JMMM 121 (1993) 49-52

Effects of interfacial roughness on site-probed multilayers of 
Fe(100)/Ag(100)

D.J. Keavney, M.D. Wieczorek, D.F. Storm and J.C. Walker

Mossbauer spectroscopy was performed on three [Fe_9(100)/Ag_40(100)]_25 
multilayers grown by molecular beam epitaxy (MBE). All of the Fe bilayer 
components in each sample were selectively loaded with 2 monolayers (ML) 
of Fe-57: at the Fe-on-Ag interfaces of one sample, at the Ag-on-Fe 
interfaces of another, and at the Fe bilayer centers of the third. The 
hyperfine fields, quadrupole splittings, and isomer shifts of these 
multilayers were measured at 16, 100 and 300 K. We observed widely 
different values and trends as the temperature increased, leading us to 
repeat an earlier claim that three rather than two distinct sites are 
needed to correctly describe the Fe bilayer components in Fe(100)/Ag(100) 
multilayered systems.