Tunable Core-Shell Metal Alloy Pillar Design in Vertically Aligned Nanostructures Toward Multifunctionality.

Area of Science:

• Materials Science
• Nanotechnology
• Physics

Background:

• Multiphase nanostructures enable multifunctional materials through integrated functionalities.
• Vertically aligned nanocomposites (VANs) offer a platform for combining diverse material properties.

Purpose of the Study:

• To explore alloy-based VAN thin films with tunable properties.
• To investigate the fabrication and characteristics of Au, Cu, Co, and Ni alloy nanopillars in a BaTiO3 matrix.

Main Methods:

• Pulsed laser deposition was used to fabricate core-shell alloy VANs.
• Substrate temperature and deposition frequency were controlled to tune pillar morphology.
• Computational modeling was employed to understand structure-property relationships.

Main Results:

• Tunable optical anisotropy, hyperbolic response, and magnetic anisotropy were achieved.
• Plasmonic resonances and magneto-optical coupling were observed.
• Pillar morphology was linked to surface energies, strain, and thermal expansion.

Conclusions:

• Alloy VANs offer a versatile platform for designing hybrid metamaterials.
• Understanding phase separation dynamics is key to controlling nanostructure morphology and properties.
• These materials hold promise for next-generation spintronic and photonic devices.