Polarization selection in Mössbauer reflectivity for magnetic multilayer investigation

Abstract

Abstract Mössbauer reflectivity experiment with polarization selection are reported. The use of the LiF polarization analyzer allows us to get the π→σ’ peak on the reflectivity curve at the critical angle and Mössbauer π→σ’ reflectivity spectra of reasonable quality at the critical angle and also at the Bragg angles of superlattice. The impressive difference of the reflectivity spectra measured near the critical angle with and without polarizations analysis is observed for [57Fe10/V10]20 multilayer characterizing by the ferromagnetic interlayer coupling. The combined fit of the whole set of spectra measured at different angles reveals the existence of antiferromagnetic Fe oxide phases in the top three bilayers. The experiment demonstrates benefits of the Mössbauer reflectivity with polarization analysis in ultrathin surface layer investigations.