Abstract
We substituted 3d transition elements M (M=Ni, Fe, Cr, and Mn) for some of the Co, or Pd for some of the Pt, in L11-type Co50Pt50 ordered alloy perpendicular films, and studied magnetic and structural properties. Films were fabricated at a substrate temperature of 360oC using ultra-high vacuum (UHV) sputter film deposition. The order parameter S was almost a constant of about 0.5 when Ni was substituted for some of the Co. The uniaxial magnetic anisotropy Ku and the saturation magnetization, Ms, decreased as the Ni content increased, however, Ku maintained a relatively large value of 1.8x107 erg/cm3 (Ms=570 emu/cm3) even for a Co20Ni30Pt50 composition. In the substitutions of Fe for some of the Co, or Pd for some of the Pt, no significant variation in Ms was observed, however, the rate of decrease of Ku on increasing the Fe or Pd content was larger than when Ni was substituted. The substitution of Cr or Mn for some Co resulted in significant reductions in S, Ms and Ku. Experimental results showed the potential of Co-Ni-Pt ordered films for use in data storage applications, due to their very high Ku potential, relatively low Ms, the relatively low fabrication temperature, and good controllability of the grain orientation.
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