Co Cr Pt – Si O 2 granular-type longitudinal media on Ru underlayer for sputtered tape applications

Abstract

CoCrPt-SiO 2 films for use as thin film tape media have been investigated. Bias sputtering and high Ar pressure were utilized to achieve desirable media properties ͑good in-plane orientation and enhanced grain decoupling͒ in these media. The in-plane orientation of the bias sputtered CoCrPt-SiO 2 magnetic layer was well maintained even at a high content of SiO 2 as Ru was used as an underlayer and deposited at high Ar pressure. Films of ͑10.0͒ textured CoCrPt-SiO 2 on a Ru underlayer showed a large in-plane coercivity of 4000 Oe and transmission electron microscopy revealed an average grain size of about 10 nm, well decoupled by the oxide. The in-plane coercivity was a strong function of the Ru thickness.

The Influences of Ru Seed Layer Microstructure on Structural Properties of CoCrPt-SiO₂ Perpendicular Media

“…Low media noise are crucial properties to perpendicular media, and grain isolation is important to improve media noise performance, CoCrPt-SiO 2 perpendicular films which have very fine grains with nonmagnetic SiO 2 at the grain boundary effectively decrease inter-granular exchange coupling to achieve low media noise and high perpendicular anisotropy, thus CoCrPt-SiO 2 granular film is well known as a perpendicular magnetic recording(PMR) media. In CoCrPt-SiO 2 granular-type perpendicular magnetic recording media, Ru is used as an underlayer to induce perpendicular anisotropy of the recording layer due to heteroepitaxial relationship between Ru (002) and CoCrPt (002) [5][6][7][8].…”