We developed L11-type Co-Ni-Pt ordered alloy films for use as a material for creating thermally assisted magnetic recording media with high recording densities. We examined the temperature dependence of magnetic properties of L11-type (Co1-xNi x)50Pt50 ordered alloy films. These films had a uniaxial magnetic anisotropy of 107 erg/cm3 at an x of less than ∼ 0.8. The Curie point was monotonously reduced when the Ni content steadily increased. The composition of Co15Ni 35Pt50 (x =0.7) provided both a high magnetic anisotropy of 1.4×107 erg/cm3 and a low Curie point of 583 K, which are favorable for thermally assisted magnetic recording media.