Thermal stability of magnetic properties of amorphous and nanocrystalline Fe/sub 85.4-x/Co/sub x/Zr/sub 5.8/Nb/sub 1/B/sub 6.8/Cu/sub 1/ (x=0 or 42.7) alloys

Summary form only given. The authors present the results of investigations of the microstructure and magnetic properties of amorphous and nanocrystalline alloys. The microstructure of the samples was investigated by X-ray diffractometry, Mossbauer spectroscopy and transmission electron microscopy. The magnetic susceptibility, its disaccommodation and core losses were measured for toroidal samples using a completely automated set-up. The saturation magnetization was studied by a force magnetometer. All investigations were carried out for the samples subjected to the annealing at 573 K for 1 h and subsequently at 723 K for 10, 40 and 70 min and at 800 K for 5 and 30 min.