The effects of additive metals ( Nb, Ta, Zr and Pt ) on properties of Co-Cr alloy thin film media have been studied. It was found that perpendicular coercivities ( Hc⊥) decreased monotonically with increasing Zr addition , while Hc⊥ increased and exhibited a maximum value with the addition of 3-4at.% of Nb or Ta and about 12at.% of Pt. Further addition of Pt seemed to decrease the degree of magnetic isolation between particles. Nb addition provided a higher saturation magnetization (Ms) at the maximum value of Hc⊥ than that of Ta addition. The effects of simultaneous addition of Nb, Ta and Zr are also described.
