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We report two effects that lead to a reduction of the switching fielddistribution in exchange spring media. The first effect relies on a subtlemechanism of the interplay between exchange coupling between soft and hardlayers and anisotropy that allows significant reduction of the switching fielddistribution in exchange spring media. This effect reduces the switching fielddistribution by about 30% compared to single-phase media. A second effect isthat due to the improved thermal stability of exchange spring media oversingle-phase media, thermal fluctuation leads to reduced fundamental transitionjitter. The influence of this overall improved switching field distribution onthe transition jitter in granular recording and the bit error rate inbit-patterned magnetic recording is discussed. The transition jitter ingranular recording for a distribution of K1 values of 3% in the hard layer,taking into account thermal fluctuations during recording, is estimated to be a= 0.78 nm, which is similar to the best reported calculated jitter in optimizedheat-assisted recording media.

Superior bit error rate and jitter due to improved switching field distribution in exchange spring magnetic recording