Mn doping effect on structure and magnetism of epitaxial (FePt)1-xMnx films

We study the structure and perpendicular magnetism of molecular beam epitaxy grown (FePt)(1-x)Mn-x films with doping concentration x=0, 1%, 2%, 3%, 4%, and 5%. The (FePt)(1-x)Mn-x films were made by multilayers growth of [Fe/Pt/Mn]xN at 100 degreesC and annealed at 600 degreesC. X-ray diffraction scans indicate that relatively better L1(0) ordered structure for low Mn doping (x<2%). The (001) and (003) superstructure peaks decrease with the increase of the Mn doping for x≥2%, and a significant (111) peak appears for x>3%. The perpendicular magnetic anisotropy effect of the (FePt)(1-x)Mn-x films tends to decrease with the increase of Mn doping for x>1%. However, the x=1% doped films possess slightly better perpendicular magnetic anisotropy effect than the zero doped film. The perpendicular magnetic anisotropy constant are of about 1.3x10(7) and 1.6x10(7) erg/cm(3) for x=0% and x=1%, respectively. (C) 2003 American Institute of Physics.