Orientation-Dependent Optical Magnetoelectric Effect in Patterned BaTiO₃/La_0.67Sr_0.33MnO₃ Heterostructures

Area of Science:

• Condensed Matter Physics
• Materials Science
• Optoelectronics

Background:

• The optical magnetoelectric effect is crucial for advanced devices, but achieving it with large tunability at room temperature remains a significant challenge.
• Ferroelectric/ferromagnetic heterostructures offer potential for novel magnetoelectric properties due to the coupling between electric and magnetic orders.

Purpose of the Study:

• To design and investigate ferroelectric/ferromagnetic heterostructures for room-temperature optical magnetoelectric effects.
• To explore the influence of film orientation on the magnetoelectric response.

Main Methods:

• Fabrication of BaTiO3/La0.67Sr0.33MnO3 heterostructures with different crystallographic orientations.
• Patterning of a 4 μm grating structure on the bilayer thin films.
• Systematic investigation of the optical magnetoelectric effect using Bragg diffraction in near-infrared light, under both reflection and transmission geometries.

Main Results:

• The designed heterostructures exhibit room-temperature ferroelectric and ferromagnetic properties.
• A significant optical magnetoelectric effect was observed, dependent on magnetization and polarization.
• The (111)-oriented thin film demonstrated a stronger optical magnetoelectric effect compared to the (100)-oriented sample.

Conclusions:

• The study successfully demonstrates a room-temperature optical magnetoelectric effect in ferroelectric/ferromagnetic heterostructures.
• The orientation of the heterostructure plays a critical role in the strength of the optical magnetoelectric effect.
• These findings provide a pathway for developing next-generation optical magnetoelectric devices.