Browsing by Author "Freire-Fernandez, Francisco"

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  • Magnetoplasmonic properties of perpendicularly magnetized [Co/Pt](N) nanodots
    (2020-02-11) Freire-Fernandez, Francisco; Mansell, Rhodri; van Dijken, Sebastiaan
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    We demonstrate a tenfold resonant enhancement of magneto-optical effects in perpendicularly magnetized [Co/Pt](N) nanodots mediated by the excitation of optimized plasmon modes. Two magnetoplasmonic systems are considered: square arrays of [Co/Pt](N) nanodots on glass and identical arrays on a Au/SiO2 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 Au/SiO2, 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 [Co/Pt](N) nanodots.