In situAC-hysteresis measurements of SPD-processed Cu20(Fe15Co85)80

The changes of magnetic properties upon heat treatment of a metastable supersaturated solid solution processed by severe plastic deformation are investigated by in situ AC-hysteresis measurements. Data are analyzed in the framework of dynamic loss theory, with correlative investigations of the microstructural properties. The evolution of hysteresis upon annealing points out that the single-phase supersaturated solid solution remains stable up to 400° C, then hindering of domain wall motion sets in at this temperature. At 600° C, a multi phase microstructure is present, causing a significant increase in coercivity.