Amorphous magnetic films for broadband γ-filters of synchrotron radiation

The results of the Mössbauer spectroscopy investigations of amorphous magnetic Fe57/C films, produced by the pulse-laser deposition and magnetron sputtering are presented. The Mössbauer electron conversion spectroscopy method is shown to provide an opportunity for spectral line broadening up to 63Γ0, and for controlling the filter width by varying the iron concentration in amorphous films at sputtering. The manipulation by the width of nuclear-resonant spectra is also possible by varying the temperature near Curie point. Another way of further broadening the Mössbauer spectra by means of multilayer interference structures containing a resonant isotope are discussed.