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Related Experiment Videos

Designed ferromagnetic, ferroelectric Bi(2)NiMnO(6).

Masaki Azuma1, Kazuhide Takata, Takashi Saito

  • 1Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611-0011, Japan. masaki@scl.kyoto-u.ac.jp

Journal of the American Chemical Society
|June 16, 2005
PubMed
Summary

A new material, Bi(2)NiMnO(6), exhibits both ferromagnetic and ferroelectric properties. This discovery opens pathways for designing novel multiferroic materials for advanced applications.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Crystallography

Background:

  • Multiferroic materials exhibiting simultaneous ferroelectric and ferromagnetic properties are highly sought after for technological applications.
  • Designing materials with coupled magnetic and electric ordering remains a significant challenge in condensed matter physics.

Purpose of the Study:

  • To synthesize and characterize a novel double perovskite compound, Bi(2)NiMnO(6), for potential multiferroic properties.
  • To investigate the structural, ferroelectric, and ferromagnetic characteristics of the newly designed material.

Main Methods:

  • High-pressure synthesis at 6 GPa was employed to prepare the Bi(2)NiMnO(6) compound.
  • Synchrotron X-ray powder diffraction was utilized to determine the crystal structure.

Related Experiment Videos

  • Ferroelectric and ferromagnetic properties were measured to determine transition temperatures.

    • Main Results:

    • A heavily distorted double perovskite structure with ordered Ni(2+) and Mn(4+) ions in a rock-salt configuration was identified.
    • The compound exhibits ferroelectric properties with a Curie temperature (T(CE)) of 485 K, attributed to Bi(3+) lone pairs and Bi-O bonds.
    • Ferromagnetism was observed with a Curie temperature (T(CM)) of 140 K, arising from -Ni(2+)-O-Mn(4+)-O-Ni(2+)- magnetic pathways.

    Conclusions:

    • The newly designed Bi(2)NiMnO(6) compound successfully demonstrates coupled ferromagnetic and ferroelectric behavior.
    • The material design strategy, involving the ordered distribution of magnetic elements on B sites, is effective for creating multiferroic perovskites.
    • This approach can be extended to other Bi- and Pb-based perovskite systems to discover new ferromagnetic ferroelectrics.