FERROMAGNETIC FERROELECTRIC SUBSTANCE AND PROCESS FOR PRODUCING THE SAME

WIPO Patent Application WO/2006/028005

A1

A novel material simultaneously having ferromagnetism and ferroelectricity. There is provided a ferromagnetic ferroelectric substance characterized in that it is a substance of the perovskite structure of the composition formula Bi₂MM’O₆ or Pb₂MM’O₆ wherein M is a transition metal ion having an electron in part of its e_g-orbit while M’ is a transition metal ion having no electron in its e_g-orbit. In particular, Bi₂CuMnO₆ has a ferromagnetic transition temperature of 340 K, simultaneously exhibiting ferromagnetism and ferroelectricity even at room temperature.

AZUMA MASAKI (JP)
TERASHIMA TAKAHITO (JP)
TAKATA KAZUHIDE (JP)
HASHISAKA MASAYUKI (JP)
ISHIWATA SHINTARO (JP)
MIBU KO (JP)
SHIMAKAWA YUICHI (JP)
TAKANO MIKIO (JP)

PCT/JP2005/016083

March 16, 2006

September 02, 2005

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UNIV KYOTO (JP)
AZUMA MASAKI (JP)
TERASHIMA TAKAHITO (JP)
TAKATA KAZUHIDE (JP)
HASHISAKA MASAYUKI (JP)
ISHIWATA SHINTARO (JP)
MIBU KO (JP)
SHIMAKAWA YUICHI (JP)
TAKANO MIKIO (JP)

H01B3/12; C01G45/00; C01G51/00; C01G53/00; H01F1/34; H01F41/18; H01L29/82

EP0270099A2	1988-06-08
DE4121474A1	1992-01-02
JPH11286774A	1999-10-19
JPH02170306A	1990-07-02
JPH07221356A	1995-08-18

AZUMA M.: "Search for New Transition Metal Oxides and Single Crystal Growth at High Pressures.", JOURNAL OF THE JAPAN SOCIETY OF POWDER AND POWDER METALLURGY., vol. 50, no. 4, 2003, pages 277 - 283, XP002995038

Kobayasi, Ryohei (7th Floor Hougen-Sizyokarasuma Building, 37, Motoakuozi-tyo, Higasinotouin Sizyo-sagaru, Simogyo-k, Kyoto-si Kyoto 91, JP)

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