Hyperfine field distribution at 59Co in amorphous Fe(Co)79P13B8 alloys

Abstract
We report the results of 59Co spin‐echo measurements at 4.2 °K in amorphous alloys of composition (Fe100−xCox)79P13B8, with x=1, 3, 4, 10, 20, 30, 40, 60, 70, 80, 90 and 100. A comparison is made also with the 59Co NMR spectrum in a‐Co3B. Evidence is shown for large quadrupolar effects in the dilute alloys. The influence of short‐range order on the hyperfine field distribution in concentrated Co alloys is pointed out.