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Published on: August 22, 2014
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Ferroplasmons: intense localized surface plasmons in metal-ferromagnetic nanoparticles
Ritesh Sachan1, Abhinav Malasi, Jingxuan Ge
1Department of Materials Science and Engineering, University of Tennessee , Knoxville, Tennessee 37996, United States.
ACS Nano
|July 29, 2014
Summary
Researchers discovered localized surface plasmon resonance (LSPR) in ferromagnetic cobalt and cobalt-iron alloys. These novel ferroplasmons (FP) exhibit intense, narrow bandwidths, opening new avenues for plasmonic material design.
Area of Science:
- Physics
- Materials Science
- Nanotechnology
Background:
- Localized surface plasmon resonance (LSPR) is a phenomenon typically observed in noble metals.
- Ferromagnetic materials have not previously exhibited intense LSPR with narrow bandwidths.
Purpose of the Study:
- To investigate the possibility of LSPR in ferromagnetic materials.
- To explore the plasmonic properties of bimetallic nanostructures involving ferromagnets.
Main Methods:
- Fabrication of bimetallic nanoparticles (Co/Ag, CoFe/Ag) using pulsed laser dewetting.
- Characterization of nanoparticle plasmonic properties using electron energy-loss spectroscopy (EELS) in a monochromated scanning transmission electron microscope.
Main Results:
- Discovery of LSPR in ferromagnetic cobalt and CoFe alloy nanoparticles in contact with silver.
- Observation of ferroplasmons (FP) in the visible spectrum with intensity and bandwidth comparable to LSPR in silver.
- Evidence of plasmonic interaction between adjacent silver and ferromagnetic nanoparticles.
Conclusions:
- Ferromagnetic materials can exhibit intense LSPR, termed ferroplasmons (FP).
- Bimetallic nanostructures are a viable route for synthesizing materials with novel plasmonic properties.
- This discovery may lead to advanced plasmonic materials and applications by combining ferromagnetism and LSPR.
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