Linewidth asymmetries in the Mössbauer Zeeman spectrum of amorphous iron-metalloid alloys

Abstract

A measurement of the six-line Mössbauer Zeeman spectrum of 57Fe in Fe80B20 ferromagnetic glass reveals a linewidth asymmetry involving the three line-pairs Li and L7−i, i = 1,2,3. The source of this assymetry is found to be a positive correlation between isomer shift and hyperfine field and a negative correlation between hyperfine field and quadrupole energy with a degree of linearity of 15% and 18% respectively. A complete linewidth analysis is given which also leads to separate estimates of the widths of the hyperfine field, isomer shift and electric field gradient distributions in the glass.