Polar magneto-optics in simple ultrathin-magnetic-film structures.

摘要: For a better understanding of optical interactions in magnetic layered structures we establish general expressions both polar Kerr and Faraday first-order magneto-optical (MO) effects. The approach presented here enables the MO response an arbitrary layer system to be analytically expressed with accuracy practically equal (less than ${10}^{\mathrm{\ensuremath{-}}4}$ deg) that full matrix calculations usually employed for modeling effects multilayers. formulas any particular structure are obtained from by introducing associated reflection transmission coefficients. This procedure is justified simple case ultrathin film sandwiched between two nonmagnetic layers. These accurate further simplified films limitations this approximation discussed. then used analyze data well-defined Au (5 nm)/Co/Au (25 nm) structures, grown on float glass substrates. Co thicknesses chosen range 0.4\char21{}2.0 nm preserve perpendicular anisotropy. expressions, as well numerical trends spectra variation overlayer or buffer thicknesses, show shape effect spectrum mainly dependent upon properties whereas observed amplitudes reduced consistently absorption overlayer.