Depth resolved hyperfine interactions with standing waves in [W/Si] 10/Si/Ag/57Fe/Ag/Si multilayer

Abstract

Delayed nuclear resonant reflectivity (NRR) of [W/Si]10 /Si(z nm)/Ag/57Fe/Ag/Si multilayer as well as the time spectra at several grazing angles have been measured at the nuclear resonance beamline ID18/ID22N of the ESRF. NRR of 57Fe layer has been enhanced by standing waves created by Bragg reflection from [W/Si]10 backing and by multiple reflections from Ag adjacent layers. Fitting of the data was done with the program package REFTIM. The reconstructed HFI depth distributions show an essential asymmetry of the 57Fe interfaces. The total 57Fe density depth-profiles turn out to be in a good agreement with the measured Fe Kα fluorescence curve. © 2010 IOP Publishing Ltd.