Magnetic and reversal properties of HCP-CoCrPt:C granular films with CrTi underlayer

Abstract Studies on the HCP-CoCrPt : C granular films reveal that the evolution of film magnetic and reversal properties as a function of annealing temperature and carbon content is closely correlated with the segregation or diffusion of C and Cr atoms into the grain boundaries. The magnetic moment lies well within the film plane for all studied films and the film with high coercivity of 4.4 kOe and anisotropy of 3.6×10 6 erg/cm 3 has been obtained. An approach to measure the thermal stability factor ( K u V */ k B T ), magnetic switching volume V * and film anisotropy K u in one set of “moment-decay” measurements has been developed, and the annealing and carbon content effects on these reversal properties have been analyzed systematically. The HCP-CoCrPt : C granular film is a promising candidate for an ultra-high-density recording media up to 100 Gbit/in 2 or beyond because of its low Pt content, desirable properties and the possible benefits from the rich knowledge of current HCP-textured Co-alloy rigid disks.