Nuclear resonance reflectivity from a [~(57)Fe/Cr]_(30) multilayer with the Synchrotron M?ssbauer Source

摘要

M?ssbauer reflectivity spectra and nuclear resonance reflectivity (NRR) curves have been measured using the Synchrotron M?ssbauer Source (SMS) for a [~(57)Fe/Cr]_(30) periodic multilayer, characterized by the antiferromagnetic interlayer coupling between adjacent ~(57)Fe layers. Specific features of the M?ssbauer reflectivity spectra measured with π-polarized radiation of the SMS near the critical angle and at the 'magnetic' maximum on the NRR curve are analyzed. The variation of the ratio of lines in the M?ssbauer reflectivity spectra and the change of the intensity of the 'magnetic' maximum under an applied external field has been used to reveal the transformation of the magnetic alignment in the investigated multilayer.