Effect of interface on microstructure and soft magnetic properties of Fe65 Co35 thin films

Bilayer films with Fe-65 Co-35 main layer/underlayer structure were successfully prepared by magnetron sputtering on different underlayers (Co-93 Fe-7 and Fe). X-ray diffraction (XRD) analysis and magnetic measurements show that Fe-65 Co-35 thin films deposited on different underlayers have different textures. Moreover, the soft magnetic properties of Fe-65 Co-35 thin films with (200) texture are better than that of Fe-65 Co-35 thin films with (110) texture. Investigation of several typical samples by conversion electron Mossbauer spectrum (CEMS) reveals that the vector of magnetization of Fe-65 Co-35 thin films have a little deviation from the film plane, and the deviation from the film plane of Fe-65 Co-35 thin films with (110) texture are bigger than that of Fe-65 Co-35 thin films with (200) texture. Further study exhibits that this phenomenon is caused by the interface anisotropy induced by magnetoelastic anisotropy at the interface between Fe-65 Co-35 thin film and underlayer.