Microstructure and properties of well-ordered multiferroic Pb(Zr,Ti)O(3)/CoFe(2)O(4) nanocomposites

Area of Science:

• Materials Science
• Nanotechnology
• Condensed Matter Physics

Background:

• Multiferroic nanocomposites offer potential for advanced electronic devices.
• Precise control over nanostructure morphology is crucial for optimizing multiferroic properties.
• Existing fabrication methods often lack the precision required for complex heterostructures.

Purpose of the Study:

• To introduce a new nanofabrication technique for creating diverse multiferroic nanocomposites.
• To investigate the structural, magnetic, and piezoelectric properties of these novel materials.
• To demonstrate magnetoelectric coupling in the fabricated nanodot-matrix composites.

Main Methods:

• Utilized pulsed laser deposition combined with a nanoporous anodic aluminum oxide membrane mask.
• Fabricated various configurations: CoFe(2)O(4) dots with Pb(Zr,Ti)O(3) layer, Pb(Zr,Ti)O(3) dots with CoFe(2)O(4), and bilayer heterostructures.
• Characterized properties using piezoresponse force microscopy (PFM) and magnetic-field dependent capacitance measurements.

Main Results:

• Achieved epitaxial nanodot-matrix composites by tuning processing parameters.
• Observed an unexpected out-of-plane magnetic easy axis in CoFe(2)O(4)/Pb(Zr,Ti)O(3) composites.
• Demonstrated strong piezoelectric signals and significant magnetoelectric coupling.

Conclusions:

• The proposed nanofabrication technique enables precise control over multiferroic nanocomposite structures.
• The resulting materials exhibit unique magnetic properties and strong piezoelectric responses.
• These findings pave the way for developing novel multiferroic devices with coupled functionalities.