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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
Published on: August 15, 2018
Magnetic-field-induced ferroelectric state in DyFeO3
Y Tokunaga1, S Iguchi, T Arima
1Multiferroics Project, ERATO, Japan Science and Technology Agency (JST), Wako, Saitama 351-0198, Japan.
Physical Review Letters
|October 15, 2008
Summary
Single crystal DyFeO3 exhibits giant magnetoelectric effects. A large linear magnetoelectric response and an induced multiferroic phase with significant magnetization and electric polarization were observed, driven by exchange striction.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid State Physics
Background:
- Magnetoelectric (ME) effects are crucial for advanced electronic devices.
- Dysprosium orthoferrite (DyFeO3) is a promising material for exploring ME phenomena.
Purpose of the Study:
- To investigate the magnetoelectric properties of single crystal DyFeO3.
- To identify the underlying mechanisms responsible for observed ME effects.
Main Methods:
- Single crystal growth of DyFeO3.
- Magnetic measurements to determine magnetization.
- Dielectric measurements to quantify electric polarization.
- Analysis of magnetoelectric tensor components.
Main Results:
- Observed a large linear magnetoelectric tensor component (alphazz ≈ 2.4 x 10(-2) esu) below the Dy ordering temperature.
- Induction of a multiferroic phase (weakly ferromagnetic and ferroelectric) with applied magnetic field along the c-axis.
- Significant magnetization (> 0.5 µB/f.u.) and electric polarization (> 0.2 µC/cm²) along the c-axis in the multiferroic phase.
Conclusions:
- DyFeO3 displays versatile and gigantic magnetoelectric phenomena.
- Exchange striction between Fe3+ and Dy3+ layers is proposed as the origin of ferroelectric polarization in the multiferroic phase.
- The findings highlight DyFeO3 as a potential candidate for future magnetoelectric applications.
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