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K P Jayachandran1, J M Guedes2, H C Rodrigues2

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This study optimizes magnetoelectric (ME) composites for maximum coupling. Preferentially oriented ferroelectric materials significantly enhance ME coupling through interface shear strains.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Magnetoelectric (ME) effect enables electrical control of magnetization in materials with electric and magnetic dipole moments.
  • Laminar ME composites offer tunable properties by controlling ferroelectric and ferromagnetic phases.
  • Optimizing microstructure is crucial for maximizing the ME coupling coefficient (α).

Purpose of the Study:

  • To determine the optimal microstructure for maximizing the magnetoelectric coupling coefficient (α) in laminar ME composites.
  • To investigate the role of ferroelectric phase thickness and orientation in enhancing ME coupling.
  • To identify configurations that lead to a significant increase in ME coupling.

Main Methods:

  • Stochastic optimization combined with homogenization techniques.
  • Simulated annealing using a generalized Monte Carlo scheme for optimization.
  • Pole figure analysis to determine the preferential orientation of the ferroelectric phase.

Main Results:

  • Optimal microstructures for both single and poly-crystalline configurations were identified, enhancing the overall ME coupling coefficient (α).
  • Juxtaposing preferentially oriented ferroelectric materials with ferromagnetic ferrites resulted in a manifold increase in ME coupling.
  • Interface shear strains were found to be a significant contributor to the enhanced ME coupling.

Conclusions:

  • Preferential orientation of the ferroelectric phase is key to maximizing magnetoelectric coupling in composite laminates.
  • The developed optimization approach successfully identifies microstructures with superior ME properties.
  • This work provides insights into designing advanced ME composite materials for electrical control of magnetism.