We present an experimental model system that enables quantitative assessment of
intergranular exchange coupling in CoCrPt-oxide perpendicular magnetic recording media.
A thin film structure consisting of a high coercivity CoPt unicrystal layer and a lower
coercivity CoPt layer separated by a thin oxide interlayer is used to model perpendicularly
magnetized grains separated by oxide grain boundaries. Exchange coupling energy
between the CoPt layers was obtained for SiO x⁠, TiO x⁠, and CrO x interlayers by …