Size dependence of domain pattern transfer in multiferroic heterostructures

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Multiferroic heterostructures exhibit magnetoelectric coupling, influencing magnetic properties.
• Ferroelectric domains can be imprinted onto ferromagnetic films via magnetoelectric effects.
• Internal magnetic interactions (exchange, magnetostatic) resist domain pattern formation.

Purpose of the Study:

• Investigate the limitations of ferroelectric domain imprinting in ferromagnetic films.
• Analyze the role of competing energies in domain pattern transfer.
• Explore the impact of magnetic field rotation on magnetic anisotropy.

Main Methods:

• Micromagnetic simulations were employed to model the system.
• A one-dimensional model was developed to analyze energy competition.
• Experimental validation was performed on Cobalt-Iron-Boron/Barium Titanate (CoFeB/BaTiO3) heterostructures.

Main Results:

• A critical domain size was identified, below which domain pattern transfer breaks down due to competing energies.
• Abrupt transitions between two magnetic anisotropy scaling regimes were observed upon magnetic field rotation.
• Experimental results on CoFeB/BaTiO3 heterostructures confirmed the theoretical predictions.

Conclusions:

• The study elucidates the fundamental mechanisms limiting magnetoelectric domain imprinting.
• Understanding these energy competitions is crucial for designing advanced multiferroic devices.
• The observed magnetic anisotropy transitions offer new avenues for magnetic memory and spintronic applications.