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

A measurement of the six-line Mossbauer Zeeman spectrum of (57)Fe in Fe(80)B(20) ferromagnetic glass reveals a linewidth asymmetry involving the three line-pairs L(1) and L(7-1), i = 1,2,3. The source of this asymmetry 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.