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Self-Assembled Complex Three-Phase Core-Shell Nanostructure of Au-CoFe2-TiN with a Magneto-Optical Coupling Effect
Jiawei Song1, Di Zhang1,2, Ping Lu3
1School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States.
ACS Applied Materials & Interfaces
|July 26, 2023
Summary
Researchers developed novel plasmonic-magnetic metamaterials using cobalt iron (CoFe2), titanium nitride (TiN), and gold (Au). These hybrid nanostructures show enhanced magneto-optical coupling effects, paving the way for advanced optical and magnetic applications.
Area of Science:
- Materials Science
- Nanotechnology
- Condensed Matter Physics
Background:
- Plasmonic-magnetic metamaterials are of significant research interest due to their amplified magneto-optical coupling.
- Developing multifunctional hybrid metamaterials with integrated optical and magnetic properties is crucial for advanced applications.
Purpose of the Study:
- To design and fabricate a complex three-phase nanocomposite combining ferromagnetic cobalt iron (CoFe2) with plasmonic titanium nitride (TiN) and gold (Au).
- To investigate two distinct fabrication methods: cogrowth and templated growth, for creating these hybrid metamaterials.
- To evaluate the structural, magnetic, and magneto-optical properties of the resulting nanostructures.
Main Methods:
- Cogrowth method: Simultaneous growth of three phases (CoFe2, TiN, Au) resulting in core-shell nanopillar morphologies.
- Templated growth method: Sequential deposition to achieve highly ordered, uniform single-type core-shell nanopillars (CoFe2 shell with Au core) within a TiN matrix.
- Characterization of epitaxial quality, hyperbolic dispersion, magnetic anisotropy, and magneto-optical coupling effects.
Main Results:
- Cogrowth yielded three distinct core-shell nanopillar morphologies within the TiN matrix.
- Templated growth produced highly ordered and uniform single-type core-shell nanopillars.
- Both fabrication methods resulted in hybrid systems with excellent epitaxial quality, hyperbolic dispersion, magnetic anisotropy, and significant magneto-optical coupling.
Conclusions:
- The study successfully demonstrates an effective approach for fabricating highly uniform, multiphase, vertically aligned nanocomposite structures.
- The developed TiN-CoFe2-Au hybrid metamaterials exhibit well-integrated optical, magnetic, and coupling properties.
- These findings offer a pathway for creating advanced materials with tunable magneto-optical responses.
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