Evolution from soft to hard magnetic behavior in Co-based devitrified glassy alloy

Abstract
From the amorphous alloy 6030V having the composition Co71.5Fe1.5Mo1Mn4Si13B9, a series of devitrified specimens with increasingly coarser microstructure and magnetic hardening is produced by annealing. From the features of the coercivity, the squareness ratio, the rotational hysteresis integral, and the magnetic interactions we infer that the magnetic hardening is due initially (TaTa≳600 °C) to the formation of single‐domain Co crystallites where the magnetization reversal mode is of incoherent type.