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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
Published on: August 15, 2018
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Bulk magnetoelectricity in the hexagonal manganites and ferrites
Hena Das1, Aleksander L Wysocki1, Yanan Geng2
1School of Applied and Engineering Physics, Cornell University, 224 Clark Hall, Ithaca, New York 14853, USA.
Nature Communications
|January 7, 2014
Summary
Trimerization in hexagonal manganites induces bulk magnetization and magnetoelectric effects, creating a linear magnetoelectric vortex structure. This phenomenon, observable in RFeO3 ferrites, offers new avenues for multiferroic materials research.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid State Chemistry
Background:
- Hexagonal manganites (RMnO3) exhibit improper ferroelectricity due to trimerization.
- This structural distortion creates coupled structural and magnetic vortices.
- Existing domain wall effects do not manifest in the bulk properties.
Purpose of the Study:
- To investigate the induction of bulk magnetization and magnetoelectric effects in hexagonal manganites.
- To elucidate the role of trimerization in creating bulk multiferroic properties.
- To identify new material families exhibiting these phenomena.
Main Methods:
- First-principles calculations
- Group-theoretic techniques
- Microscopic spin models
Main Results:
- Trimerization induces both bulk magnetization (M) and bulk magnetoelectric (ME) effects.
- A bulk linear ME vortex structure is identified, where polarization (P) reversal leads to M reversal.
- The predicted ME vortex can be measured in RMnO3 under a large magnetic field.
Conclusions:
- Hexagonal manganites possess intrinsic bulk ME coupling driven by trimerization.
- Hexagonal RFeO3 ferrites are predicted to exhibit similar ME phenomena in their ground state.
- This research opens pathways for designing novel multiferroic materials with bulk ME coupling.
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