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- W2912065880 abstract "We report a giant enhancement of the midinfrared magneto-optical complex Kerr angle (polarization change of reflected light) in a variety of materials grown on SiC. In epitaxially grown multilayer graphene, the Kerr angle is enhanced by a factor of 68, which is in good agreement with Kerr signal modeling. Strong Kerr enhancement is also observed in Fe films grown on SiC and Al-doped bulk SiC. Our experiments and modeling indicate that the enhancement occurs at the high-energy edge of the SiC reststrahlen band where the real component of the complex refractive index ${stackrel{ifmmode tilde{}else ~{}fi{}}{n}}_{}$ passes through unity. Furthermore, since the signal is greatly enhanced when $stackrel{ifmmode tilde{}else ~{}fi{}}{n}=1$, the enhancement is predicted to exist over the entire visible and IR spectrum for a free-standing film. We also predict similar giant enhancement in both Faraday (transmission) and Kerr rotation for thin films on a metamaterial substrate with refractive index ${stackrel{ifmmode tilde{}else ~{}fi{}}{n}}_{}=ensuremath{-}1$. This paper demonstrates that the substrate used in magneto-optical Kerr effect (MOKE) measurements must be carefully chosen when investigating magneto-optical materials with weak MOKE signals or when designing MOKE-based optoelectronic devices." @default.
- W2912065880 created "2019-02-21" @default.
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- W2912065880 date "2019-02-27" @default.
- W2912065880 modified "2023-10-15" @default.
- W2912065880 title "Giant magneto-optical Kerr enhancement from films on SiC due to the optical properties of the substrate" @default.
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- W2912065880 doi "https://doi.org/10.1103/physrevb.99.085440" @default.
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