Magnetic permeability of [(FeCoGe).sub.88][Zr.sub.6][B.sub.5][Cu.sub.1] alloys: thermal stability in a wide temperature range

The thermal dependence of the initial permeability ([mu]) from room temperature up to 1000 K is analyzed as a function of microstructure for two Ge and Co containing Nanoperm alloys. The studies have shown that as the nanocrystallization has progressed, the room temperature [mu] has decreased but high temperature one has increased, thus leading to an improvement of its thermal stability.