Low Noise Co/Pd Multilayer Media for Perpendicular Magnetic Recording

Read-write tests and magnetic force microscopy (MFM) observations have been performed for Co/Pd multilayer perpendicular magnetic recording media. For a Co/Pd multilayer medium with a nucleation field ([H.sub.n]) of-1.5 kOe and a small slope at coercivity (He), no reversed magnetic domains between the transitions were observed and a low medium noise was also obtained. Moreover, a negligible time decay in magnetization was detected at the remanent state as well as in signals at both low and high recording densities. Index Terms--Co/Pd multilayer media, perpendicular magnetic recording, reversed magnetic domains, medium noise.