High-coercivity CoCrPt-Ti perpendicular media by in situ interdiffusion of CrMn ultrathin overlayers

We have investigated the magnetic and structural properties of CoCrPt perpendicular films with respect to in situ interdiffusion of CrMn from top layers. We have observed a coercivity of 5700 Oe in films with a thin CrMn overlayer, which is greater than two times larger than similar type of films without a CrMn overlayer. This increment is attributed to the decoupling of grains by diffusion of CrMn from top layer through the grain boundaries.