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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
Published on: March 27, 2018
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Metamagnetism stabilized giant magnetoelectric coupling in ferroelectric xBaTiO3-(1 - x)BiCoO3 solid solution.
Lokanath Patra1, Zhao Pan, Jun Chen
1Department of Physics, Central University of Tamil Nadu, Thiruvarur 610101, India. raviphy@cutn.ac.in.
Physical Chemistry Chemical Physics : PCCP
|February 23, 2018
Summary
We explored magnetoelectric coupling in BaTiO3-BiCoO3, finding that magnetic and ferroelectric properties are linked. Adjusting BaTiO3 concentration tunes the high-spin to low-spin transition and magnetoelectric effects.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid State Chemistry
Background:
- Magnetoelectric coupling is crucial for advanced electronic devices.
- Understanding the interplay between magnetic and ferroelectric properties is key to designing new materials.
- Barium titanate (BaTiO3) and bismuth cobaltate (BiCoO3) are known for their ferroelectric and magnetic properties, respectively.
Purpose of the Study:
- To investigate the correlation between magnetoelectric coupling and magnetic instability in xBaTiO3-(1-x)BiCoO3.
- To determine how BaTiO3 concentration and volume affect the structural, magnetic, and ferroelectric properties.
- To explore the mechanisms behind magnetoelectric coupling and spin transitions.
Main Methods:
- Density functional theory (DFT) calculations, including GGA and GGA+U approximations.
- Synchrotron X-ray diffraction and magnetic measurements.
- Analysis of spin-density-functional band structure, orbital-projected density of states, electron localization function, and Born effective charge.
Main Results:
- G-type antiferromagnetic ordering is favored for x < 0.45; higher concentrations stabilize nonmagnetic states.
- Metamagnetic spin state transitions correlate with paraelectric-to-ferroelectric transitions.
- A pressure-induced high-spin (HS) to low-spin (LS) transition was observed for x = 0.33 at <2.5% volume compression.
- Spontaneous ferroelectric polarization is high for low x values and inversely related to BaTiO3 concentration.
- Both Bi lone pairs and Ti d0-ness contribute to net polarization.
Conclusions:
- A strong magnetoelectric coupling exists in xBaTiO3-(1-x)BiCoO3, influenced by magnetic instability.
- The high-spin to low-spin transition point and magnetoelectric coupling strength can be tuned by varying the BaTiO3 concentration (x).
- The findings provide insights into designing materials with tunable magnetoelectric properties for potential applications.
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