Thermal stability of the induced magnetic anisotropy and structure of the nanocrystalline alloy FeCuNbSiB

The magnetic anisotropy induced in the ribbons of the Fe 73.5Cu 1Nb 3Si 13.5B 9 alloy in the course of stress annealing combined with the nanocrystallising one was investigated. Crystalline phases formed during the above treatments were studied by the Mössbauer method. Analysis of the Mössbauer results showed that the content of the Fe–Si phases depends neither on the exposure time nor on the value of the induced magnetic anisotropy constant. At the same time, in the regions containing, along with Fe, Nb and B the process of redistributing the elements proceeds with time, and the deeper the process, the higher the thermal stability of the induced magnetic anisotropy.