Magnetic properties and microstructure of nanocrystalline soft magnetic Fe73.5-xCoxCu1Nb3Si13.5B9 alloys

The influence of the annealing temperature, cooling rate, and magnetic field frequency in thermomagnetic treatment on the magnetic parameters of nanocrystalline Fe73.5-xCoxCu1Nb3Si13.5B9 (x = 0, 10, 20, and 30) alloys has been investigated. It has been revealed that a thermomagnetic treatment in a dc magnetic field of the nanocrystalline alloys containing cobalt leads to a shift of their hysteresis loop. With increasing Co content in the alloy, the shift of the hysteresis loop increases. This fact is, apparently, connected with the precipitation of alpha-Co and beta-Co clusters and (FA,Co)(3)Si and (Fe, Co)(2)B nanophases in which the magnetization direction is determined by the direction of the magnetic field during treatment.