Magnetic-plasmonic core-shell nanoparticles.
Nanoparticles composed of magnetic cores with continuous Au shell layers simultaneously possess both magnetic and plasmonic properties. Faceted and tetracubic nanocrystals consisting of wustite with magnetite-rich corners and edges retain magnetic properties when coated with a Au shell layer, with the composite nanostructures showing ferrimagnetic behavior. The plasmonic properties are profoundly influenced by the high dielectric constant of the mixed iron oxide nanocrystalline core. A comprehensive theoretical analysis that examines the geometric plasmon tunability over a range of core permittivities enables us to identify the dielectric properties of the mixed oxide magnetic core directly from the plasmonic behavior of the core-shell nanoparticle.
Levin
Carly S
CS
Department of Chemistry, Rice University, Houston, TX 77251-1892, USA.
Hofmann
Cristina
C
Ali
Tamer A
TA
Kelly
Anna T
AT
Morosan
Emilia
E
Nordlander
Peter
P
Whitmire
Kenton H
KH
Halas
Naomi J
NJ
D008280:Magnetics; D053758:Nanoparticles