Ferromagnetic resonance investigation of magnetism in Fe-rich sputtered amorphous alloys

摘要: Fe-rich alloys in the Ti concentration range have been successfully prepared amorphous state for first time using DC co-sputtering method. Exhaustive ferromagnetic resonance (FMR) measurements were performed on these at a fixed microwave-field frequency of about 9.23 GHz temperature 77 - 300 K. In this range, single is observed with x = 10 and 11 as against two resonances (primary secondary), having different properties, case a-. For primary (single) a- (the 11), `in-plane' uniaxial anisotropy field scales saturation magnetization . This result suggests that energy dipolar origin. By contrast, relation breaks down secondary resonance. The thus characterize distinctly magnetic phases which widely differ their chemical well geometrical short-range orders. all question, thermal demagnetization mainly due to spin-wave (SW) excitations, SW stiffness D decreases increasing x. modes soften so-called re-entrant transition temperature) possesses reduced value existence low temperatures also vindicated by rapid increase magnitude peak-to-peak FMR linewidth below certain temperature. an upturn occurs shifts lower Fe decreased, indicating behaviour progressively suppressed