Introducing and investigating structural and magnetic properties of ribbons Co68.5-xFe4WxSi16.5B11 (x = 0.8, 2) in amorphous and crystalline states

In this study, for the first time, cobalt base ribbons were made by adding two different amounts of tungsten with Co67.7Fe4W0.8Si16.5B11 and Co66.5Fe4W2 Si16.5B11 compounds by melt spinning in the water. The pattern of  X-ray diffraction taken from these ribbons shows that these magnetic ribbons are amorphous. By using thermal analysis curves, taken from the ribbons, crystallization temperature, enthalpy, and specific heat capacity were calculated and compared. The magnetic properties of the ribbons, the Curie temperature and magnetostriction, and the hardness of the ribbons were measured by microscopic testing. The results indicate that the ribbons are soft ferromagnetic. The magnetic properties of the ribbons have been investigated by annealing the ribbons at a temperature higher than the crystalline temperature. The diffraction pattern taken from these ribbons shows that the ribbons aren’t amorphous and crystallized from annealed in a temperature above the crystalline temperature. Due to crystallinity, the magnetic anisotropy appeared in the specimen and changed the properties of the ribbons from soft ferromagnetism to hard ferromagnetism. These results are justified by the magnetic moment and the atomic radius of cobalt and tungsten.