Enhanced Resonance Magnetoelectric Coupling in (1-1) Connectivity Composites

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Bulk magnetoelectric (ME) composites are crucial for next-generation electronic devices.
• Existing ME composites with various connectivities (3-0, 3-1, 2-2, 2-1) aim for strong ME coupling.
• Further advancements are needed to enhance ME coupling coefficients and magnetic sensitivity.

Purpose of the Study:

• To develop novel 1D (1-1) connectivity ME composites with enhanced magnetoelectric coupling.
• To investigate the effect of laser treatment on amorphous FeBSi alloy (Metglas) within ME composites.
• To achieve superior resonant ME coupling and magnetic sensitivity at room temperature.

Main Methods:

• Fabrication of 1D (1-1) ME composites using [011]-oriented PMN-PT single-crystal fibers laminated with laser-treated Metglas.
• Operation in L-T mode (longitudinally magnetized, transversely poled).
• Theoretical analysis using magnetic-circuit and equivalent-circuit methods.

Main Results:

• Achieved an enhanced resonant ME coupling coefficient of approximately 7000 V cm⁻¹ Oe⁻¹, nearly seven times higher than previous records.
• Demonstrated a superhigh magnetic sensitivity of 1.35 × 10⁻¹³ T at resonance.
• Observed significant enhancement attributed to reduced resonance loss in laser-treated Metglas and magnetic flux concentration.

Conclusions:

• The developed 1D (1-1) ME composites represent a significant advance in bulk magnetoelectric materials.
• Laser treatment of Metglas leading to nanocrystallization is key to improved performance.
• The findings pave the way for highly sensitive magnetic sensors and novel electronic devices.