Magnetoplasmonic properties of perpendicularly magnetized [Co/Pt]N nanodots
| Autor: | Francisco Freire-Fernández, Rhodri Mansell, Sebastiaan van Dijken |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Bilayer Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics Surface plasmon polariton Spectral line Lattice (order) 0103 physical sciences Nanodot 010306 general physics 0210 nano-technology Anisotropy Plasmon Excitation |
| Zdroj: | Physical Review B. 101 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.101.054416 |
| Popis: | We demonstrate a tenfold resonant enhancement of magneto-optical effects in perpendicularly magnetized ${[\mathrm{Co}/\mathrm{Pt}]}_{N}$ nanodots mediated by the excitation of optimized plasmon modes. Two magnetoplasmonic systems are considered: square arrays of ${[\mathrm{Co}/\mathrm{Pt}]}_{N}$ nanodots on glass and identical arrays on a $\mathrm{Au}/\mathrm{Si}{\mathrm{O}}_{2}$ bilayer. On glass, the optical and magneto-optical spectra of the nanodot arrays are dominated by the excitation of a surface lattice resonance (SLR), whereas on $\mathrm{Au}/\mathrm{Si}{\mathrm{O}}_{2}$, a narrow surface plasmon polariton (SPP) resonance tailors the spectra further. Both the SLR and SPP modes are magneto-optically active leading to an enhancement of the Kerr angle. We detail the dependence of optical and magneto-optical spectra on the number of Co/Pt bilayer repetitions, the nanodot diameter, and the array period, offering design rules on how to maximize and spectrally tune the magneto-optical response of perpendicularly magnetized ${[\mathrm{Co}/\mathrm{Pt}]}_{N}$ nanodots. |
| Databáze: | OpenAIRE |
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