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Published on: February 20, 2016
Plasmonically enhanced Faraday effect in metal and ferrite nanoparticles composite precipitated inside glass
Seisuke Nakashima1, Koji Sugioka, Katsuhisa Tanaka
1Department of Solid State Materials and Engineering, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Yokohama, Kanagawa 240-8501, Japan. nakashima@ynu.ac.jp
Abstract:
Using femtosecond laser irradiation and subsequent annealing, nanocomposite structures composed of spinel-type ferrimagnetic nanoparticles (NPs) and plasmonic metallic NPs have been formed space-selectively within glass doped with both α-Fe(2)O(3) and Al. The Faraday rotation spectra exhibit a distinct negative peak at around 400 nm, suggesting that the ferrimagnetic Faraday response is enhanced by the localized surface plasmon resonance (LSPR) due to metallic Al NPs. At the interfaces in the nanocomposites, the ferrimagnetism of magnetite NPs is directly coupled with the plasmon in the Al NPs. The control of the resonance wavelength of the magneto-optical peaks, namely, the size of plasmonic NPs has been demonstrated by changing the irradiation or annealing conditions.
