophia Univ., Dept. of Phys., 7-1 Kioi-cho, Chiyoda-ku, Tokyo, 102-8554, Japan, +81-3-3238-3430, +81-3-3238-3430
K. Noda
Affiliation:
[email protected], Sophia Univ., Dept. of Phys., 7-1 Kioi-cho, Chiyoda-ku, Tokyo, 102-8554, Japan
M. Akaki
Affiliation:
[email protected], Sophia Univ., Dept. of Phys., 7-1 Kioi-cho, Chiyoda-ku, Tokyo, 102-8554, Japan
F. Nakamura
Affiliation:
[email protected], Sophia Univ., Dept. of Phys., 7-1 Kioi-cho, Chiyoda-ku, Tokyo, 102-8554, Japan
D. Akahoshi
Affiliation:
[email protected], Sophia Univ., Dept. of Phys., 7-1 Kioi-cho, Chiyoda-ku, Tokyo, 102-8554, Japan
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Abstract

We have investigated the magnetoelectric (ME) properties of the orthorhombic RMnO3 (R=mixed rare earth ions) crystals with and without the 4f magnetic moments, while keeping an average ionic size of R. In the presence of the magnetic contribution from the R ions ((Eu,Ho)MnO3), we have observed the ferroelectric polarization along the c axis (Pc) in a zero field, which arises from the bc spiral structure stabilized by the anisotropic exchange interaction between the R and Mn sublattices like TbMnO3. The Pc phase can be transferred to Pa by application of fields of ∼1.5 T parallel to the b axis. The observed decrease of transition field compared with TbMnO3 suggests that the magnetic contribution and the local distortion of the R ions are key factors for governing the ME properties.

Keywords

magnetic propertiesferroelectricitydielectric properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 966: Symposium T – Ferroelectrics and Multiferroics , 2006 , 0966-T06-02
Copyright
Copyright © Materials Research Society 2007

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References

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