Abstract
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.
| Original language | English |
|---|---|
| Article number | 054416 |
| Number of pages | 9 |
| Journal | Physical Review B |
| Volume | 101 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 11 Feb 2020 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- CURRENT-DRIVEN DYNAMICS
- ANISOTROPY
- CO/PT
- HYBRIDIZATION