Magnetic properties and temperature stability of a molybdenum-doped Finemet-type alloy

The influence of nanocrystallization conditions on the structure, magnetic properties, and temperature stability of nanocrystalline magnetically soft Fe$_{73.5}$Cu$_1$Nb$_{1.5}$Mo$_{1.5}$Si$_{13.5}$B$_9$ alloy is studied. It is found that preliminary low-temperature annealing exerts an influence on subsequent nanocrystallization of the alloy. In addition, preannealing followed by nanocrystallization considerably improves the magnetic properties of the alloy. It is shown that the magnetic properties of the material can be controlled by varying the frequency of a magnetic field used for thermal treatment causing nanocrystallization. It is established that the magnetic properties of nanocrystalline Fe$_{73.5}$Cu$_1$Nb$_{1.5}$Mo$_{1.5}$Si$_{13.5}$B$_9$ alloy offer a high temperature stability.